Hi, 

There are bugs in Android, window mechanism.

1. When the application is not in fullscreen: we have a white rectangle at the bottom of the window
2. When the application is in fullscreen, it seems that the Window component height is biggest than screen size, so the bottom is out of the screen..

Here is an example for the first issue:

import QtQuickWindow {
    color: "red"
    visible: true
    title: qsTr("Hello World")
}