Question

我想知道为什么Listview和按钮在横向模式下消失。当我点击“获取数据”按钮并在Listview中显示Json字符串时，我编写了一个简单的代码来解析服务器中的Json。

我的activity_main.xml文件

<?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.demoapp.mrrobot.volleyexample.MainActivity">

    <Button
        android:id="@+id/buttonGet"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="461dp"
        android:text="Get Data"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        tools:ignore="HardcodedText,MissingConstraints" />

    <ListView
        android:id="@+id/listView"
        android:layout_width="349dp"
        android:layout_height="436dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        tools:ignore="MissingConstraints"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.514"
        android:layout_marginBottom="16dp" />
    android:configChanges="orientation|screenSize|keyboard">
</android.support.constraint.ConstraintLayout>

我的list_view_layout.xml文件

<?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"
    android:orientation="vertical"
    android:weightSum="1">
     <TextView
        android:id="@+id/textViewId"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="New Text"
        tools:layout_constraintTop_creator="1"
        tools:layout_constraintRight_creator="1"
        app:layout_constraintRight_toRightOf="parent"
        tools:layout_constraintLeft_creator="1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="-3dp"
        app:layout_constraintHorizontal_bias="0.0" />

    <TextView
        android:id="@+id/textViewName"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="New Text"
        tools:ignore="MissingConstraints"
        tools:layout_constraintTop_creator="1"
        tools:layout_constraintRight_creator="1"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_marginTop="16dp"
        tools:layout_constraintLeft_creator="1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="@+id/textViewId"
        app:layout_constraintHorizontal_bias="0.0" />

    <TextView
        android:id="@+id/textViewEmail"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="New Text"
        tools:layout_constraintTop_creator="1"
        tools:layout_constraintRight_creator="1"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textViewName"
        tools:layout_constraintLeft_creator="1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        android:layout_marginTop="0dp" />
   // android:configChanges="orientation|screenSize">
</android.support.constraint.ConstraintLayout>

Answer 1

您应该为横向模式创建一个不同的.xml文件，并将其放在文件夹layout-land

中

如何使列表视图和按钮以横向模式显示

1 个答案: