I tried turning it off with this code below, but no success thus:
B4X:
Dim Player As SimpleExoPlayer
Dim PlayerView As SimpleExoPlayerView
PlayerView = pnl.GetView(0).GetView(0) 'I also changed it to: pnl.GetView(1).GetView(0), but it didnt work
PlayerView.UseController = False 'now turn off usecontroller
Player = PlayerView.Tag
Player.Play