Develop Reference

Full screen android app without statusbar and system navigationbar

I want to enable and to disable statusbar and navigation bar in my android app. For this i use next methods:
private void hideSystemUi() {
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);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
}
private void showSystemUi() {
decorView.setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
}
where
decorView = getWindow().getDecorView();
It works okay: these methods show and hide statusbar with navigationbar, BUT there is the problem: when statusbar is hide, i can to show it with top-bottom swipe in top part of my screen; similar situation with navigationbar. So , how to resolve this? I want to disable these system view fully, without possibility to show them with swipe. Thanks.

Status and navigation bar showing when scrolling Recycler view in immersive mode

I'm implementing immersive mode using this code:
activity.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
);
But the problem is as I scroll the recycler view, the status and navigation bar are shown as an item view reaches the top. It's hard to explain but here's the gif:
https://giphy.com/gifs/xT4uQiBlagrD9ljQqc
Note that as an item view approaches the top, the status bar is shown (only the dark background is shown though). Note also the navigation bar as an item view's bottom reaches the boundary of the navigation bar (notice the gray background at the bottom).
This happens for every item in the recycler view which is really annoying.

It's missing you some UI options like immersive sticky.
Here's my working ui options:
View decorView = getWindow().getDecorView();
int uiOptions = 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;
decorView.setSystemUiVisibility(uiOptions);

the hidden Navigationbar is appeared when toolbar menu button is clicked

I have used the method presented here to hide Navigationbar. It works properly but when I tap the context menu button (three vertical points in the right side of the toolbar), the navigationbar is appeared again.
I have used the code:
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);
in onResume(), onCreate(), onOptionsItemSelected(), onWindowFocusChanged().
If all of menu items are set to app:showAsAction="always" the Navigationbar is never appeared but when some are shown in the list, it appeard.

Why is onMenuOpened is not called?

An app hides the action bar in the following way:
uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION| View.SYSTEM_UI_FLAG_FULLSCREEN
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
//Hide both the status bar and navigation bar
getWindow().getDecorView().setSystemUiVisibility(uiOptions);
When the screen is touched, the following method is called to show the action bar:
uiOptions = View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
decorView.setSystemUiVisibility(uiOptions);
Everything works as expected except when the overflow menu is opened after the 3-dot is tapped, onMenuOpened of the activity is not called, but the menu is opened normally.
Could anyone shed some light on this?

Possibly this.
The reason that onMenuOpened() and onPanelClosed() are not called is
that Activity's default implementations of those methods will try and
init the framework Action Bar.

Permanently hide bottom bar

I am working on custom screen lock app where we need to full screen view hiding the top and bottom bars completely. The app is for Android phones only and not tablets. I achieved this partially by using Immersive mode but the issue is the bottom bar & top appears for few seconds on touching bottom or top of the screen.
Below is the code in my activity to do this :
final int flags = 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;
getWindow().getDecorView().setSystemUiVisibility(flags);
I have tried various options but unable to hide the bars permanently. Please advise.