JNI function not working in qml

gotronics

androidBatteryStateChanged(level, onCharge)

not working qml file please assist me

project file :

QT += qml quick androidextras

SOURCES += main.cpp
androidbatterystate.cpp

RESOURCES += qml.qrc

OTHER_FILES +=
android/AndroidManifest.xml
android/src/com/falsinsoft/example/batterylevel/AppActivity.java
android/src/com/falsinsoft/example/batterylevel/BatteryLevelListener.java

ANDROID_PACKAGE_SOURCE_DIR = $$PWD/android

DISTFILES +=

HEADERS +=
androidbatterystate.h

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

header file:

#ifndef ANDROIDBATTERYSTATE_H
#define ANDROIDBATTERYSTATE_H
#include <QtAndroidExtras>
#include <QObject>
#include <jni.h>
class AndroidBatteryState : public QObject
{
Q_OBJECT

public:
explicit AndroidBatteryState(QObject *parent = nullptr);

signals:
void BatteryLevel(int level, bool onCharge);

public slots:
void InitializeForAndroid();

private:

};

#endif // ANDROIDBATTERYSTATE_H

//+++++++++++++++++++++++++++++++++++++++++++++++

source file:

#include "androidbatterystate.h"

AndroidBatteryState::AndroidBatteryState(QObject *parent) : QObject(parent)
{

}

void AndroidBatteryStateChanged(JNIEnv *env, jobject thiz, jint level, jboolean onCharge)
{
Q_UNUSED(env)
Q_UNUSED(thiz)
qDebug()<< "Battery Charge: "<< level << "%";

}

void AndroidBatteryState::InitializeForAndroid()
{
JNINativeMethod methods[] = {
{
"BatteryStateChanged",
"(IZ)V",
reinterpret_cast<void*>(AndroidBatteryStateChanged)
}
};

QAndroidJniObject javaClass("com/falsinsoft/example/batterylevel/BatteryLevelListener");
QAndroidJniEnvironment env;

jclass objectClass = env->GetObjectClass(javaClass.object<jobject>());

env->RegisterNatives(objectClass,
    methods,
    sizeof(methods) / sizeof(methods[0]));
env->DeleteLocalRef(objectClass);

QAndroidJniObject::callStaticMethod<void>("com/falsinsoft/example/batterylevel/BatteryLevelListener", "InstallBatteryListener");

qDebug()<< "Initialized";

}

//+++++++++++++++++++++++++++++++++++++++++++++++++

main ccp file:

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QtAndroidExtras>
#include "androidbatterystate.h"
#include <QQmlContext>

int main(int argc, char *argv[])
{
QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
QGuiApplication app(argc, argv);
AndroidBatteryState androidbatterystate;
QQmlApplicationEngine engine;
engine.rootContext()->setContextProperty("BatteryState",&androidbatterystate);

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

   if (engine.rootObjects().isEmpty())
       return -1;

androidbatterystate.InitializeForAndroid();

return app.exec();

}

//+++++++++++++++++++++++++++++++++++++++++++++++++++++++

main qml file:

import QtQuick 2.7
import QtQuick.Controls 2.1
import QtQuick.Controls.Material 2.1
import QtQuick.Window 2.2
import QtQuick.Layouts 1.3

Window {
visible: true
width: 640
height: 480
title: qsTr("Android Battery Level")
color: "blue"
id: root
function androidBatteryStateChanged(level, onCharge)
{

    batteryLevel.text = "Battery level: " + level + "%";
    batteryStatus.text = "On charging: " + (onCharge ? "Yes" : "No");
}



Column {
    anchors.centerIn: parent
    spacing: 20
    Label {

        font.pixelSize: 20
        color: "white"
        text: "Battery Level"
    }
    Label {
        id: batteryLevel
        font.pixelSize: 20
        color: "white"

    }
    Label {
        id: batteryStatus
        font.pixelSize: 20
        color: "white"

    }
}

}

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++
AppActivity class

package com.falsinsoft.example.batterylevel;

import android.app.Activity;

public class AppActivity extends org.qtproject.qt5.android.bindings.QtActivity
{
public AppActivity()
{
BatteryLevelListener.Init(this);
}
}
//+++++++++++++++++++++++++++++++++

BatteryLevelListener class

package com.falsinsoft.example.batterylevel;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.IntentFilter;
import android.content.Intent;
import android.os.BatteryManager;
import android.content.Context;

public class BatteryLevelListener
{
private static Activity m_ActivityInstance;

public static void Init(Activity ActivityInstance)
{
    m_ActivityInstance = ActivityInstance;
}

public static native void BatteryStateChanged(int Level, boolean OnCharge);

public static void InstallBatteryListener()
{
    IntentFilter BatteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);

    BroadcastReceiver BatteryLevelReceiver = new BroadcastReceiver()
    {
        public void onReceive(Context context, Intent intent)
        {
            boolean OnCharge = (intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1) == 0) ? false : true;
            int Level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
            int Scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);

            if(Level >= 0 && Scale > 0)
            {
                BatteryStateChanged((Level * 100) / Scale, OnCharge);
            }
        }
    };

    m_ActivityInstance.registerReceiver(BatteryLevelReceiver, BatteryLevelFilter);
}

}