Java 当我更改按钮/文本视图中除文本以外的所有内容时，应用程序停止

我用了两本Android书籍和Android studio来学习这本书，但现在我被卡住了。 如果我试图更改.clickable（false）、.setenabled（false）甚至Java中的颜色，我的程序就会停止。它在我实施的每一个噱头上都能流畅地运行，但如果我尝试启用（第一状态禁用）复选框/按钮，当有人单击“开始按钮”时，我的应用程序就会关闭

<TextView
    android:id="@+id/examchoosen"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.983"
    app:layout_constraintHorizontal_bias="0.92" />

<Button
    android:id="@+id/counter"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAllCaps="false"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="8dp"
    app:layout_constraintVertical_bias="0.982" />

<TextView
    android:id="@+id/countdown"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.016"
    app:layout_constraintHorizontal_bias="0.501" />

<TextView
    android:id="@+id/frage"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="42dp"
    app:layout_constraintHorizontal_bias="0.065"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="8dp"
    app:layout_constraintVertical_bias="0.022" />

<TextView
    android:id="@+id/subfrage1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="84dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="101dp"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginTop="118dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintTop_toTopOf="parent" />

<TextView
    android:id="@+id/subfrage4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="135dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage5"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="152dp" />

<TextView
    android:id="@+id/subfrage6"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="169dp" />

<TextView
    android:id="@+id/subfrage7"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="186dp" />

<TextView
    android:id="@+id/subfrage8"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="203dp" />

<TextView
    android:id="@+id/subfrage9"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="220dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage10"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="237dp" />

<TextView
    android:id="@+id/AntwortA"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="273dp" />

<TextView
    android:id="@+id/AntwortB"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="290dp" />

<TextView
    android:id="@+id/AntwortC"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="307dp" />

<TextView
    android:id="@+id/AntwortD"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="325dp" />

<TextView
    android:id="@+id/AntwortE"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="342dp" />

<TextView
    android:id="@+id/AntwortF"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="359dp" />

<TextView
    android:id="@+id/AntwortG"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="376dp" />

<TextView
    android:id="@+id/AntwortH"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="393dp" />

<TextView
    android:id="@+id/AntwortI"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="410dp" />

<TextView
    android:id="@+id/AntwortJ"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="427dp" />

<CheckBox
    android:id="@+id/BoxA"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="206dp" />

<CheckBox
    android:id="@+id/BoxB"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="189dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"

    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxC"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="172dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxD"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="155dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxE"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="137dp"
    app:layout_constraintHorizontal_bias="0.113" />

<CheckBox
    android:id="@+id/BoxF"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="120dp"
    app:layout_constraintHorizontal_bias="0.023" />

<CheckBox
    android:id="@+id/BoxG"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="103dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxH"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="86dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxI"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="69dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxJ"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="52dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

</android.support.constraint.ConstraintLayout>

关于文本视图和复选框数量的注意事项：我将签出main函数，并在1.0中使用objectarray滚动活动。atm所有这些文本视图只是为了让我知道这个应用程序有多大。这是一个关于健康和医学的测验。可能有1个问题、10个子问题和10个答案，或者有1个问题、0个子问题和2个答案。每次考试大约有60道题。但我不能这样做，因为当我禁用一个复选框或设置可设置性（false）时，我的应用程序停止

<TextView
    android:id="@+id/examchoosen"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.983"
    app:layout_constraintHorizontal_bias="0.92" />

<Button
    android:id="@+id/counter"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAllCaps="false"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="8dp"
    app:layout_constraintVertical_bias="0.982" />

<TextView
    android:id="@+id/countdown"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.016"
    app:layout_constraintHorizontal_bias="0.501" />

<TextView
    android:id="@+id/frage"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="42dp"
    app:layout_constraintHorizontal_bias="0.065"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="8dp"
    app:layout_constraintVertical_bias="0.022" />

<TextView
    android:id="@+id/subfrage1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="84dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="101dp"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginTop="118dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintTop_toTopOf="parent" />

<TextView
    android:id="@+id/subfrage4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="135dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage5"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="152dp" />

<TextView
    android:id="@+id/subfrage6"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="169dp" />

<TextView
    android:id="@+id/subfrage7"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="186dp" />

<TextView
    android:id="@+id/subfrage8"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="203dp" />

<TextView
    android:id="@+id/subfrage9"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="220dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage10"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="237dp" />

<TextView
    android:id="@+id/AntwortA"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="273dp" />

<TextView
    android:id="@+id/AntwortB"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="290dp" />

<TextView
    android:id="@+id/AntwortC"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="307dp" />

<TextView
    android:id="@+id/AntwortD"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="325dp" />

<TextView
    android:id="@+id/AntwortE"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="342dp" />

<TextView
    android:id="@+id/AntwortF"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="359dp" />

<TextView
    android:id="@+id/AntwortG"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="376dp" />

<TextView
    android:id="@+id/AntwortH"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="393dp" />

<TextView
    android:id="@+id/AntwortI"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="410dp" />

<TextView
    android:id="@+id/AntwortJ"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="427dp" />

<CheckBox
    android:id="@+id/BoxA"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="206dp" />

<CheckBox
    android:id="@+id/BoxB"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="189dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"

    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxC"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="172dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxD"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="155dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxE"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="137dp"
    app:layout_constraintHorizontal_bias="0.113" />

<CheckBox
    android:id="@+id/BoxF"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="120dp"
    app:layout_constraintHorizontal_bias="0.023" />

<CheckBox
    android:id="@+id/BoxG"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="103dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxH"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="86dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxI"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="69dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxJ"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="52dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

</android.support.constraint.ConstraintLayout>

我的建议是：

<TextView
    android:id="@+id/examchoosen"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.983"
    app:layout_constraintHorizontal_bias="0.92" />

<Button
    android:id="@+id/counter"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAllCaps="false"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="8dp"
    app:layout_constraintVertical_bias="0.982" />

<TextView
    android:id="@+id/countdown"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.016"
    app:layout_constraintHorizontal_bias="0.501" />

<TextView
    android:id="@+id/frage"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="42dp"
    app:layout_constraintHorizontal_bias="0.065"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="8dp"
    app:layout_constraintVertical_bias="0.022" />

<TextView
    android:id="@+id/subfrage1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="84dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="101dp"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginTop="118dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintTop_toTopOf="parent" />

<TextView
    android:id="@+id/subfrage4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="135dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage5"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="152dp" />

<TextView
    android:id="@+id/subfrage6"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="169dp" />

<TextView
    android:id="@+id/subfrage7"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="186dp" />

<TextView
    android:id="@+id/subfrage8"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="203dp" />

<TextView
    android:id="@+id/subfrage9"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="220dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage10"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="237dp" />

<TextView
    android:id="@+id/AntwortA"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="273dp" />

<TextView
    android:id="@+id/AntwortB"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="290dp" />

<TextView
    android:id="@+id/AntwortC"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="307dp" />

<TextView
    android:id="@+id/AntwortD"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="325dp" />

<TextView
    android:id="@+id/AntwortE"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="342dp" />

<TextView
    android:id="@+id/AntwortF"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="359dp" />

<TextView
    android:id="@+id/AntwortG"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="376dp" />

<TextView
    android:id="@+id/AntwortH"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="393dp" />

<TextView
    android:id="@+id/AntwortI"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="410dp" />

<TextView
    android:id="@+id/AntwortJ"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="427dp" />

<CheckBox
    android:id="@+id/BoxA"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="206dp" />

<CheckBox
    android:id="@+id/BoxB"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="189dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"

    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxC"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="172dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxD"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="155dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxE"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="137dp"
    app:layout_constraintHorizontal_bias="0.113" />

<CheckBox
    android:id="@+id/BoxF"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="120dp"
    app:layout_constraintHorizontal_bias="0.023" />

<CheckBox
    android:id="@+id/BoxG"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="103dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxH"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="86dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxI"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="69dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxJ"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="52dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

</android.support.constraint.ConstraintLayout>

• 在xml文件中打开“getCurentState（）”方法
• 创建一个包含一个“true”和一个“false”变量的新xml文件，并在主xml文档setclickable=“@…/currentState”中引用它们
• ivé听说过xsl，但怎么听说的D

XML文件：

<TextView
    android:id="@+id/examchoosen"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.983"
    app:layout_constraintHorizontal_bias="0.92" />

<Button
    android:id="@+id/counter"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAllCaps="false"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="8dp"
    app:layout_constraintVertical_bias="0.982" />

<TextView
    android:id="@+id/countdown"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.016"
    app:layout_constraintHorizontal_bias="0.501" />

<TextView
    android:id="@+id/frage"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="42dp"
    app:layout_constraintHorizontal_bias="0.065"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="8dp"
    app:layout_constraintVertical_bias="0.022" />

<TextView
    android:id="@+id/subfrage1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="84dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="101dp"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginTop="118dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintTop_toTopOf="parent" />

<TextView
    android:id="@+id/subfrage4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="135dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage5"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="152dp" />

<TextView
    android:id="@+id/subfrage6"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="169dp" />

<TextView
    android:id="@+id/subfrage7"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="186dp" />

<TextView
    android:id="@+id/subfrage8"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="203dp" />

<TextView
    android:id="@+id/subfrage9"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="220dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage10"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="237dp" />

<TextView
    android:id="@+id/AntwortA"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="273dp" />

<TextView
    android:id="@+id/AntwortB"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="290dp" />

<TextView
    android:id="@+id/AntwortC"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="307dp" />

<TextView
    android:id="@+id/AntwortD"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="325dp" />

<TextView
    android:id="@+id/AntwortE"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="342dp" />

<TextView
    android:id="@+id/AntwortF"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="359dp" />

<TextView
    android:id="@+id/AntwortG"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="376dp" />

<TextView
    android:id="@+id/AntwortH"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="393dp" />

<TextView
    android:id="@+id/AntwortI"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="410dp" />

<TextView
    android:id="@+id/AntwortJ"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="427dp" />

<CheckBox
    android:id="@+id/BoxA"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="206dp" />

<CheckBox
    android:id="@+id/BoxB"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="189dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"

    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxC"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="172dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxD"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="155dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxE"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="137dp"
    app:layout_constraintHorizontal_bias="0.113" />

<CheckBox
    android:id="@+id/BoxF"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="120dp"
    app:layout_constraintHorizontal_bias="0.023" />

<CheckBox
    android:id="@+id/BoxG"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="103dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxH"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="86dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxI"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="69dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxJ"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="52dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

</android.support.constraint.ConstraintLayout>

Java文件：

<TextView
    android:id="@+id/examchoosen"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.983"
    app:layout_constraintHorizontal_bias="0.92" />

<Button
    android:id="@+id/counter"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAllCaps="false"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="8dp"
    app:layout_constraintVertical_bias="0.982" />

<TextView
    android:id="@+id/countdown"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.016"
    app:layout_constraintHorizontal_bias="0.501" />

<TextView
    android:id="@+id/frage"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="42dp"
    app:layout_constraintHorizontal_bias="0.065"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="8dp"
    app:layout_constraintVertical_bias="0.022" />

<TextView
    android:id="@+id/subfrage1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="84dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="101dp"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginTop="118dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintTop_toTopOf="parent" />

<TextView
    android:id="@+id/subfrage4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="135dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage5"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="152dp" />

<TextView
    android:id="@+id/subfrage6"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="169dp" />

<TextView
    android:id="@+id/subfrage7"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="186dp" />

<TextView
    android:id="@+id/subfrage8"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="203dp" />

<TextView
    android:id="@+id/subfrage9"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="220dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage10"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="237dp" />

<TextView
    android:id="@+id/AntwortA"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="273dp" />

<TextView
    android:id="@+id/AntwortB"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="290dp" />

<TextView
    android:id="@+id/AntwortC"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="307dp" />

<TextView
    android:id="@+id/AntwortD"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="325dp" />

<TextView
    android:id="@+id/AntwortE"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="342dp" />

<TextView
    android:id="@+id/AntwortF"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="359dp" />

<TextView
    android:id="@+id/AntwortG"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="376dp" />

<TextView
    android:id="@+id/AntwortH"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="393dp" />

<TextView
    android:id="@+id/AntwortI"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="410dp" />

<TextView
    android:id="@+id/AntwortJ"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="427dp" />

<CheckBox
    android:id="@+id/BoxA"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="206dp" />

<CheckBox
    android:id="@+id/BoxB"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="189dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"

    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxC"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="172dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxD"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="155dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxE"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="137dp"
    app:layout_constraintHorizontal_bias="0.113" />

<CheckBox
    android:id="@+id/BoxF"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="120dp"
    app:layout_constraintHorizontal_bias="0.023" />

<CheckBox
    android:id="@+id/BoxG"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="103dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxH"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="86dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxI"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="69dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxJ"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="52dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

</android.support.constraint.ConstraintLayout>

package de.isolde_richter.hp_pruefer_00;

import android.os.CountDownTimer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.TextView;

public class examenExaminer extends AppCompatActivity {




TextView frage;
TextView subfrage1;
TextView subfrage2;
TextView subfrage3;
TextView subfrage4;
TextView subfrage5;
TextView subfrage6;
TextView subfrage7;
TextView subfrage8;
TextView subfrage9;
TextView subfrage10;
TextView antwortA;
TextView antwortB;
TextView antwortC;
TextView antwortD;
TextView antwortE;
TextView antwortF;
TextView antwortG;
TextView antwortH;
TextView antwortI;
TextView antwortJ;
CheckBox BoxA;
CheckBox BoxB;
CheckBox BoxC;
CheckBox BoxD;
CheckBox BoxE;
CheckBox BoxF;
CheckBox BoxG;
CheckBox BoxH;
CheckBox BoxI;
CheckBox BoxJ;
TextView examchoosen;
Button counter;
TextView countdown;
CountDownTimer counterTimer;
@Override
protected void onCreate(Bundle savedInstanceState) {
    frage = (TextView) findViewById(R.id.frage);
    subfrage1 = (TextView) findViewById(R.id.subfrage1);
    subfrage2 = (TextView) findViewById(R.id.subfrage2);
    subfrage3 = (TextView) findViewById(R.id.subfrage3);
    subfrage4 = (TextView) findViewById(R.id.subfrage4);
    subfrage5 = (TextView) findViewById(R.id.subfrage5);
    subfrage6 = (TextView) findViewById(R.id.subfrage6);
    subfrage7 = (TextView) findViewById(R.id.subfrage7);
    subfrage8 = (TextView) findViewById(R.id.subfrage8);
    subfrage9 = (TextView) findViewById(R.id.subfrage9);
    subfrage10 = (TextView) findViewById(R.id.subfrage10);
    antwortA=(TextView) findViewById(R.id.AntwortA);
    antwortB=(TextView) findViewById(R.id.AntwortB);
    antwortC=(TextView) findViewById(R.id.AntwortC);
    antwortD=(TextView) findViewById(R.id.AntwortD);
    antwortE=(TextView) findViewById(R.id.AntwortE);
    antwortF=(TextView) findViewById(R.id.AntwortF);
    antwortG=(TextView) findViewById(R.id.AntwortG);
    antwortH=(TextView) findViewById(R.id.AntwortH);
    antwortI=(TextView) findViewById(R.id.AntwortI);
    antwortJ=(TextView) findViewById(R.id.AntwortJ);
    BoxA =(CheckBox)findViewById(R.id.BoxA);
    BoxB =(CheckBox)findViewById(R.id.BoxB);
    BoxC =(CheckBox)findViewById(R.id.BoxC);
    BoxD =(CheckBox)findViewById(R.id.BoxD);
    BoxE =(CheckBox)findViewById(R.id.BoxE);
    BoxF =(CheckBox)findViewById(R.id.BoxF);
    BoxG =(CheckBox)findViewById(R.id.BoxG);
    BoxH =(CheckBox)findViewById(R.id.BoxH);
    BoxI =(CheckBox)findViewById(R.id.BoxI);
    BoxJ =(CheckBox)findViewById(R.id.BoxJ);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_examen_examiner);
    examchoosen = (TextView) findViewById(R.id.examchoosen);
    counter = (Button) findViewById(R.id.counter);
    countdown = (TextView) findViewById(R.id.countdown);
    countdown.setText("(120M:00S)");
    counter.setText(R.string.rdy);

    counterTimer = new CountDownTimer(7200000,100) {
        @Override
        public void onTick(long l) {

            Long totals =(l/100)/10;
            Long m = totals/60;
            Long s = totals%60;
            //countdown.setText(""+m+"M:"+s+"S");



            if(m>=10 && s >=10){
                countdown.setText("("+m+"M:"+s+"S)"); //bsp 1 = (10M:10S)
            }  else if (m < 10 && s >=10) {
                countdown.setText("(0"+m+"M:"+s+"S)");  //bsp 2 =    (09M:10S)
            } else if (m < 10  && s < 10) {
                countdown.setText("(0"+ m+"M:0"+s+"S)"); //bsp 3 (09M:09S)
            } else if (m == 0 && s<10){
                countdown.setText("(00M:0"+s+"S)");//bsp 5 (00M:09S)
            }  else if (m >= 10 && s < 10){
                countdown.setText("("+m+"M:0"+s+"S)"); //bsp 1 = (10M:09S)
            }
        }

        @Override
        public void onFinish() {
            countdown.setText("(00M:00S)");
            counter.setText("Fertig");
        }
    };

    counter.setOnClickListener(new View.OnClickListener(){
        private boolean startExam=false;
        @Override
        public void onClick(View w){
            //wenn der button geklickt wird
            //if the button gets clicked
            if(startExam==false) {
                counter.setText(R.string.next); // <- Works
                counterTimer.start();
                startExam = true;
            }
        }
    });


}
}

package de.isolde\u richter.hp\u pruefer\u 00；
导入android.os.CountDownTimer；
导入android.support.v7.app.AppActivity；
导入android.os.Bundle；
导入android.view.view；
导入android.widget.Button；
导入android.widget.CheckBox；
导入android.widget.TextView；
公开课examenExaminer活动{
TextView frage；
文本视图子片段1；
文本视图子片段2；
文本视图子片段3；
TextView子片段4；
文本视图子片段5；
文本视图子片段6；
文本视图子片段7；
文本视图子片段8；
文本视图子片段9；
文本视图子片段10；
文本视图蚂蚁；
文本视图；
文本视图antwortC；
文本视图antwortD；
蚁草；
文本视图antwortF；
文本视图antwortG；
TextView-antwortH；
文本视图蚂蚁；
TextView antwortJ；
复选框A；
复选框B；
复选框c；
复选框D；
复选框；
复选框框f；
复选框框g；
复选框H；
复选框BoxI；
复选框j；
TextView-examchoosen；
按钮计数器；
文本视图倒计时；
倒计时计数器；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
frage=（TextView）findViewById（R.id.frage）；
subfrage1=（TextView）findViewById（R.id.subfrage1）；
subfrage2=（TextView）findViewById（R.id.subfrage2）；
subfrage3=（TextView）findViewById（R.id.subfrage3）；
subfrage4=（TextView）findViewById（R.id.subfrage4）；
subfrage5=（TextView）findViewById（R.id.subfrage5）；
subfrage6=（TextView）findViewById（R.id.subfrage6）；
subfrage7=（TextView）findViewById（R.id.subfrage7）；
subfrage8=（TextView）findViewById（R.id.subfrage8）；
subfrage9=（TextView）findViewById（R.id.subfrage9）；
子片段10=（文本视图）findViewById（R.id.sub片段10）；
antwortA=（TextView）findViewById（R.id.antwortA）；
antwortB=（TextView）findViewById（R.id.antwortB）；
antwortC=（TextView）findViewById（R.id.antwortC）；
antwortD=（TextView）findViewById（R.id.antwortD）；
antwortE=（TextView）findViewById（R.id.antwortE）；
antwortF=（TextView）findViewById（R.id.antwortF）；
antwortG=（TextView）findViewById（R.id.antwortG）；
antwortH=（TextView）findViewById（R.id.antwortH）；
antwortI=（TextView）findViewById（R.id.antwortI）；
antwortJ=（TextView）findViewById（R.id.antwortJ）；
BoxA=（复选框）findviewbyd（R.id.BoxA）；
BoxB=（复选框）findViewById（R.id.BoxB）；
BoxC=（复选框）findViewById（R.id.BoxC）；
BoxD=（复选框）findviewbyd（R.id.BoxD）；
BoxE=（复选框）findviewbyd（R.id.BoxE）；
BoxF=（复选框）findviewbyd（R.id.BoxF）；
BoxG=（复选框）findviewbyd（R.id.BoxG）；
BoxH=（复选框）findviewbyd（R.id.BoxH）；
BoxI=（复选框）findviewbyd（R.id.BoxI）；
BoxJ=（复选框）findviewbyd（R.id.BoxJ）；
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity\u Examimen\u examiner）；
examchoosen=（TextView）findViewById（R.id.examchoosen）；
计数器=（按钮）findViewById（R.id.counter）；
倒计时=（文本视图）findViewById（R.id.countdown）；
倒数.setText（“（120M:00S）”）；
counter.setText（R.string.rdy）；
计数器=新的倒计时（7200000100）{
@凌驾
公共空白条（长l）{
长期总计=（l/100）/10；
长m=总计/60；
长s=总计%60；
//倒计时.setText（“+m+”m:“+s+”s”）；
如果（m>=10&&s>=10）{
倒计时.setText（（“+m+”m:+s+“s）”）；//bsp 1=（10M:10S）
}否则如果（m<10&&s>=10）{
倒计时.setText（（（0“+m+”m:+s+“s）”）；//bsp 2=（09M:10S）
}否则如果（m<10和s<10）{
倒计时.setText（“（0”+m+“m:0”+s+“s）”）；//bsp 3（09M:09S）
}如果（m==0&&s=10&&s<10），则为else{
倒计时.setText（（“+m+”m:0“+s+”s）”）；//BSP1=（10M:09S）
}
}
@凌驾
公共无效onFinish（）{
倒数计时.setText（“（00M:00S）”）；
counter.setText（“Fertig”）；
}
};
counter.setOnClickListener（新视图.OnClickListener（）{
私有布尔startExam=false；
@凌驾
公共void onClick（视图w）{
//带按钮的按钮
//如果按钮被点击
如果（startExam==false）{
counter.setText（R.string.next）；//如果有人遇到这个问题，这应该会对您有所帮助，在我的例子中，它是有效的。
而不是

<TextView
    android:id="@+id/examchoosen"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.983"
    app:layout_constraintHorizontal_bias="0.92" />

<Button
    android:id="@+id/counter"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAllCaps="false"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="8dp"
    app:layout_constraintVertical_bias="0.982" />

<TextView
    android:id="@+id/countdown"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.016"
    app:layout_constraintHorizontal_bias="0.501" />

<TextView
    android:id="@+id/frage"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="42dp"
    app:layout_constraintHorizontal_bias="0.065"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="8dp"
    app:layout_constraintVertical_bias="0.022" />

<TextView
    android:id="@+id/subfrage1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="84dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="101dp"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginTop="118dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintTop_toTopOf="parent" />

<TextView
    android:id="@+id/subfrage4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="135dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage5"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="152dp" />

<TextView
    android:id="@+id/subfrage6"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="169dp" />

<TextView
    android:id="@+id/subfrage7"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="186dp" />

<TextView
    android:id="@+id/subfrage8"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="203dp" />

<TextView
    android:id="@+id/subfrage9"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="220dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage10"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="237dp" />

<TextView
    android:id="@+id/AntwortA"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="273dp" />

<TextView
    android:id="@+id/AntwortB"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="290dp" />

<TextView
    android:id="@+id/AntwortC"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="307dp" />

<TextView
    android:id="@+id/AntwortD"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="325dp" />

<TextView
    android:id="@+id/AntwortE"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="342dp" />

<TextView
    android:id="@+id/AntwortF"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="359dp" />

<TextView
    android:id="@+id/AntwortG"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="376dp" />

<TextView
    android:id="@+id/AntwortH"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="393dp" />

<TextView
    android:id="@+id/AntwortI"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="410dp" />

<TextView
    android:id="@+id/AntwortJ"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="427dp" />

<CheckBox
    android:id="@+id/BoxA"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="206dp" />

<CheckBox
    android:id="@+id/BoxB"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="189dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"

    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxC"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="172dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxD"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="155dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxE"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="137dp"
    app:layout_constraintHorizontal_bias="0.113" />

<CheckBox
    android:id="@+id/BoxF"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="120dp"
    app:layout_constraintHorizontal_bias="0.023" />

<CheckBox
    android:id="@+id/BoxG"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="103dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxH"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="86dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxI"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="69dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxJ"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="52dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

</android.support.constraint.ConstraintLayout>

  listview.setVisibility(true);

这样做：

<TextView
    android:id="@+id/examchoosen"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.983"
    app:layout_constraintHorizontal_bias="0.92" />

<Button
    android:id="@+id/counter"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAllCaps="false"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="8dp"
    app:layout_constraintVertical_bias="0.982" />

<TextView
    android:id="@+id/countdown"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.016"
    app:layout_constraintHorizontal_bias="0.501" />

<TextView
    android:id="@+id/frage"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="42dp"
    app:layout_constraintHorizontal_bias="0.065"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="8dp"
    app:layout_constraintVertical_bias="0.022" />

<TextView
    android:id="@+id/subfrage1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="84dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="101dp"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginTop="118dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintTop_toTopOf="parent" />

<TextView
    android:id="@+id/subfrage4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="135dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage5"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="152dp" />

<TextView
    android:id="@+id/subfrage6"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="169dp" />

<TextView
    android:id="@+id/subfrage7"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="186dp" />

<TextView
    android:id="@+id/subfrage8"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="203dp" />

<TextView
    android:id="@+id/subfrage9"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="220dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage10"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="237dp" />

<TextView
    android:id="@+id/AntwortA"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="273dp" />

<TextView
    android:id="@+id/AntwortB"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="290dp" />

<TextView
    android:id="@+id/AntwortC"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="307dp" />

<TextView
    android:id="@+id/AntwortD"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="325dp" />

<TextView
    android:id="@+id/AntwortE"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="342dp" />

<TextView
    android:id="@+id/AntwortF"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="359dp" />

<TextView
    android:id="@+id/AntwortG"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="376dp" />

<TextView
    android:id="@+id/AntwortH"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="393dp" />

<TextView
    android:id="@+id/AntwortI"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="410dp" />

<TextView
    android:id="@+id/AntwortJ"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="427dp" />

<CheckBox
    android:id="@+id/BoxA"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="206dp" />

<CheckBox
    android:id="@+id/BoxB"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="189dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"

    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxC"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="172dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxD"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="155dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxE"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="137dp"
    app:layout_constraintHorizontal_bias="0.113" />

<CheckBox
    android:id="@+id/BoxF"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="120dp"
    app:layout_constraintHorizontal_bias="0.023" />

<CheckBox
    android:id="@+id/BoxG"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="103dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxH"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="86dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxI"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="69dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxJ"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="52dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

</android.support.constraint.ConstraintLayout>

  listview.setVisibility(View.VISIBLE); 

按钮、文本视图或复选框也是如此

<TextView
    android:id="@+id/examchoosen"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.983"
    app:layout_constraintHorizontal_bias="0.92" />

<Button
    android:id="@+id/counter"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAllCaps="false"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="8dp"
    app:layout_constraintVertical_bias="0.982" />

<TextView
    android:id="@+id/countdown"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.016"
    app:layout_constraintHorizontal_bias="0.501" />

<TextView
    android:id="@+id/frage"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="42dp"
    app:layout_constraintHorizontal_bias="0.065"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="8dp"
    app:layout_constraintVertical_bias="0.022" />

<TextView
    android:id="@+id/subfrage1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="84dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="101dp"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginTop="118dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintTop_toTopOf="parent" />

<TextView
    android:id="@+id/subfrage4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="135dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage5"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="152dp" />

<TextView
    android:id="@+id/subfrage6"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="169dp" />

<TextView
    android:id="@+id/subfrage7"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="186dp" />

<TextView
    android:id="@+id/subfrage8"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="203dp" />

<TextView
    android:id="@+id/subfrage9"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:layout_editor_absoluteY="220dp"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintHorizontal_bias="0.103" />

<TextView
    android:id="@+id/subfrage10"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintHorizontal_bias="0.103"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="237dp" />

<TextView
    android:id="@+id/AntwortA"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="273dp" />

<TextView
    android:id="@+id/AntwortB"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="290dp" />

<TextView
    android:id="@+id/AntwortC"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="307dp" />

<TextView
    android:id="@+id/AntwortD"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="325dp" />

<TextView
    android:id="@+id/AntwortE"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="342dp" />

<TextView
    android:id="@+id/AntwortF"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="359dp" />

<TextView
    android:id="@+id/AntwortG"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="376dp" />

<TextView
    android:id="@+id/AntwortH"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="393dp" />

<TextView
    android:id="@+id/AntwortI"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="410dp" />

<TextView
    android:id="@+id/AntwortJ"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    tools:layout_editor_absoluteY="427dp" />

<CheckBox
    android:id="@+id/BoxA"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="206dp" />

<CheckBox
    android:id="@+id/BoxB"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="189dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"

    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxC"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="172dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxD"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="155dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxE"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="137dp"
    app:layout_constraintHorizontal_bias="0.113" />

<CheckBox
    android:id="@+id/BoxF"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginBottom="120dp"
    app:layout_constraintHorizontal_bias="0.023" />

<CheckBox
    android:id="@+id/BoxG"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="103dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxH"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="86dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxI"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="69dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.113"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<CheckBox
    android:id="@+id/BoxJ"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="52dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.023"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

</android.support.constraint.ConstraintLayout>

  checkBox.setChecked(true); //that won´t work if you add dynamically in a listview or linearlayout
  checkBox.toggle(); // will do the job, maybe it will work with .setChecked(!ischecked); but i had more problems with it 

就我与android studio的合作而言，我认识到如果你在编码中使用真/假（布尔值）或固定数字（即使设置为1和0），你的应用程序将有很多问题，无法流畅运行。在活动中，你需要与p