Android 如何修复running应用程序中的布局？

我有一个布局活动，它包含一些编辑文本、按钮和文本视图，但我有一个问题，除了文本视图“已注册？登录”之外，模拟器上没有显示任何内容，其他内容也没有显示在活动上

 <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.mohamed.myawesomeapplication.MainActivity">

    <EditText
        android:id="@+id/emailReg"
        android:layout_width="368dp"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:layout_marginBottom="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginTop="8dp"
        android:hint="Enter your email"
        android:inputType="textEmailAddress"
        app:layout_constraintBottom_toTopOf="@+id/pssReg"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.849" />

    <EditText
        android:id="@+id/pssReg"
        android:layout_width="368dp"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:layout_marginBottom="16dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:hint="Enter your password"
        android:inputType="textPassword"
        app:layout_constraintBottom_toTopOf="@+id/regReg"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent" />

    <Button
        android:id="@+id/regReg"
        android:layout_width="353dp"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:layout_marginBottom="12dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:text="Register"
        app:layout_constraintBottom_toTopOf="@+id/signinReg"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/signinReg"
        android:layout_width="368dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:text="Already Registered? sign in"
        android:textAlignment="center"
        app:layout_constraintStart_toStartOf="parent"
        tools:ignore="MissingConstraints"
        tools:layout_editor_absoluteY="207dp"
        android:layout_marginLeft="8dp" />
</android.support.constraint.ConstraintLayout>

这在设计上是正常的，当我运行应用程序时，模拟器上除了文本视图“已注册？登录”之外没有显示任何内容，其他内容也没有显示在活动上（根据@Pakeeza的建议编辑）

 <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.mohamed.myawesomeapplication.MainActivity">

    <EditText
        android:id="@+id/emailReg"
        android:layout_width="368dp"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:layout_marginBottom="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginTop="8dp"
        android:hint="Enter your email"
        android:inputType="textEmailAddress"
        app:layout_constraintBottom_toTopOf="@+id/pssReg"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.849" />

    <EditText
        android:id="@+id/pssReg"
        android:layout_width="368dp"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:layout_marginBottom="16dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:hint="Enter your password"
        android:inputType="textPassword"
        app:layout_constraintBottom_toTopOf="@+id/regReg"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent" />

    <Button
        android:id="@+id/regReg"
        android:layout_width="353dp"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:layout_marginBottom="12dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:text="Register"
        app:layout_constraintBottom_toTopOf="@+id/signinReg"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/signinReg"
        android:layout_width="368dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:text="Already Registered? sign in"
        android:textAlignment="center"
        app:layout_constraintStart_toStartOf="parent"
        tools:ignore="MissingConstraints"
        tools:layout_editor_absoluteY="207dp"
        android:layout_marginLeft="8dp" />
</android.support.constraint.ConstraintLayout>

使用相对布局或线性布局代替约束布局。您可以更改xml中的布局类型

<LinearLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.android.practiceset2.MainActivity"
android:orientation="vertical">

<EditText
    android:id="@+id/emailReg"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="15dp"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    android:hint="Enter your email"
    android:inputType="textEmailAddress"
     />

<EditText
    android:id="@+id/pssReg"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="15dp"
    android:layout_marginBottom="16dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:hint="Enter your password"
    android:inputType="textPassword"
     />

<Button
    android:id="@+id/regReg"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="15dp"
    android:layout_marginBottom="12dp"
    android:layout_marginEnd="8dp"
    android:layout_marginStart="8dp"
    android:text="Register"
     />

<TextView
    android:id="@+id/signinReg"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginStart="8dp"
    android:text="Already Registered? sign in"
    android:textAlignment="center"
    android:layout_marginLeft="8dp" /> </LinearLayout>

（根据@Pakeeza的建议进行编辑）

使用相对布局或线性布局代替约束布局。您可以更改xml中的布局类型

<LinearLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.android.practiceset2.MainActivity"
android:orientation="vertical">

<EditText
    android:id="@+id/emailReg"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="15dp"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    android:hint="Enter your email"
    android:inputType="textEmailAddress"
     />

<EditText
    android:id="@+id/pssReg"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="15dp"
    android:layout_marginBottom="16dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:hint="Enter your password"
    android:inputType="textPassword"
     />

<Button
    android:id="@+id/regReg"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="15dp"
    android:layout_marginBottom="12dp"
    android:layout_marginEnd="8dp"
    android:layout_marginStart="8dp"
    android:text="Register"
     />

<TextView
    android:id="@+id/signinReg"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginStart="8dp"
    android:text="Already Registered? sign in"
    android:textAlignment="center"
    android:layout_marginLeft="8dp" /> </LinearLayout>

---

如果您想将密码编辑文本放在电子邮件编辑文本的底部，请使用

app:layout\u constraintTop\u toBottomOf

。这对你有用

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.mohamed.myawesomeapplication.MainActivity">

    <EditText
        android:id="@+id/emailReg"
        android:layout_width="368dp"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginTop="8dp"
        android:hint="Enter your email"
        android:inputType="textEmailAddress"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        />

    <EditText
        android:id="@+id/pssReg"
        android:layout_width="368dp"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginTop="8dp"
        android:hint="Enter your password"
        android:inputType="textPassword"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/emailReg"/>

    <Button
        android:id="@+id/regReg"
        android:layout_width="353dp"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="Register"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.533"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/pssReg"/>

    <TextView
        android:id="@+id/signinReg"
        android:layout_width="368dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="Already Registered? sign in"
        android:textAlignment="center"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/regReg"
        tools:ignore="MissingConstraints"/>
</android.support.constraint.ConstraintLayout>

---

如果您想将密码编辑文本放在电子邮件编辑文本的底部，请使用

app:layout\u constraintTop\u toBottomOf

。这对你有用

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.mohamed.myawesomeapplication.MainActivity">

    <EditText
        android:id="@+id/emailReg"
        android:layout_width="368dp"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginTop="8dp"
        android:hint="Enter your email"
        android:inputType="textEmailAddress"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        />

    <EditText
        android:id="@+id/pssReg"
        android:layout_width="368dp"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginTop="8dp"
        android:hint="Enter your password"
        android:inputType="textPassword"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/emailReg"/>

    <Button
        android:id="@+id/regReg"
        android:layout_width="353dp"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="Register"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.533"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/pssReg"/>

    <TextView
        android:id="@+id/signinReg"
        android:layout_width="368dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="Already Registered? sign in"
        android:textAlignment="center"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/regReg"
        tools:ignore="MissingConstraints"/>
</android.support.constraint.ConstraintLayout>