NetworkUtilImpl.java

package com.path.android.jobqueue.network;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

/**
 * default implementation for network Utility to observe network events
 */
public class NetworkUtilImpl implements NetworkUtil, NetworkEventProvider {
    private Listener listener;
    public NetworkUtilImpl(Context context) {
        context.getApplicationContext().registerReceiver(new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                if(listener == null) {//shall not be but just be safe
                    return;
                }
                //http://developer.android.com/reference/android/net/ConnectivityManager.html#EXTRA_NETWORK_INFO
                //Since NetworkInfo can vary based on UID, applications should always obtain network information
                // through getActiveNetworkInfo() or getAllNetworkInfo().
                listener.onNetworkChange(isConnected(context));
            }
        }, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
    }

    @Override
    public boolean isConnected(Context context) {
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo netInfo = cm.getActiveNetworkInfo();
        return netInfo != null && netInfo.isConnectedOrConnecting();
    }

    @Override
    public void setListener(Listener listener) {
        this.listener = listener;
    }
}