Develop Reference

Android P - Immersive mode when simulating a notch leaves empty space

I have an Android app which uses the immersive sticky mode and it works well on previous versions of Android as well as on Android P, but when turning on the option of simulating a display cutout (notch), the content starts right below the status bar, leaving a blank space.
My code is standard immersive code:
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_STICKY);
Any ideas?
Thank you.

Nevermind, on a real device it's a totally normal behavior, because you don't want fullscreen content to be obscured by the notch (although the iPhone X does it).
Leaving this question for future reference.

We can have full immersive experience if required for devices with display cutout by setting the window layout attribute. This is documented here.
<item name="android:windowLayoutInDisplayCutoutMode" tools:targetApi="o_mr1"> shortEdges</item>
THis solved my problem.

How to hide softkeys in fullscreen mode for Samsung device in Android app

My app has an option to go into fullscreen mode. Users of device Samsung Galaxy S7 Edge report to me that the navigation soft buttons are displayed in this case and do never vanish when the app is in fullscreen.
Here is the code I am using:
getWindow().addFlags(
WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
| WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
mainFrame.setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LOW_PROFILE |
View.SYSTEM_UI_FLAG_FULLSCREEN |
View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY |
View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
);
I have already played around with some of the options but it is hard because I do not own a Samsung device. Can someone with this device tell me the correct settings so navigation soft keys are not displayed in fullscreen mode?

i found something that might be helpfull. It's from Google's Developers site and I think it does exactly what you are looking for. I hope it will be some kind of help.
I think this part in the beginning is what you need but I also provide you a link below for more information:
Android 4.4 (API Level 19) introduces a new SYSTEM_UI_FLAG_IMMERSIVE flag for setSystemUiVisibility() that lets your app go truly "full screen." This flag, when combined with the SYSTEM_UI_FLAG_HIDE_NAVIGATION and SYSTEM_UI_FLAG_FULLSCREEN flags, hides the navigation and status bars and lets your app capture all touch events on the screen.
https://developer.android.com/training/system-ui/immersive.html
EDIT
i found an answer to a similar question with yours and the suggested approach is the following. try adding this to your code. it will do the trick.
int UI_OPTIONS = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
View.SYSTEM_UI_FLAG_FULLSCREEN |
View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY |
View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;
getWindow().getDecorView().setSystemUiVisibility(UI_OPTIONS);
Here is the link to the original: https://stackoverflow.com/a/31483291/8434076

Hidding home button and back button on Android

In styles I've
<item name="android:windowFullscreen">true</item>
<item name="android:windowNoTitle">true</item>
and in the manifest file, in application I've specified my theme, but home button and back button are still visible, what should I do?

You must use Immersive feature of android. Immersive mode will be only working on devices with KitKat and higher. This, what is weird on your side, is fact, that basing on your words, you cannot even get these flags like this:
View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;
(or part of them). If it is this way, then it is looking, that your compileSdkVersion is lower, than it should be. On start I would advise you to update compileSdkVersion.
When you will do this, and you would like to use these flags please in places, where you want to use immersive mode add conditions, that will be looking like this:
if (Build.VERSION.SDK_INT >= VERSION_CODES.KITKAT) {
int UI_OPTIONS = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;
getWindow().getDecorView().setSystemUiVisibility(UI_OPTIONS);
}
Then it should not mess on older OS.

Use the following two way to achieve what you need
getActionBar().setDisplayHomeAsUpEnabled(false) to remove the home
button from the action bar.
ActionBar().setHomeAsUpIndicator(null);
getSupportActionBar().setHomeAsUpIndicator(null);
i prefer you use the first 1

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.

How do I remove the navigation bar from my Android build?

Since the device I am developing has physical buttons, I do not want to see a navigation bar taking up my screen space. Rowboat-android on Beagleboneblack shows the navigation bar by default. Where do I turn it off?
EDIT: I am not developing applications. I am developing a Beaglebone based device. I want to remove the bar globally from the system. Somewhere there should be a code or setting in the Android source.

Found the answer at Building a wireless Android device using BeagleBone Black
Basically I edited device/ti/beagleboneblack/overlay/frameworks/base/core/res/res/values/config.xml file to set this entry:
<bool name="config_showNavigationBar">false</bool>

You should use IMMERSIVE flag like this:
private void hideSystemUI() {
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);
}
For more info, I recommend you to take a look at here.