Android - Set default preference values for a modern fragment-based PreferenceActivity

MyApplication.java

public class MyApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        
        // we cannot call setDefaultValues for multiple fragment based XML preference
        // files with readAgain flag set to false, so always check KEY_HAS_SET_DEFAULT_VALUES 
        if (!PreferenceManager.getDefaultSharedPreferences(getApplicationContext())
                .getBoolean(PreferenceManager.KEY_HAS_SET_DEFAULT_VALUES, false)) {
            PreferenceManager.setDefaultValues(getApplicationContext(), R.xml.pref_general, true);
            PreferenceManager.setDefaultValues(getApplicationContext(), R.xml.pref_labels, true);
            PreferenceManager.setDefaultValues(getApplicationContext(), R.xml.pref_appearance, true);
        }

    }

}