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How to ask permission or automatically set the phone's full screen on settings - android studio

I am trying to set my activity to full screen using this code below:
private void hideSystemUI() {
View decorView = getWindow().getDecorView();
decorView.setSystemUiVisibility(
View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
| 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);
}
But I am getting a black color navigation bar on certain phones because of the condition on settings -> display where certain phones need to permit apps to use a fullscreen mode. To address this issue I decided that I need to implement a permission checker when the activity inflates. If there is another way please tell me and I will try to implement it.
Edit:
Here is the link of the conditions for phones that I am talking about:
https://www.gottabemobile.com/how-to-enable-full-screen-apps-on-galaxy-s10/

this problem happen with me for 2 different devices and this because of the front camera notch or screen cutout.
I used this code in oncreate() :
hideSystemUI();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
getWindow().getAttributes().layoutInDisplayCutoutMode =
WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES; }
Or in the theme style xml file add this line :
<item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>

In your manifest file put
android:theme="#style/Theme.Design.NoActionBar"
or
android:theme="#style/AppTheme"
and in your activity call hideSystemUI(); before setting the content view
like 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);
setContentView(R.layout.activity_main);

Enter android immersive mode

I need to enter android immersive mode in my react-native app, but when I try View.SYSTEM_UI_FLAG_IMMERSIVE) I got a lot of errors during compilation. I don't know anything about native android development and do it blindfold. So can you please briefly explain what and where I need to past to make it work.

I need only to automatically hide android navigation buttons on app start so it's enough to add few lines of code in MainActivity.java:
#Override
protected void onStart()
{
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 // прячем панель навигации
| View.SYSTEM_UI_FLAG_FULLSCREEN // прячем строку состояния
| View.SYSTEM_UI_FLAG_IMMERSIVE);
super.onStart();
}

what about adding android:theme="#android:style/Theme.NoTitleBar.Fullscreen" in your android manifest xml file??

How to hide the navigation bar in Android 6.0?

I have the following 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);
This code worked fine for Android Lollipop, hiding the navigation bar in sticky immersive mode. But now, when I test it on my phone with Android 6.0, the navigation bar goes away while a black rectangle where the navigation bar used to be remains, blocking a portion of the screen.

Looking back on my question, I'd like to add the solution I'm using now which hasn't failed me since, I don't remember if I saw it somewhere else or came to it myself but I'm glad it works.
public static void activiateFullscreen(Activity activity){
View decorView = activity.getWindow().getDecorView();
int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
if (Build.VERSION.SDK_INT >= 17) {
uiOptions ^= View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_FULLSCREEN
|View.SYSTEM_UI_FLAG_LOW_PROFILE;
}
if (Build.VERSION.SDK_INT >= 19) {
uiOptions ^= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
}
decorView.setSystemUiVisibility(uiOptions);
}
Hope this helps someone!

I've discovered a workaround that seems to resolve this issue. I support portrait and landscape, and noticed that the black rectangle went away if I rotated into landscape or started the app in landscape. Adding the following code to my main activity's onCreate() method (after setting the immersive flags) resolved the issue:
if (Build.VERSION.SDK_INT >= 23) {
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR);
}

How to change fullscreen mode in settings activity android?

I want to change fullscreen mode in settings and see the changes after backing from settings to main activity.
I tried:
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
But I can't use it after setting content view of main activity. I tried also:
WindowManager.LayoutParams attrs = mActivity.getWindow().getAttributes();
attrs.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN;
mActivity.getWindow().setAttributes(attrs);
but i can't use it in onResume() because my app is unable to resume activity throwing null pointer exception at the first open.
Do you have any idea how to do fullscreen setting with changes being seen after resuming to main activity?

Api level 11+
getActionBar.hide();
below Api level 11
you can use getSupportActionBar.hide(); and add v7 support lib to your project

If you are using recent Android (4.4) you can try by adding this to onResume()
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 your AndroidManifest.xml
<activity
android:name=".YourSettingsActivity"
android:label=""
android:theme="#android:style/Theme.Holo.NoActionBar.FullScreen"
android:screenOrientation="portrait" >
</activity>

Try this
WindowManager.LayoutParams attrs = getWindow().getAttributes();
attrs.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN;
getWindow().setAttributes(attrs);

Fullscreen on Nexus devices using libgdx

Does anyone know how to go fullscreen using libgdx, where the virtual home key buttons on devices such as Nexus are also not visible?

In case anyone finds this like I did while looking for a simple fix you can use
config.useImmersiveMode = true;
on the AndroidApplicationConfiguration object on 4.4 and up to hide the soft keys in addition to the statusbar (which is hidden by default).
UPDATE: The line belongs in android/src/YOUR/PACKAGE/PATH/android/AndroidLauncher.java

libgdx does this for you by default via AndroidApplicationConfiguration#hideStatusBar. However, you can still set to fullscreen.
In the android game project's main activity class:
public class MainActivity extends AndroidApplication {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
AndroidApplicationConfiguration cfg = new AndroidApplicationConfiguration();
//cfg.hideStatusBar = true; //set to true by default
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB){
getWindow().getDecorView().setSystemUiVisibility(View.STATUS_BAR_VISIBLE);
getWindow().getDecorView().setSystemUiVisibility(View.STATUS_BAR_HIDDEN);
}
initialize(new MainClass(), cfg);
}
}
I realized there's a bug where the buttons on the status bar becomes visible after resuming from a locked screen. The workaround is to either use handler to listen(setOnSystemUiVisibilityChangeListener) for system UI visibility changes and then re-hide the UI if it becomes visible or show the status bar before hiding it as I've done above.
Also View.STATUS_BAR_HIDDEN (API v11) was renamed to View.SYSTEM_UI_FLAG_LOW_PROFILE (API v14) which turns the virtual nav buttons into dots. However, both map to the same constant 0x1. Also, as soon as the screen is touched again the buttons will become visible .
If you want to remove the status bar entirely, use View.SYSTEM_UI_FLAG_HIDE_NAVIGATION (API v14) and Build.VERSION_CODES.ICE_CREAM_SANDWICH

What you should do is set System Ui Visibility in onResume()
getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);

Tried many things and only this code succeeded for me:
...
AndroidApplicationConfiguration cfg = new AndroidApplicationConfiguration();
cfg.useGL20 = false;
requestWindowFeature(Window.FEATURE_NO_TITLE);
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);
initialize(new Soldiers(), cfg);
This is part of MainActivity.java and probably should be executed also on onResume().