Android: Qml window is flickering when toggling full-screen mode

As mentioned in title, Qml Window will flick while toggling full-screen mode.

Steps to reproduce:

1. Download the application and unpack it
2. Run application on emulator or android device
3. Press toggle full-screen button. The qml window will flick at the bottom and top

Expected behaviour:

No flicking

What actually happens:

Every time the full-screen mode is toggled, the one can see flickering.