当Activity继承AppCompatActivity如何实现隐藏标题栏与状态栏

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        getSupportActionBar().hide();//隐藏标题栏
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN); // 隐藏状态栏

        setContentView(R.layout.activity_main);
}