public MyServiceOne extends Service {

    public SharedPreferences mSharedPreferences;

    // Listener defined by anonymous inner class.
    public OnSharedPreferenceChangeListener mListener = new OnSharedPreferenceChangeListener() {

        @Override
        public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
            Log.d("debug", "A preference has been changed");
        }
    };

    @Override
    public void onCreate() {
        mSharedPreferences = getSharedPreferences(MySharedPreferences.NAME, Context.MODE_PRIVATE);
        mSharedPreferences.registerOnSharedPreferenceChangeListener(mListener);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mSharedPreferences.unregisterOnSharedPreferenceChangeListener(mListener);
    }
}