Android: Example showing layout dependent event handling. Taking different actions for phones and tablets.

ImageSelectorFragment.onOptionsItemSelected().java

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    Log.d(TAG, "onOptionsItemSelected");

    switch (item.getItemId()) {
        case R.id.menu_rotate:
            Log.i(TAG, "onOptionsItemSelected: rotate menu item selected");
            
            // This menu option is only provided to phone layouts, since
            // tablet layouts show the image rotator at all times
            
            // Get the parent activity's fragment manager
            FragmentManager fragmentManager = getFragmentManager();
            
            // Create the image rotator fragment and pass in arguments
            ImageRotatorFragment imageRotatorFragment = ImageRotatorFragment.newInstance(mCurImageResourceId);
            
            // Add the new fragment on top of this one, and add it to
            // the back stack
            FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
            fragmentTransaction.replace(mContainer.getId(), imageRotatorFragment, ImageRotatorFragment.class.getName());
            fragmentTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
            fragmentTransaction.addToBackStack(null);
            
            // Commit the transaction
            fragmentTransaction.commit();
            
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}

MainActivity.onImageSelected().java

@Override
public void onImageSelected(ImageItem imageItem, int position) {
    Log.d(TAG, "onImageSelected: title = " + imageItem.getTitle() + " position = " + position);
    
    FragmentManager fragmentManager = getSupportFragmentManager();
    ImageRotatorFragment imageRotatorFragment = (ImageRotatorFragment) fragmentManager.findFragmentByTag(
            ImageRotatorFragment.class.getName());
    
    // If the rotating fragment is in the current layout, update its
    // selected image
    if (imageRotatorFragment != null) {
        imageRotatorFragment.setImageSelected(imageItem, position);
    }
}