Android 屏幕方向示例

屏幕方向是activity元素的属性。AndroidActivity的方向可以是纵向、横向、传感器、未指定等。您需要在AndroidManifest.xml文件中定义它。

语法:

 <activity android:name="package_name.Your_ActivityName"  
      android:screenOrientation="orirntation_type">  
</activity>  

示例：

<activity android:name=" example.javatpoint.com.screenorientation.MainActivity"  
     android:screenOrientation="portrait">  
</activity>

<activity android:name=".SecondActivity"  
     android:screenOrientation="landscape">  
</activity>

屏幕方向属性的常见取值如下：

Android纵向和横向屏幕方向示例

在这个示例中，我们将创建两个不同屏幕方向的Activity。第一个Activity（MainActivity）将是“纵向”方向，第二个Activity（SecondActivity）将是“横向”方向类型。

activity_main.xml

<?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="example.javatpoint.com.screenorientation.MainActivity">  


    <Button  
        android:id="@+id/button1"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_marginBottom="8dp"  
        android:layout_marginTop="112dp"  
        android:onClick="onClick"  
        android:text="Launch next activity"  
        app:layout_constraintBottom_toBottomOf="parent"  
        app:layout_constraintEnd_toEndOf="parent"  
        app:layout_constraintHorizontal_bias="0.612"  
        app:layout_constraintStart_toStartOf="parent"  
        app:layout_constraintTop_toBottomOf="@+id/editText1"  
        app:layout_constraintVertical_bias="0.613" />  

    <TextView  
        android:id="@+id/editText1"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_centerHorizontal="true"  
        android:layout_marginEnd="8dp"  
        android:layout_marginStart="8dp"  
        android:layout_marginTop="124dp"  
        android:ems="10"  
        android:textSize="22dp"  
        android:text="This activity is portrait orientation"  
        app:layout_constraintEnd_toEndOf="parent"  
        app:layout_constraintHorizontal_bias="0.502"  
        app:layout_constraintStart_toStartOf="parent"  
        app:layout_constraintTop_toTopOf="parent" />  
</android.support.constraint.ConstraintLayout>  

Activity类

package example.javatpoint.com.screenorientation;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    Button button1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button1=(Button)findViewById(R.id.button1);
    }
    public void onClick(View v) {
        Intent intent = new Intent(MainActivity.this,SecondActivity.class);
        startActivity(intent);
    }
}

activity_second.xml

<?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="example.javatpoint.com.screenorientation.SecondActivity">  

    <TextView  
        android:id="@+id/textView"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_marginEnd="8dp"  
        android:layout_marginStart="8dp"  
        android:layout_marginTop="180dp"  
        android:text="this is landscape orientation"  
        android:textSize="22dp"  
        app:layout_constraintEnd_toEndOf="parent"  
        app:layout_constraintHorizontal_bias="0.502"  
        app:layout_constraintStart_toStartOf="parent"  
        app:layout_constraintTop_toTopOf="parent" />  
</android.support.constraint.ConstraintLayout>  

SecondActivity类

package example.javatpoint.com.screenorientation;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class SecondActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);

    }
}

AndroidManifest.xml

在AndroidManifest.xml文件的activity中添加screenOrientation属性并提供其屏幕方向。在这个例子中，我们为MainActivity提供”portrait”方向，为SecondActivity提供”landscape”方向。

<?xml version="1.0" encoding="utf-8"?>  
<manifest xmlns:android="http://schemas.android.com/apk/res/android"  
    package="example.javatpoint.com.screenorientation">  

    <application  
        android:allowBackup="true"  
        android:icon="@mipmap/ic_launcher"  
        android:label="@string/app_name"  
        android:roundIcon="@mipmap/ic_launcher_round"  
        android:supportsRtl="true"  
        android:theme="@style/AppTheme">  
        <activity  
            android:name="example.javatpoint.com.screenorientation.MainActivity"  
            android:screenOrientation="portrait">  
            <intent-filter>  
                <action android:name="android.intent.action.MAIN" />  

                <category android:name="android.intent.category.LAUNCHER" />  
            </intent-filter>  
        </activity>  
        <activity android:name=".SecondActivity"  
            android:screenOrientation="landscape">  
        </activity>  
    </application>  

</manifest>  

输出：