Android显示和隐藏状态栏和导航栏

横竖屏切换的时候显示和隐藏状态栏：

 //竖屏
//            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN); //显示状态栏
            View decorView = getWindow().getDecorView();
            decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);//全部显示出

 //横屏
//            getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN); //隐藏状态栏
 
            View decorView = getWindow().getDecorView();
            decorView.setSystemUiVisibility(
                    View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                            | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                            | View.SYSTEM_UI_FLAG_FULLSCREEN
                            | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);