Pixel 3 XL "Back button" and "fullScreen - Status bar" issue

I am starting a new thread because I didn't find any solution to my problems.

My AIR android application is working fine on my "Samsung galaxy s6 edge" but is not working properly on my "Pixel 3 XL".

There are 2 issues I am facing right now which are the following:

1- After using all solutions I am unable to have a fullScreen app on Pixel 3 XL (not showing on status bar). The app is working fullScreen with status bar on Samsung galaxy s6 edge. I used the solution like the following tag

<fullScreen>true</fullScreen

under the initialWindow tag in app.xml.

2- Android back button is working fine on my Samsung galaxy s6 edge but doesn't work on my Pixel 3 XL phone. I am using the following line of code to register a listener for the back button:

NativeApplication.nativeApplication.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown, false, 0, true);

I think both issues are related to new Android versions i.e. Android 8 or above. Or maybe adobe air doesn't support Android new versions yet.

Kindly let me know if someone knows the solution to my problems.