无涯教程-Android - 屏幕方向 screenOrientation 是Activity元素的属性。 Androi

screenOrientation 是Activity元素的属性。 Android Activity的方向可以是纵向(portrait)，横向(landscape)，传感器(sensor)，未指定(unspecified)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.learnfk.com.screenorientation.MainActivity" android:screenOrientation="portrait"></activity>

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

screenOrientation属性的公共值如下:

值	描述
unspecified	它是默认值。在这种情况下，系统选择方向。
portrait	纵向
landscape	横向
sensor	方向由器件方向传感器确定。

纵向和横向示例

在此示例中，无涯教程将创建两个不同屏幕方向的Activity。第一种Activity将是"纵向(portrait)"定向和第二个Activity，作为"landscape(横向)"定向类型。

File: 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">  
&lt;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" /&gt;  

&lt;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" /&gt;  

</android.support.constraint.ConstraintLayout>

File: MainActivity.java

package example.learnfk.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 {
</span><span class="typ">Button</span><span class="pln"> button1</span><span class="pun">;</span><span class="pln">
</span><span class="lit">@Override</span><span class="pln">
</span><span class="kwd">protected</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> onCreate</span><span class="pun">(</span><span class="typ">Bundle</span><span class="pln"> savedInstanceState</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
    </span><span class="kwd">super</span><span class="pun">.</span><span class="pln">onCreate</span><span class="pun">(</span><span class="pln">savedInstanceState</span><span class="pun">);</span><span class="pln">
    setContentView</span><span class="pun">(</span><span class="pln">R</span><span class="pun">.</span><span class="pln">layout</span><span class="pun">.</span><span class="pln">activity_main</span><span class="pun">);</span><span class="pln">

    button1</span><span class="pun">=(</span><span class="typ">Button</span><span class="pun">)</span><span class="pln">findViewById</span><span class="pun">(</span><span class="pln">R</span><span class="pun">.</span><span class="pln">id</span><span class="pun">.</span><span class="pln">button1</span><span class="pun">);</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> onClick</span><span class="pun">(</span><span class="typ">View</span><span class="pln"> v</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
    </span><span class="typ">Intent</span><span class="pln"> intent </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">Intent</span><span class="pun">(</span><span class="typ">MainActivity</span><span class="pun">.</span><span class="kwd">this</span><span class="pun">,</span><span class="typ">SecondActivity</span><span class="pun">.</span><span class="kwd">class</span><span class="pun">);</span><span class="pln">
    startActivity</span><span class="pun">(</span><span class="pln">intent</span><span class="pun">);</span><span class="pln">
</span><span class="pun">}</span><span class="pln">

}

File: 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">  
&lt;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" /&gt;  

</android.support.constraint.ConstraintLayout>

File: SecondActivity.java

package example.learnfk.com.screenorientation;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class SecondActivity extends AppCompatActivity {
</span><span class="lit">@Override</span><span class="pln">
</span><span class="kwd">protected</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> onCreate</span><span class="pun">(</span><span class="typ">Bundle</span><span class="pln"> savedInstanceState</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
    </span><span class="kwd">super</span><span class="pun">.</span><span class="pln">onCreate</span><span class="pun">(</span><span class="pln">savedInstanceState</span><span class="pun">);</span><span class="pln">
    setContentView</span><span class="pun">(</span><span class="pln">R</span><span class="pun">.</span><span class="pln">layout</span><span class="pun">.</span><span class="pln">activity_second</span><span class="pun">);</span><span class="pln">

</span><span class="pun">}</span><span class="pln">

}

File: AndroidManifest.xml

在AndroidManifest.xml文件中，在Activity中添加screenOrientation属性并提供其方向。

<!--?xml version="1.0" encoding="utf-8"?-->
<manifest
    xmlns:android="http://schemas.android.com/apk/res/android" package="example.learnfk.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.learnfk.com.screenorientation.MainActivity" android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"></action>
                <category android:name="android.intent.category.LAUNCHER"></category>
            </intent-filter>
        </activity>
        <activity android:name=".SecondActivity" android:screenOrientation="landscape"></activity>
    </application>
</manifest>

运行上面代码输出

android screen orientation example output 1

android screen orientation example output 2

无涯教程-Android - 屏幕方向

纵向和横向示例

参考链接