Using new IMMERSIVE mode in android kitkat

Question

I want to make an activity to go into IMMERSIVE mode and hide top and buttom system bars as soon as it starts.

In developers site of android they say I should use

Answer 1

Much nicer and credit to William J. Francis:

   public class GameActivity extends Activity{

    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        /* my code you dont need this
        assets=getAssets();
        sGame= new GameView(this, GAME_WIDTH, GAME_HEIGHT);
        setContentView(sGame);  
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        */


        getWindow().getDecorView().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 // hide nav bar
                | View.SYSTEM_UI_FLAG_FULLSCREEN // hide status bar
                | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
    }

@Override         
protected void onDoSomethingOtherImportantThing(){
...
}



}