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 setSystemUiVisibility() and provide SYSTEM_UI_FLAG_IMMERSIVE and SYSTEM_UI_FLAG_HIDE_NAVIGATION.

How can I do this in the OnCreate() method of the activity? I think the setSystemUiVisibility is not provided in the Activity class and it should happen in a view. Is there a workaround?

UPDATE

ok According to doorstuck I added the following lines but I dont see any changes, navigation bar and buttom buttons are still visible :

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (savedInstanceState == null) {
        }
        getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
        getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_IMMERSIVE);
    }

    //Rest of activity code

Answer 1

Get the decor view:

getWindow().getDecorView().setSystemUiVisibility(...)

Remember that the arguments are bit flags. Only call the method above once:

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
        | View.SYSTEM_UI_FLAG_FULLSCREEN
        | View.SYSTEM_UI_FLAG_IMMERSIVE);