You start from here:
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It should work from API 21 to 28
Sample APP that we have implemented fullscreen as service, but with Keyboard and BackButton not functioning during fullscreen: [login to view URL]
IMPORTANT feature that I need: During fullscreen the <keyboard, home button and back button> must be functional. The <show keyboard and back button> functionality during fullscreen(nav bar and status bar hidden) is the main objective for this project.
In order to be hired I need a demo video to prove that is working and a functional APK. Thank You. We can chat anytime