OrientationEventListener not working properly

Posted by nixau on Stack Overflow See other posts from Stack Overflow or by nixau
Published on 2010-06-07T08:42:27Z Indexed on 2010/06/07 9:22 UTC
Read the original article Hit count: 598

Hi all,

I need to handle orientation changes in my Android application. For this purpose I decided to use OrientationEventListener convenience class. But his callback method is given somewhat strange behavior.

My application starts in the portrait mode and then eventually switches to the lanscape one. I have some custom code executing in the callback onOrientationChanged method that provides some additional UI handling logic - it has a few calls to findViewById. What is strange is that when switching back from landscape to portrait mode onOrientationChanged callback is called twice, and what's even worse - the second call is dealing with bad Context - findViewById method starts returning null. These calls are made right from the MainThread

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    listener = new OrientationListener();
}

    @Override
protected void onResume() {     
    super.onResume();
    // enabling listening
    listener.enable();
}
    @Override
protected void onPause() {
    super.onPause();
    // disabling listening
    listener.disable();
}

I've replicated the same behavior with a dummy Activity without any logic except for one that deals with orientation hadling. I initiate orientation switch from the Android 2.2 emulator by pressing Ctrl+F11 What could be wrong?

Upd: Inner class that implements OrientationEventListener

private class OrientationListener extends OrientationEventListener {
    public OrientationL() {
        super(getBaseContext());
    }

    @Override
    public void onOrientationChanged(int orientation) {

        toString();

    }
}

}

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