MainActivity.java

引入importandroid.view.View;

//粘性沉浸模式隐藏导航栏和状态栏
View decorView = getWindow().getDecorView();
decorView.setSystemUiVisibility(
View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
| View.SYSTEM_UI_FLAG_FULLSCREEN
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);

官方文档：https://developer.android.com/reference/android/view/View#sticky-immersive