How to detect when the device switch from portrait to landscape mode?

Question

I have an app which shows fullscreen bitmaps in an activity. In order to provide fast loading time, I load them in the memory. But when the screen changes orientation, I would like to clear the cache in order to fill it again with bitmaps that fit inside the new dimensions. The only problem is that in order to do this, I need to detect when an orientation change occurs. Do anyone know how to detect this?

Answer 1

See the official documentation http://developer.android.com/guide/topics/resources/runtime-changes.html

Changing it will actually create a new view and onCreate will be called again.

Furthermore you can check it via

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

    // Checks the orientation of the screen
    if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
        Toast.makeText(this, "landscape", Toast.LENGTH_SHORT).show();
    } else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){
        Toast.makeText(this, "portrait", Toast.LENGTH_SHORT).show();
    }
}