Android Project Practice (): immersive effect on the status bar of game and video applications, and android practice

Android Project Practice (): immersive effect on the status bar of game and video applications, and android practice

Requirements:

Mobile app, when playing a game or watching a video in full screen, you will find that the status bar at the top of the mobile phone is not displayed at this time. When we slide down from the top of the mobile phone or move up at the bottom of the mobile phone, the status bar is displayed. If the operation is not performed for a few seconds, the status bar is hidden again.

　　

　　Implementation Code:

@ Override
Protected void onCreate (Bundle savedInstanceState ){
Super. onCreate (savedInstanceState );
SetContentView (R. layout. activity_main );
}

@ Override
Public void onWindowFocusChanged (boolean hasFocus ){
Super. onWindowFocusChanged (hasFocus );
If (hasFocus & Build. VERSION. SDK_INT> = 19) {// if there is a focus, it indicates that the current interaction with the user and SDK_INT> = 19 only Android4.4 + supports immersive Effects
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 );
}
}

　　Effect:

 

　Code explanation:

1. onWindowFocusChanged (boolean hasFocus) Method

The Activity life cycle can be understood as that, when this method is reached, the activity is truly displayed/disappears in the interaction layer. When the activity is displayed on the top of the stack and interacts with the user, there is a focus. hasFocus is true. When the activity exits from the top of the stack and does not interact with the user, there is no focus, hasFocus is false.

 

 

2. getWindow. getDecorView () method to obtain the top-level View of the Window interface

1. DecorView is the top View of the entire Window interface. 2. DecorView has only one child element, LinearLayout. Indicates the entire Window interface, including the notification bar, title bar, and content display bar. 3. LinearLayout contains two FrameLayout sub-elements. (20) The title bar display interface. Only one TextView displays the application name. You can also customize the title bar. The loaded custom title bar View will be added to FrameLayout. (21) shows the content bar. Is the layout interface loaded by the setContentView () method.

 

 

　　　　

Note:

The difference between full screen display and Activity is that if the mobile phone has a virtual Navigation Bar (that is, the virtual back, home Key), the full screen will always be displayed, the above requirement is incorrect when full screen is used.