We are currently working on an android app to control a drone via bluetooth. The controller UI consists of two joysticks, which are responsible for piloting the drone. A mockup can be found here.
Set screen orientiation in [Activity(...)]: ScreenOrientation = Android.Content.PM.ScreenOrientation.Landscape
Set theme (e.g. no title bar) in [Activity(...)]: Theme = "@android:style/Theme.Black.NoTitleBar"
Set fullscreen in [Activity(...)]: Theme = "@android:style/Theme.Black.NoTitleBar.Fullscreen"