• 去除安卓系统顶部状态栏：
  requestWindowFeature一定要在setContentView之前调用：

 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_main);
 
    }

• 去除app标题栏
  在activity的样式里加入：

  <item name="windowActionBar">false</item>
   <item name="windowNoTitle">true</item>