Android studio 按钮赢了'；不要填满整个空间

我想我的布局显示6个按钮，填充整个屏幕一样，但目前每个按钮只填充其填充

这6个按钮显示在ScrollView中的ConstraintLayout中，以便在任何设备上都能很好地显示布局

这是我的布局：

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fillViewport="true"
    tools:context=".MainActivity" >

    <android.support.constraint.ConstraintLayout
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <Button
            android:id="@+id/idbutton1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="BUTTON1"
            app:layout_constraintBottom_toTopOf="@+id/idbutton3"
            app:layout_constraintEnd_toStartOf="@+id/idbutton2"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:background="#f0eb79"
            android:foreground="?attr/selectableItemBackground"
            android:drawableTop="@drawable/default_icon"
            android:textAllCaps="false"
            android:textColor="#ffffff"
            android:textSize="18sp"
            android:padding="25dp" />

        <Button
            android:id="@+id/idbutton2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="BUTTON2"
            app:layout_constraintBottom_toTopOf="@+id/idbutton4"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/idbutton1"
            app:layout_constraintTop_toTopOf="parent"
            android:background="#000"
            android:foreground="?attr/selectableItemBackground"
            android:drawableTop="@drawable/default_icon"
            android:textAllCaps="false"
            android:textColor="#ffffff"
            android:textSize="18sp"
            android:padding="25dp" />

        <Button
            android:id="@+id/idbutton3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="BUTTON3"
            app:layout_constraintEnd_toStartOf="@+id/idbutton4"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/idbutton1"
            app:layout_constraintBottom_toTopOf="@+id/idbutton5"
            android:background="#f0eb79"
            android:foreground="?attr/selectableItemBackground"
            android:drawableTop="@drawable/default_icon"
            android:textAllCaps="false"
            android:textColor="#ffffff"
            android:textSize="18sp"
            android:padding="25dp" />

        <Button
            android:id="@+id/idbutton4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="BUTTON4"
            app:layout_constraintBottom_toTopOf="@+id/idAppointments"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/idbutton3"
            app:layout_constraintTop_toBottomOf="@+id/idbutton2"
            android:background="#000"
            android:foreground="?attr/selectableItemBackground"
            android:drawableTop="@drawable/default_icon"
            android:textAllCaps="false"
            android:textColor="#ffffff"
            android:textSize="18sp"
            android:padding="25dp" />

        <Button
            android:id="@+id/idbutton5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="BUTTON5"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/idAppointments"
            app:layout_constraintTop_toBottomOf="@+id/idbutton3"
            app:layout_constraintStart_toStartOf="parent"
            android:background="#f0eb79"
            android:foreground="?attr/selectableItemBackground"
            android:drawableTop="@drawable/default_icon"
            android:textAllCaps="false"
            android:textColor="#ffffff"
            android:textSize="18sp"
            android:padding="25dp" />

        <Button
            android:id="@+id/idAppointments"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="BUTTON6"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/idbutton5"
            app:layout_constraintTop_toBottomOf="@+id/idbutton4"
            android:background="#000"
            android:foreground="?attr/selectableItemBackground"
            android:drawableTop="@drawable/default_icon"
            android:textAllCaps="false"
            android:textColor="#ffffff"
            android:textSize="18sp"
            android:padding="25dp" />

    </android.support.constraint.ConstraintLayout>

</ScrollView>

你可以看到按钮周围有我不想要的空间。有没有办法让按钮填满整个空间？
尝试使用下面的代码（在这个示例中，我删除了android:drawableTop=“@drawable/default_icon”，但只需再次添加它）



使用此布局后，ScrollView停止工作，我需要它用于横向模式，否则所有内容都会被挤压。您可以将高度更改为固定大小，如200 dp。您也可以将包裹内容用作高度，但您的按钮将非常小
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/scrollView2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
tools:context=".MainActivity"
>

<android.support.constraint.ConstraintLayout xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <Button
        android:id="@+id/idbutton1"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="#f0eb79"
        android:foreground="?attr/selectableItemBackground"
        android:padding="25dp"
        android:text="BUTTON1"
        android:textAllCaps="false"
        android:textColor="#ffffff"
        android:textSize="18sp"
        app:layout_constraintBottom_toTopOf="@+id/idbutton3"
        app:layout_constraintEnd_toStartOf="@+id/idbutton2"
        app:layout_constraintHorizontal_chainStyle="spread_inside"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/idbutton2"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="#000"
        android:foreground="?attr/selectableItemBackground"
        android:padding="25dp"
        android:text="BUTTON2"
        android:textAllCaps="false"
        android:textColor="#ffffff"
        android:textSize="18sp"
        app:layout_constraintBottom_toTopOf="@+id/idbutton4"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/idbutton1"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/idbutton3"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="#f0eb79"
        android:foreground="?attr/selectableItemBackground"
        android:padding="25dp"
        android:text="BUTTON3"
        android:textAllCaps="false"
        android:textColor="#ffffff"
        android:textSize="18sp"
        app:layout_constraintBottom_toTopOf="@+id/idbutton5"
        app:layout_constraintEnd_toStartOf="@+id/idbutton4"
        app:layout_constraintHorizontal_chainStyle="packed"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/idbutton1" />

    <Button
        android:id="@+id/idbutton4"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="#000"
        android:foreground="?attr/selectableItemBackground"
        android:padding="25dp"
        android:text="BUTTON4"
        android:textAllCaps="false"
        android:textColor="#ffffff"
        android:textSize="18sp"
        app:layout_constraintBottom_toTopOf="@+id/idAppointments"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/idbutton3"
        app:layout_constraintTop_toBottomOf="@+id/idbutton2" />

    <Button
        android:id="@+id/idbutton5"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="#f0eb79"
        android:foreground="?attr/selectableItemBackground"
        android:padding="25dp"
        android:text="BUTTON5"
        android:textAllCaps="false"
        android:textColor="#ffffff"
        android:textSize="18sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/idAppointments"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/idbutton3" />

    <Button
        android:id="@+id/idAppointments"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="#000"
        android:foreground="?attr/selectableItemBackground"
        android:padding="25dp"
        android:text="BUTTON6"
        android:textAllCaps="false"
        android:textColor="#ffffff"
        android:textSize="18sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/idbutton5"
        app:layout_constraintTop_toBottomOf="@+id/idbutton4" />

</android.support.constraint.ConstraintLayout>