Code

import QtQuick
import QtQuick.Dialogs

Window {
    width: 640
    height: 480
    visible: true

    MessageDialog {
        id: dlg
        title: "Error"
        text: "You can't close me"
        buttons: MessageDialog.Ok | MessageDialog.Cancel
        onAccepted: console.log("Yea")
        onRejected: console.log("Nay")
    }

    Component.onCompleted: dlg.open()
}

Expected outcomes when clicking a button (Windows/Linux)

• The debug output prints "Yea" or "Nay", depending on which button was clicked
• The dialog disappears

Actual outcomes when clicking a button (Android)

• Nothing happens

Partial workaround

If we use import Qt.labs.platform instead of import QtQuick.Dialogs then the dialog does disappear. However, the onAccepted/onRejected handlers still don't seem to be run.