In QML, Rectangle components with a color property that includes an alpha value do not display correctly on Android.

import QtQuick
Window {
    visible: true    
    Rectangle {
        id : rect1
        width: 100
        height: 100
        anchors.centerIn: parent        
        color: Qt.rgba(1, 0, 0, 0.5)
    }    
    
    Rectangle {
        id : rect2
        antialiasing: false
        width: 100
        height: 100
        anchors.bottom: parent.bottom
        color: Qt.rgba(1, 0, 0, 1)
    }
}