A simple network listener

NetworkReceiver.java

package com.azconception.taxi.broadcast;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.util.Log;

/**
 * Created by do_f on 28/07/16.
 */
public class MyNetworkReceiver extends BroadcastReceiver {

    private static final String     TAG = MyNetworkReceiver.class.getSimpleName();

    public static final int        NETWORK_OFF = 0;
    public static final int        NETWORK_ON = 1;

    private OnNetworkStateChanged   mListener;

    @Override
    public void onReceive(Context context, Intent intent) {
        if (mListener != null) {
            ConnectivityManager cm =
                (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            if (cm.getActiveNetworkInfo() != null) {
                mListener.onStateChange(NETWORK_ON);
            } else {
                mListener.onStateChange(NETWORK_OFF);
            }
        }
    }

    public interface OnNetworkStateChanged {
        void onStateChange(int state);
    }

    public OnNetworkStateChanged getmListener() {
        return mListener;
    }

    public void setmListener(OnNetworkStateChanged mListener) {
        this.mListener = mListener;
    }
}

NetworkReceiverActivity.java

public class MainActivity extends AppCompactActivity {
 
    protected void initNetwork() {
        IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
        network = new MyNetworkReceiver();
        registerReceiver(network, filter);
        network.setmListener(this);
        isNetworkRegistered = true;
    }
  
    @Override
    protected void onResume() {
        super.onResume();
        if (!isNetworkRegistered && network == null)
            initNetwork();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // Unregisters BroadcastReceiver when app is destroyed.
        if (network != null && isNetworkRegistered) {
            isNetworkRegistered = false;
            this.unregisterReceiver(network);
        }
    }
}