UI Elements are not visible in Fullscreen mode

Question

I'm trying to view a ImageButton (play and pause) when a video is shown in fullscreen mode of Google VR, but they are not visible. The button is visible only in non-fullscreen mode.

The things I've tried:

• Add the view after the fullscreen mode is entered
• Try to leave immersive mode for current decorView
• Changing ImageButtons visibility
• Trying to get the ImageButton to front with bringToFront()

Unfortunately nothing works.