Troubles with switching windows in Android using QtQuick 2.2 and QQuickView

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Hello!

Im using QtQuick 2.2 qml-files to load them as sources for apps windows. Here is my main.cpp:
@
#include "mainwindow.h"
#include <QApplication>
#include <QSplashScreen>

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

MainWindow w;
//w.show();

return a.exec&#40;&#41;;

}
@

Then in MainWindow I`m initializing UI-elements. Header:
@
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QtNetwork>
#include <QUrl>
#include <QNetworkAccessManager>
#include <QtDebug>
#include <QSettings>
#include <QJsonObject>
#include <QJsonDocument>
#include <QJsonValue>
#include <QUuid>
#include <QtQml>
#include <QtQuick>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget * parent = 0);
~MainWindow();

Q_INVOKABLE void FunctionRequest(); 
Q_INVOKABLE void FunctionRegister();

private:
QQuickView ui;
QObject * root;
QNetworkAccessManager * nam;
QObject * btnLogin;

private slots:
void slotFinished(QNetworkReply*);
};

#endif // MAINWINDOW_H
@

Cpp:
@
#include "mainwindow.h"
#include "rootscreen.h"
#include "registerform1.h"
#include "statics.h"

MainWindow::
MainWindow(QWidget * parent)
: QMainWindow(parent)
{
ui.setSource(QUrl("qrc:/main.qml"));
// setCentralWidget(QWidget::createWindowContainer(&ui));
ui.setResizeMode(QQuickView::SizeRootObjectToView);
ui.show();

root = ui.rootObject();
ui.rootContext()->setContextProperty("window", this);

nam = new QNetworkAccessManager(this);
connect(nam, SIGNAL(finished(QNetworkReply*)), this, SLOT(slotFinished(QNetworkReply*)));

btnLogin = root->findChild<QObject*>("btnMainLogin");

}

void MainWindow::FunctionRequest() {
QObject * etLogin = root->findChild<QObject*>("etMainLogin");
QObject * etPassword = root->findChild<QObject*>("etMainPassword");
btnLogin->setProperty("enabled", "false");

QString getRequest(Statics::host);
getRequest.append("/api/login?");
getRequest.append("login=");
getRequest.append(etLogin-&gt;property("text").toString());
getRequest.append("&");
getRequest.append("password=");
getRequest.append(etPassword-&gt;property("text").toString());
getRequest.append("&");
QSettings settings("settings.ini", QSettings::IniFormat);
getRequest.append("device=");
getRequest.append(settings.value("settings/device").toString());

QNetworkRequest request(QUrl(getRequest.toUtf8()));
QNetworkReply * pnr = nam->get(request);

}

void MainWindow::FunctionRegister() {
new RegisterForm1;
}

void MainWindow::slotFinished(QNetworkReply * pnr) {
if (pnr->error() != QNetworkReply::NoError) {
btnLogin->setProperty("color", "#FFC4C5");
btnLogin->setProperty("enabled", "true");
} else {
btnLogin->setProperty("enabled", "true");
QString resultString = QString::fromUtf8( pnr->readAll() );
QJsonDocument result = QJsonDocument::fromJson(resultString.toUtf8());
QJsonObject mainJson = result.object();
QJsonValue value = mainJson.value("error");
if (value.toString() == NULL) {
mainJson = mainJson.value("done").toObject();
mainJson = mainJson.value("date").toObject();
value = mainJson.value("key"); // Парсим JSON с ответом
QSettings settings("settings.ini", QSettings::IniFormat);

        QString md5device = QString(QCryptographicHash::hash(qPrintable(settings.value("settings/device").toString()), QCryptographicHash::Md5).toHex());
        QString md5response = QString(QCryptographicHash::hash(qPrintable(QString::number(value.toDouble(), 'f', 0)), QCryptographicHash::Md5).toHex());
        QString md5appended = md5device + md5response;
        QString md5total = QString(QCryptographicHash::hash(qPrintable(md5appended), QCryptographicHash::Md5).toHex());

        settings.setValue("settings/key", md5total);
        settings.sync();

        new RootScreen();
    } else {
        btnLogin->setProperty("color", "#FFC4C5");
    }
}
pnr->deleteLater();

}

MainWindow::~MainWindow()
{
delete nam;
delete root;
}
@

But when new window opens (new RegisterForm1), it doesnt render on the screen, and I can see only current window. If well turn off and then turn on screen new window normally appears. It also works while its invisible (TextInputs), but we cant see window itself.

I tried to set QQuickView ui as a central widget and call QMainWindow`s show() function, but then display becomes simply gray and nothing works.

How can I fix this strange behavior on Android devices (on Windows everything works great)? I found exactly same problem`s description as mine in bug report: https://bugreports.qt-project.org/browse/QTBUG-39454 . But there were no any solutions, that I could implement.

p.s. sorry, if my English is very bad(

Gianluca

I don't see any reason in your code to embed a QtQuick view inside a QMainWindow.
So, if there is no special reason for doing that, then do not use QMainWindow and directly show the QtQuick on the screen.
Maybe, in this way you bypass the problem.

? Offline

Gianluca, thank you so much for your answer. I tried solution, that you recommended, but it didn`t help. New screens are invisible still. Also tried to create new QQuickViews in main() method of the application - no result. Terrible frustration(

Gianluca

Please, can you post also the qml code?? So, we can see if there is something wrong there.

? Offline

Of course

main.qml:
@
import QtQuick 2.2

Rectangle {
width: 320
height: 600
color: "#F0F3F6"
Rectangle {
anchors.centerIn: parent
width: parent.width * 2
height: parent.height * 0.45
color:"#FFFFFF"
rotation: -20
Rectangle {
anchors.centerIn: parent
width: parent.width
height: parent.height * 0.95
color:"#3ABDED"
}
}
Text {
anchors.fill: parent
text: "MOBILE\nAQUA"
color: "#FFFFFF"
font.bold: true
font.pixelSize: parent.height * 0.047
font.letterSpacing: parent.height * 0.0025
font.family: "Leelawadee"
horizontalAlignment: Text.AlignHCenter
anchors.leftMargin: parent.width * 0.17
verticalAlignment: Text.AlignVCenter
}
Image {
source: "aqua.png"
x:parent.width * 0.5 - width * 2
y:parent.height * 0.5 - height / 2
height: parent.height * 0.115
width: height / 1.4375
}
MouseArea {
anchors.fill: parent
onClicked: {
mainScreen.visible = true;
}
}

Rectangle {
    id: mainScreen
    anchors.fill: parent
    color: "#F0F3F6"
    visible: false
EditText {
    id: etLogin
    anchors.horizontalCenter: parent.horizontalCenter
    y: parent.height * 0.4
    EditText_get_setText {
        id: etLoginText
        objectName: "etMainLogin"
        text: "+7 (xxx) xxx xx xx"
        inputMethodHints: Qt.ImhFormattedNumbersOnly
        validator: RegExpValidator {
            regExp: /^((8|\+7)[\-]?)?(\(?\d{3}\)?[\-]?)?[\d\-]{7,10}$/
        }
        onActiveFocusChanged: {
            if (etLoginText.focus == false) {
                if (etLoginText.text == "") {
                    etLoginText.text = "+7 (xxx) xxx xx xx"
                    etLoginText.color = "#F0F3F6"
                }
            } else {
                etLoginText.color = "#000000"
            }
        }
        Keys.onPressed: {
            if (event.key == Qt.Key_Return || event.key == Qt.Key_Enter) {
                etLogin.focus = false;
                etPasswordText.focus = true;
                etPasswordText.color = "#000000"
                if (etPasswordText.text == "**********") {
                    etPasswordText.text = "";
                }
                event.accepted = true;
            }
        }
        EditText_onClick {
            onClicked: {
                if (etLoginText.text == "+7 (xxx) xxx xx xx") {
                    etLoginText.text = "";
                }
            }
        }
    }
}

EditText {
    id: etPassword
    anchors.horizontalCenter: parent.horizontalCenter
    y: parent.height * 0.515
    EditText_get_setText {
        id: etPasswordText
        objectName: "etMainPassword"
        text: "**********"
        echoMode: TextInput.Password
        inputMethodHints: Qt.ImhPreferLatin
        validator: RegExpValidator {
            regExp: /[a-zA-Z0-9]{1,32}/
        }
        Keys.onPressed: {
            if (event.key == Qt.Key_Return || event.key == Qt.Key_Enter) {
                etPasswordText.focus = false;
                Qt.inputMethod.hide();
            }
        }
        onActiveFocusChanged: {
            if (etPasswordText.focus == false) {
                if (etPasswordText.text == "") {
                    etPasswordText.text = "**********"
                    etPasswordText.color = "#F0F3F6"
                }
            } else {
                etPasswordText.color = "#000000"
            }
        }
        EditText_onClick {
            onClicked: {
                if (etPasswordText.text == "**********") {
                    etPasswordText.text = "";
                }
            }
        }
    }
}

Label {
    text: "АВТОРИЗАЦИЯ"
    anchors.horizontalCenter: parent.horizontalCenter
    y: parent.height * 0.165
}

Link {
    text: "Зарегистрироваться?"
    anchors.horizontalCenter: parent.horizontalCenter
    y: parent.height * 0.69
}

Button {
    id: btnLogin
    objectName: "btnMainLogin"
    anchors.horizontalCenter: parent.horizontalCenter
    y: parent.height * 0.83
    Button_setText {
        text: "Войти"
    }
    MouseArea {
        id: btnLoginArea
        anchors.fill: parent
        onPressed: btnLogin.color = "#A8DEEC"
        onReleased: btnLogin.color = "#3ABDED"
        onClicked: {
            if ((etLoginText.text == "") || (etPasswordText.text == "")
                    || (etLoginText.text == "+7 (xxx) xxx xx xx") || (etPasswordText.text == "**********")) {
                etLogin.color = "#FFC4C5"
                etPassword.color = "#FFC4C5"
            } else {
                window.FunctionRequest()
                etLogin.color = "#ffffff"
                etPassword.color = "#ffffff"
            }
            etLoginText.focus = false;
            etPasswordText.focus = false;
            etLoginText.closeSoftwareInputPanel();
            etPasswordText.closeSoftwareInputPanel();
        }
    }
}

}
}
@

? Offline

EditText.qml:
@
import QtQuick 2.2

Rectangle {
width: 0.8 * parent.width
height: 0.073 * parent.height
color: "#FFFFFF"
}
@

EditText_get_setText.qml:
@
import QtQuick 2.2

TextInput {
color: "#F0F3F6"
selectionColor: "#3ABDED"
anchors.fill: parent
anchors.topMargin: 0.2 * parent.height
anchors.leftMargin: 0.05 * parent.width
font.pixelSize: 0.5 * parent.height
font.bold: true
width: parent.width - parent.width * 0.075
height: parent.height
selectByMouse: true
readOnly: false
}
@

EditText_onClick.qml:
@
import QtQuick 2.2

MouseArea {
anchors.fill: parent
onClicked: parent.color = "#000000",
parent.focus = false,
parent.focus = true
}
@

Button.qml:
@
import QtQuick 2.2

Rectangle {
id: btn
width: 0.8 * parent.width
height: 0.085 * parent.height
color: "#3ABDED"
MouseArea {
anchors.fill: parent
onPressed: btn.color = "#A8DEEC"
onReleased: btn.color = "#3ABDED"
}
}
@

Button_setText.qml:
@
import QtQuick 2.2

Text {
anchors.centerIn: parent
font.pixelSize: 0.5 * parent.height
color: "#FFFFFF"
}
@

Label.qml:
@
import QtQuick 2.2

Text {
font.pixelSize: 0.046 * parent.height
color: "#000000"
font.bold: true
}
@

Link.qml:
@
import QtQuick 2.2

Text {
font.pixelSize: 0.03 * parent.height
color: "#3ABDED"
font.underline: true
verticalAlignment: Text.AlignVCenter
height: 0.1 * parent.height
MouseArea {
anchors.fill: parent
onPressed: color = "#A8DEEC"
onReleased: color = "#3ABDED"
onClicked: {
window.FunctionRegister();
}
}
}
@

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Upd: tested on iOS - everything works great. This trouble appears only in Android.

? Offline

Decided to use QQmlApplicationEngine. topic closed.