To connect Android BroadcastReceiver onReceive() method with cpp

ashajg

Hi guys
I want to connect public void onReceive(Context context, Intent intent) to my cpp file.
I tried to connect it in this way..

QAndroidJniObject intent("android/content/Intent");
QAndroidJniObject::callStaticObjectMethod("org/qtproject/example/WifiReceiver","onReceive","(Landroid/content/Context;Landroid/content/Intent;)V;",QtAndroid::androidContext().object(),intent.object());

but I am getting error

W System.err: java.lang.NoSuchMethodError: no static method "Lorg/qtproject/example/WifiReceiver;.onReceive(Landroid/content/Context;Landroid/content/Intent;)V;"

My manifest

<receiver android:name="org.qtproject.example.WifiReceiver" >
   <intent-filter android:priority="100">
      <action android:name="android.net.wifi.STATE_CHANGE" />
   </intent-filter>
</receiver>

How can I solve this error?

dheerendra

The error indicates that onReceive() is not static method in the class. Did you check it ?

ashajg

ok sir I ll correct it.

ashajg

Hi sir @dheerendra

Actually I was doing it in wrong way..

Challenge in front of me is that I at least want to print a string when my wifi network is changed to another wifi network or else if I closed wifi.

My java file:

public class WifiReceiver extends BroadcastReceiver
{

String ssid;


@Override
  public void onReceive(Context context, Intent intent) {

       NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
     if(info != null && info.isConnected()) {

       System.out.println("ashoish");
      
       WifiManager wifiManager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);
       WifiInfo wifiInfo = wifiManager.getConnectionInfo();
       //ssid = wifiInfo.getSSID();
       
       ssid="ashish";//SOME STRING
       getinfo(ssid);

     }
}

public native  static String getinfo(String ssid);


}

My Manifest:

<receiver android:name="org.qtproject.example.WifiReceiver" >
   <intent-filter android:priority="100">
      <action android:name="android.net.wifi.STATE_CHANGE" />
      <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
   </intent-filter>
</receiver>

<uses-permission android:name="android.permission.ACCESS_CHECKIN_PROPERTIES"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.net.wifi.WIFI_STATE_CHANGED"/>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
    <uses-permission android:name="android.net.conn.CONNECTIVITY_CHANGE"/>

In header:

JNIEXPORT void JNICALL Java_org_qtproject_example_WifiReceiver_getinfo(JNIEnv * /*env*/,
                                          jobject /*this_obj*/, jstring ssid)
{

    qDebug()<<"ssid is"<<ssid;

}

My minimum need is to get this statement executed System.out.println("ashoish"); when wifi network is shifted or if wifi Is closed. But it is not getting executed . I think I have not registered BroadcastReciever properly in my manifest file....

How can I solve this problem?

ashajg

Hi Sir @dheerendra

I got the solution.
I registered broadcast receiver programmatically and its working..

dheerendra

This is cool. If you put the code snippet of what you did will help others well.

ashajg

@dheerendra

Created MyActivity.java and called registerBroadcastReciever() in my main.cpp.

import android.net.NetworkInfo.DetailedState;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.app.Activity;
import android.content.Context;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.content.BroadcastReceiver;
import android.util.Log;
import org.qtproject.qt5.android.bindings.QtActivity;
import android.net.ConnectivityManager;
import android.content.IntentFilter;

public class MyActivity extends QtActivity
{

    public  void registerBroadcastReceiver() {
        WifiReceiver wifires =new WifiReceiver();
        System.out.println("ASHISH123");
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
        intentFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
        intentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
        registerReceiver(wifires, intentFilter);

        }

}

Main.cpp:

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include "wificlass.h"
#include<QQmlContext>
#include <QtAndroid>
int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

    QGuiApplication app(argc, argv);

    WIFICLASS w;

    QQmlApplicationEngine engine;

    QtAndroid::androidActivity().callMethod<void>("registerBroadcastReceiver");


    engine.rootContext()->setContextProperty("Ash",&w);
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    if (engine.rootObjects().isEmpty())
        return -1;

    return app.exec();
}

It solved my problem of registering BroadcastReceiver..