TextField and keyboard on Android

[Skroopa]

Any ideas? Why so simple and important function don't work?

#include <QtQuick>

#ifdef QT_WEBVIEW_WEBENGINE_BACKEND
#include <QtWebEngine>
#endif
#include "CameraAndroid.h"
#include "JNINative.h"

int main(int argc, char *argv[]) {

    QGuiApplication a(argc, argv);

#ifdef Q_OS_OSX
    // On OS X, correct WebView / QtQuick compositing and stacking requires running
    // Qt in layer-backed mode, which again resuires rendering on the Gui thread.
    qWarning("Setting QT_MAC_WANTS_LAYER=1 and QSG_RENDER_LOOP=basic");
    qputenv("QT_MAC_WANTS_LAYER", "1");
    qputenv("QSG_RENDER_LOOP", "basic");
#endif
#ifdef QT_WEBVIEW_WEBENGINE_BACKEND
    QtWebEngine::initialize();
#endif // QT_WEBVIEW_WEBENGINE_BACKEND

    QQuickView view;
    view.setSource(QUrl("qrc:/main.qml"));
    view.setFlags(Qt::FramelessWindowHint|Qt::WindowStaysOnTopHint|Qt::WindowTitleHint);
    view.setFlags(view.flags() | static_cast<Qt::WindowFlags>(Qt::WA_TranslucentBackground));
    view.setResizeMode(QQuickView::SizeRootObjectToView);
    view.setColor(QColor(Qt::transparent));
    view.showFullScreen();
    QObject::connect(view.rootContext()->engine(), SIGNAL(quit()), QGuiApplication::instance(), SLOT(quit()));

    return a.exec();
}

I post here code from main program. May be this can help to handle problem.

Update
Also tried to use TextInput, but no keyboard...

[clochydd]

@Skroopa Initially you should put it in your Rectangle:

Rectangle {
    color: "#00000000"

    TextField {
        id: myText
        anchors.centerIn: parent
        //....
    }
    Component.onCompleted: {
        myText.forceActiveFocus();
    }
}

And if the activefocus is changed later in your program you should restore it:

myText.forceActiveFocus()

Hope, it helps

[Skroopa]

Thanks for your help, but... Keyboard isn't visible. I can't understand, where is the problem, because program absolutely simple.

[A Former User]

The following works for me on Android 4.3. Does it work for you?

main.cpp

#include <QGuiApplication>
#include <QQmlApplicationEngine>

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    return app.exec();
}

main.qml

import QtQuick 2.6
import QtQuick.Controls 1.5

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

    Rectangle {
        color: "#00000000"
        anchors.fill: contentItem

        TextField {
            anchors.centerIn: parent
        }
    }

    Button {
        anchors.bottom: contentItem.bottom
        text: "Exit"
        onClicked: Qt.quit()
    }
}

[Skroopa]

@Wieland God bless you, sir! It works,
but only if you are using ApplicationWindow... It's a bug?
I think, we found the right path!

Update:
The main feature of my application, that QML GUI draws over Android's SurfaceView. Qt don't provide any tools to use Android's MediaCodec-s and I must to use Qt::WA_TranslucentBackground and Qt::WindowStaysOnTopHint flags to achive "layer-cake" like app.
But if I use this flags, TextField / TextInput doesn't show keyboard anymore ))))):
Is it possible to show keyboard or I must write my own keyboard widget?

[Skroopa]

Simple example:

#include <QtQuick>

int main(int argc, char *argv[]) {

    QGuiApplication a(argc, argv);

    QQuickView view;
    view.setSource(QUrl("qrc:/main.qml"));
    view.setFlags(Qt::WindowStaysOnTopHint | static_cast<Qt::WindowFlags>(Qt::WA_TranslucentBackground));
    view.showFullScreen();

    QObject::connect(view.rootContext()->engine(), SIGNAL(quit()), QGuiApplication::instance(), SLOT(quit()));

    return a.exec();
}

Setting any flags to QQuickView makes TextField unfocusable and keyboard never shows on Android (not tested on iOS). Is it possible way to solve trouble with keyboard?
I think, it is very important bug.

UPDATE
Also, I tried this:

view.setFlags(view.flags());

result the same - no keyboard. I'm sure - it's a bug.
Please, someone, help. Project is stuck.

[A Former User]

I don't think it's a bug. The Qt::WindowStaysOnTopHint flag forbids the keyboard "window" to come up. Maybe you can work around it by removing this flag everytime before the keyboard shall be shown.

[Skroopa]

Okay, after week I found the next strange things of ApplicationWindow, when I set flags: Qt.WindowStaysOnTopHint to it:

1. ApplicationWindow now is inactive, i.e. ApplicationWindow.active == false. requestActivate() doesn't help - active is false anyway.
2. ApplicationWindow's activeFocusItem == null.

There is two reasons, why keyboard doesn't show on Android after touching to TextField.
Any ideas, how to fix that? Thanks.

[Skroopa]

Tried this:

    QGuiApplication a(argc, argv);
    QQmlApplicationEngine engine(QUrl(QStringLiteral("qrc:/main.qml")));

    for(int i = 0; i < a.allWindows().size(); i++) {
        if(a.allWindows()[i]->objectName() == "mainWindow") {
            a.allWindows()[i]->requestActivate();
            break;
        }
    }

Without results... a.focusWindow() is NULL. Can anyone help to me?
ApplicationWindow is fullscreen and has width and height equal Screen size.
Spent for this problem more than 2 weeks - no help in any forum...

P.S. on Windows OS all works perfectly - window activates and focusWindow() is not NULL (gives me ApplicationWindow_QMLTYPE_73(0x6335590, name="mainWindow"))

[Skroopa]

Done!

    for(int i = 0; i < a.allWindows().size(); i++) {
        if(a.allWindows()[i]->objectName() == "mainWindow") {
            a.allWindows()[i]->close();
            a.allWindows()[i]->setFlags(static_cast<Qt::WindowFlags>(a.allWindows()[i]->flags()) | Qt::WindowStaysOnTopHint);
            a.allWindows()[i]->show();
            a.allWindows()[i]->showFullScreen();
            break;
        }
    }

and keyboard is showing now! Hell, yeah!
Also, you must not set any flags to ApplicationWindow in QML code, otherwise keyboard will be hidden.

[A Former User]

@Skroopa Congrats! Looks like you're the first guy on the planet who found out how this works. Hats off!

[Skroopa]

@Wieland Ha-ha! (:
Someone today would be drunk...

[RichardLiu]

when the window inactive, just raise it

onActiveChanged:{
if(!rootWin.active){
rootWin.raise()
console.log("rootWin raise")
}
}