Impossible to detect keyboard visibility/size when using WebView on Android

[daljit97]

So I am trying to find a way to detect whether the keyboard is visible in my Android application (Qt 5.11 on Linux, testing on Oreo). I have managed to do this partially using Qt.inputMethod.visible and also get the height with Qt.inputMethod.height. However, there is a big problem with this approach: it does not seem to work within a Qml WebView. When the use is visiting a webpage and hit a textfield, the previous method return 0 and hence I am unable to work out whether the keyboard is shown or not. Here is a sample code to reproduce the problem:

import QtQuick 2.4
import QtQuick.Controls 1.3
import QtQuick.Window 2.2
import QtQuick.Dialogs 1.2
import QtWebView 1.0

ApplicationWindow {
    title: qsTr("Hello World")
    width: 640
    height: 480
    visible: true

    Item{
        anchors.fill: parent
        WebView{
            id: webView
            url: "https://google.com"
            anchors.top: labelOut.bottom; anchors.bottom: parent.bottom
            anchors.left: parent.left; anchors.right: parent.right
        }
        Label {
            id: labelOut
            text: "Virtual Keyboard Visible: " + Qt.inputMethod.visible + " height: " + Qt.inputMethod.keyboardRectangle.height
            anchors.leftMargin: 4
            anchors.left: parent.left
            anchors.top: parent.top
            color: "black"
        }

    }
}