public class MySingleton extends AppCompatActivity {

    private static MySingleton mInstance;

    public static MySingleton getInstance() {
        if (mInstance == null) {
            mInstance = new MySingleton();
        }
        return mInstance;
    }

    private MySingleton() {}

    private Drawable getDrawable() {
        return getResources().getDrawable(R.drawable.ic_favorite);
    }

}