hello-world/DetectActivityOrientationChange at master · alex-jin/hello-world · GitHub

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//detect activity orientation change after Activity.setRequestedOrientation was called

public class Activity {
  private OrientationEventListener mOrientationListener;

  @Override
  public void onCreate(Bundle b) {
     mOrientationListener
                = new OrientationEventListener(this, SensorManager.SENSOR_DELAY_NORMAL){

            @Override
            public void onOrientationChanged(int degree) {
                // TODO Auto-generated method stub
                LogFactory.w("onOrientationChanged", degree + "");
                if (mIsLandscape) {
                    if ( 260 <= degree && degree <= 280) {
                        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
                    } else if (80 <=degree && degree <= 100) {
                        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE);
                    }
                }
            }};

        if (mOrientationListener.canDetectOrientation()){
            mOrientationListener.enable();
        }
  }

  @Override
    public void onDestroy() {
        super.onDestroy();
        if (mOrientationListener != null) {
            mOrientationListener.disable();
        }
    }
}