Develop Reference

Android: Never show Support Action Bar

There is a way to completly hide the support action bar, even if the user scroll down from top to bottom? Never show it.
This solution works but only temporary
getSupportActionBar().hide();
I've tried also:
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);
and
android:theme="#style/Theme.AppCompat.NoActionBar"
or similar.
When the user scroll down, the bar re-appear.
I need it because i'm making my personal launcher and I've got my personal support action bar

When the user scroll down, the bar re-appear.
It seems to me it's not available to completely disable/hide status bar.
From SYSTEM_UI_FLAG_IMMERSIVE_STICKY docs:
When system bars are hidden in immersive mode, they can be revealed temporarily with system gestures, such as swiping from the top of the screen. These transient system bars will overlay app’s content, may have some degree of transparency, and will automatically hide after a short timeout.

Use this
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

Force Android system ui to hide

I'm having trouble with Android's immersive sticky layout.
Under some circumstances, usual transparent status bar with home, back and multitask buttons becomes non-transparent visible, and even if I set right visibility flags back on, the non-transparent bar stays on screen.
Is there some programming way to force system UI to hide, and preferably to become transparent again?

I am using this method to hide the system UI in my app:
protected void hideSystemUI() {
View decorView = getWindow().getDecorView();
int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_IMMERSIVE;
decorView.setSystemUiVisibility(uiOptions);
}

How to disable naviagation bar in Android LockScreen App like CM locker and OS8 lock screen

I tried setting systemUIView(View.GONE) and use Immersive Full-Screen Mode. But users can always get the naviagtion bar back by touching the bottom of the screen. The apps i mentioned above are able to hide it without root or setting default launcher.

Okay, I found a solution finally and here is how it's done:
Use SYSTEM_UI_FLAG_IMMERSIVE_STICKY to hide the navigation bar as follow, you may put the code inside onResume of your activity
View decorView = getWindow().getDecorView();
int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
decorView.setSystemUiVisibility(uiOptions);
Then, add a system error window using WindowManger and overlay it on top of everything
you can put this unescapable view anywhere you like, but if you want to do it while users locked the screen, add this flag:
getWindow().setFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED, WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
Et voilà

Well I've never achieved this but it seems that you will need to set some other flags to get this kind of view :
When you use the SYSTEM_UI_FLAG_IMMERSIVE flag, it hides the system bars based on what other UI flags you have set (SYSTEM_UI_FLAG_HIDE_NAVIGATION, SYSTEM_UI_FLAG_FULLSCREEN, or both). When the user swipes inward in a system bars region, the system bars reappear and remain visible.
Here is a snippet that you can use to set these flags :
// This snippet hides the system bars.
private void hideSystemUI() {
// Set the IMMERSIVE flag.
// Set the content to appear under the system bars so that the content
// doesn't resize when the system bars hide and show.
mDecorView.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);
}
// This snippet shows the system bars. It does this by removing all the flags
// except for the ones that make the content appear under the system bars.
private void showSystemUI() {
mDecorView.setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
}
For more information go check Using Immersive Full-screen Mode from the android developer website.
Hope this help.

Android kiosk mode app - running status bar

I've got a problem with status bar in kiosk mode App.
I want to know how to hide status bar and I know that is it possible to disable it permanently in 4.4.2 Kitkat? But I found nice app -KioWare.
There is cool mode when I grab status bar down, it is running back to the top very quickly. In 0.05 sec. I am not able to click anything. And this is what I'm looking for.
I can't buy this app because it's to expensive and I only need this magic trick with status bar. Anyone can help me ? It should be only few lines of code.

I wrote an article that covers this question, but specifically for Lollipop. I'm not sure if the immersive mode in Android 5 will also apply for 4.4.2, but it's something to try out maybe?
http://www.sureshjoshi.com/mobile/android-kiosk-mode-without-root/
#Override
protected void onResume() {
super.onResume();
hideSystemUI();
}
// This snippet hides the system bars.
private void hideSystemUI() {
// Set the IMMERSIVE flag.
// Set the content to appear under the system bars so that the content
// doesn't resize when the system bars hide and show.
mDecorView.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);
}

Hide Navigation Bar Permanently

I've followed this thread to hide Navigation bar:
Hide ICS back home task switcher buttons
Works fine when the Activity starts, but whenever I press anywhere on the screen the Navigation bar appears again. I've tried this on an empty Activity without any "views" except the Content View.
How can I hide it throughout the duration of my Activity without having to add some kind of Timer or a Thread to just hide it every millisecond?
It would be great to gain some extra screen size or be able to customize my own Navigation Bar throughout my App.
if( Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH )
getWindow().getDecorView().setSystemUiVisibility( View.SYSTEM_UI_FLAG_HIDE_NAVIGATION );
else if( Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB )
getWindow().getDecorView().setSystemUiVisibility( View.STATUS_BAR_HIDDEN );

This is a problem that came in a long time when we need to show som content in full screen, bumped the difficulty in being able to hide the status bar on some versions of Android:
Finally Google’s latest Android OS, KitKat, introduces a decent user-friendly tool that gives us ownership of that last bit of screen.
Using Immersive Full-Screen Mode see more in : https://developer.android.com/training/system-ui/immersive.html
// This snippet hides the system bars.
private void hideSystemUI() {
// Set the IMMERSIVE flag.
// Set the content to appear under the system bars so that the content
// doesn't resize when the system bars hide and show.
mDecorView.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);
}
// This snippet shows the system bars. It does this by removing all the flags
// except for the ones that make the content appear under the system bars.
private void showSystemUI() {
mDecorView.setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
}
Here's how this has been a thorn in : http://blog.grio.com/2014/02/androids-hiding-of-the-system-bar-fixed.html