How to make android notification using c++

[AmrCoder]

I want to make an android notification so i link a java class to use QAndroidJni to make that
java class

package org.qtproject.example;

import android.app.Notification;
import android.app.NotificationManager;
import android.content.Context;

public class NotificationClient extends org.qtproject.qt5.android.bindings.QtActivity
{
    private static NotificationManager m_notificationManager;
    private static Notification.Builder m_builder;
    private static NotificationClient m_instance;

    public NotificationClient()
    {
        m_instance = this;
    }

    public static void notify(String s)
    {
        if (m_notificationManager == null) {
            m_notificationManager = (NotificationManager)m_instance.getSystemService(Context.NOTIFICATION_SERVICE);
            m_builder = new Notification.Builder(m_instance);
            m_builder.setContentTitle("A message from Qt!");
        }

        m_builder.setContentText(s);
        m_notificationManager.notify(1, m_builder.build());
    }
}

I got this java class from an example in Qt but it used with QML
i link this to my .pro file

QT       += core gui androidextras

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = TestNofi
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp \
    notificationclient.cpp

HEADERS  += mainwindow.h \
    notificationclient.h

FORMS    += mainwindow.ui

CONFIG += mobility
MOBILITY = 

DISTFILES += \
    android/AndroidManifest.xml \
    android/gradle/wrapper/gradle-wrapper.jar \
    android/gradlew \
    android/res/values/libs.xml \
    android/build.gradle \
    android/gradle/wrapper/gradle-wrapper.properties \
    android/gradlew.bat \
    android/src/org/qtproject/example/NotificationClient.java // here added

ANDROID_PACKAGE_SOURCE_DIR = $$PWD/android

i add this class
.h

#ifndef NOTIFICATIONCLIENT_H
#define NOTIFICATIONCLIENT_H

#include <QObject>

class NotificationClient : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString notification READ notification WRITE setNotification NOTIFY notificationChanged)
public:
    explicit NotificationClient(QObject *parent = 0);

    void setNotification(const QString &notification);
    QString notification() const;

signals:
    void notificationChanged();

private slots:
    void updateAndroidNotification();

private:
    QString m_notification;
};

#endif // NOTIFICATIONCLIENT_H

.cpp

#include "notificationclient.h"

#include <QtAndroidExtras/QAndroidJniObject>

NotificationClient::NotificationClient(QObject *parent)
    : QObject(parent)
{
    connect(this, SIGNAL(notificationChanged()), this, SLOT(updateAndroidNotification()));
}

void NotificationClient::setNotification(const QString &notification)
{
    if (m_notification == notification)
        return;

    m_notification = notification;
    emit notificationChanged();
}

QString NotificationClient::notification() const
{
    return m_notification;
}

void NotificationClient::updateAndroidNotification()
{
    QAndroidJniObject javaNotification = QAndroidJniObject::fromString(m_notification);
    QAndroidJniObject::callStaticMethod<void>("org/qtproject/example/NotificationClient",
                                       "notify",
                                       "(Ljava/lang/String;)V",
                                       javaNotification.object<jstring>());
}

i use it in my mainwindow like that

void MainWindow::on_pushButton_clicked()
{
    qDebug() << "Is Class Avlibale = " << QAndroidJniObject::isClassAvailable("org/qtproject/example/NotificationClient"); // return true
    client->setNotification("Hello world Android Nofication");
}

but when deploy it on my android phone i don't get any notification that is what i try.
so what should i do to make a notification using c++ i hope there something easy as i make a toast using qt 5.7 no need to use a java class like this

void showToast(const QString &message, Duration duration) {
    // all the magic must happen on Android UI thread
    QtAndroid::runOnAndroidThread([message, duration] {
        QAndroidJniObject javaString = QAndroidJniObject::fromString(message);
        QAndroidJniObject toast = QAndroidJniObject::callStaticObjectMethod("android/widget/Toast", "makeText",
                                                                            "(Landroid/content/Context;Ljava/lang/CharSequence;I)Landroid/widget/Toast;",
                                                                            QtAndroid::androidActivity().object(),
                                                                            javaString.object(),
                                                                            jint(duration));
        toast.callMethod<void>("show");
    });
}

or any other way to do that
Thanks in Advance

[AmrCoder]

finally, I found the solution is to add the package/Java class
in the activity section in android manifest .xml file and no need to use the org.qtproject.qt5.android.bindings.QtActivity because the notification file already extends this class
so change android:name in activity section in android .xml
with the java class (pakacge.class.java)
this what I understand and works with me I hope it helps