Android: listen for Orientation change?

How would I listen for orientation change in Android? and do certain things when the user has switched to开发者_如何学Python landscape?

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You have a couple of choices:

• Use an OrientationEventListener, which has a method called onOrientationChanged.

• Use config changes:

In your Manifest, put:

<activity android:name=".HelloAndroid"
    android:label="@string/app_name"
    android:configChanges="orientation">

And, in your Activity, override onConfigurationChanged:

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);

    int newOrientation = newConfig.orientation;

    if (newOrientation == Configuration.ORIENTATION_LANDSCAPE) {
      // Do certain things when the user has switched to landscape.    
    }   
}

Here is a good tutorial about it.

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In your activity, you can override this method to listen to Orientation Change and implement your own code.

public void onConfigurationChanged (Configuration newConfig)

The Configuration Class has an int constant ORIENTATION_LANDSCAPE and ORIENTATION_PORTRAIT, there for you can check the newConfig like this:

super.onConfigurationChanged(newConfig);

int orientation=newConfig.orientation;

switch(orientation) {

case Configuration.ORIENTATION_LANDSCAPE:

//to do something
 break;

case Configuration.ORIENTATION_PORTRAIT:

//to do something
 break;

}

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As of Android 3.2, you also need to add "screenSize" in androidmanifest for specific activity

So your activity declaration in xml will become

<activity android:name=".ExampleActivity"
    android:label="@string/app_name"
    android:configChanges="orientation|screenSize">