Question

我有一个文本视图和9个按钮。当我单击每个按钮时，textview的文本应该更改。但问题是这些项目无法正确显示该应用程序应该是这样的： https://i.imgur.com/ciRHbr3.png 这是xml：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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=".MainActivity">

    <TextView
        android:id="@+id/tv"
        android:layout_width="210dp"
        android:layout_height="100dp"
        android:text=""
        android:background="#B8D509"
        android:textColor="#03415A"
        android:gravity="center"
        tools:layout_editor_absoluteX="100dp"
        tools:layout_editor_absoluteY="59dp" />

    <Button
        android:id="@+id/button0"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="1"
        tools:layout_editor_absoluteX="16dp"
        tools:layout_editor_absoluteY="502dp" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="2"
        tools:layout_editor_absoluteX="161dp"
        tools:layout_editor_absoluteY="502dp" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="3"
        tools:layout_editor_absoluteX="307dp"
        tools:layout_editor_absoluteY="502dp" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="4"
        tools:layout_editor_absoluteX="16dp"
        tools:layout_editor_absoluteY="589dp" />

    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="5"
        tools:layout_editor_absoluteX="161dp"
        tools:layout_editor_absoluteY="589dp" />

    <Button
        android:id="@+id/button5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="6"
        tools:layout_editor_absoluteX="306dp"
        tools:layout_editor_absoluteY="589dp" />

    <Button
        android:id="@+id/button6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="7"
        tools:layout_editor_absoluteX="16dp"
        tools:layout_editor_absoluteY="666dp" />

    <Button
        android:id="@+id/button7"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="8"
        tools:layout_editor_absoluteX="161dp"
        tools:layout_editor_absoluteY="665dp" />

    <Button
        android:id="@+id/button8"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="9"
        tools:layout_editor_absoluteX="305dp"
        tools:layout_editor_absoluteY="666dp" />

</androidx.constraintlayout.widget.ConstraintLayout>

但是结果是这样的： https://i.imgur.com/AmKCkba.jpg 请告诉我该怎么做才能让我的应用程序完全像android studio的预览

Answer 1

您需要为ConstraintLayout设置约束：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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=".MainActivity">

    <TextView
        android:id="@+id/tv"
        android:layout_width="210dp"
        android:layout_height="100dp"
        android:layout_marginTop="24dp"
        android:background="#B8D509"
        android:gravity="center"
        android:text=""
        android:textColor="#03415A"
        app:layout_constraintBottom_toTopOf="@+id/button1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button0"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="1"
        app:layout_constraintEnd_toStartOf="@+id/button1"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/button1" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="2"
        app:layout_constraintBottom_toTopOf="@+id/button4"
        app:layout_constraintEnd_toStartOf="@+id/button2"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/button0"
        app:layout_constraintTop_toBottomOf="@+id/tv" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="3"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/button1"
        app:layout_constraintTop_toTopOf="@+id/button1" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="4"
        app:layout_constraintEnd_toStartOf="@+id/button4"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/button4" />

    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="5"
        app:layout_constraintBottom_toTopOf="@+id/button7"
        app:layout_constraintEnd_toStartOf="@+id/button5"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/button3"
        app:layout_constraintTop_toBottomOf="@+id/button1" />

    <Button
        android:id="@+id/button5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="6"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/button4"
        app:layout_constraintTop_toTopOf="@+id/button4" />

    <Button
        android:id="@+id/button6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="7"
        app:layout_constraintEnd_toStartOf="@+id/button7"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/button7" />

    <Button
        android:id="@+id/button7"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="8"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/button8"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/button6"
        app:layout_constraintTop_toBottomOf="@+id/button4" />

    <Button
        android:id="@+id/button8"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="9"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/button7"
        app:layout_constraintTop_toTopOf="@+id/button7" />

</androidx.constraintlayout.widget.ConstraintLayout>

活动项目（文本视图和某些按钮）显示不正确

1 个答案: