// This snippet hides the system bars.
 2 private void hideSystemUI() {
 3     // Set the IMMERSIVE flag.
 4     // Set the content to appear under the system bars so that the content
 5     // doesn't resize when the system bars hide and show.
 6     //开启全屏模式
 7     mDecorView.setSystemUiVisibility(
 8             View.SYSTEM_UI_FLAG_LAYOUT_STABLE
 9             | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
10             | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
11             | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION // hide nav bar
12             | View.SYSTEM_UI_FLAG_FULLSCREEN // hide status bar
13             | View.SYSTEM_UI_FLAG_IMMERSIVE);
14 }
15 
16 // This snippet shows the system bars. It does this by removing all the flags
17 // except for the ones that make the content appear under the system bars.
18 //取消全屏模式
19 private void showSystemUI() {
20     mDecorView.setSystemUiVisibility(
21             View.SYSTEM_UI_FLAG_LAYOUT_STABLE
22             | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
23             | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
24 }