Add:

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_NOSENSOR);
        ...
        ...
        ...
}

Activity.java

@Override     
 public void onConfigurationChanged(Configuration newConfig) {       
        try {     
            super.onConfigurationChanged(newConfig);      
            if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {      
                // land      
            } else if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {      
               // port       
            }    
        } catch (Exception ex) {       
     }   

AndroidManifest.xml

 <application android:icon="@drawable/icon" android:label="@string/app_name">
  <activity android:name="QRCodeActivity" android:label="@string/app_name"
  android:screenOrientation="landscape" >
   <intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.LAUNCHER" />
   </intent-filter>
  </activity>

 </application>

我发现最简单的方法就是把

this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

在onCreate中，就在后面

setContentView(R.layout.activity_main);

所以…

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}

Add

android:screenOrientation="portrait" 

or

 android:screenOrientation="landscape" 

到<activity>元素/s中 拿到载货单，你就完了。

android: screenOrientation =“肖像” 在应用程序标签<application

and

<活动 .．. .．. android: screenOrientation = "锁定" >

在AndroidManifest.xml中，ACTIVITY的以下属性就是你所需要的:

android:configChanges="orientation"

因此，完整的活动节点将是:

<activity android:name="Activity1"
          android:icon="@drawable/icon"
          android:label="App Name"
          android:excludeFromRecents="true"
          android:configChanges="orientation">
    <intent-filter>
        <action android:name="android.intent.action.MAIN"/>
        <category android:name="android.intent.category.LAUNCHER"/>
    </intent-filter>
</activity>