Internet Connectivity Listener in Xamarin.Forms - c#-4.0

Question

I am new in Xamarin.Forms and I want to check internet connectivity status in iOS and Android app. In fact using CrossConnectivity Plugins I am able to check internet connectivity successfully but It is not working as Listener. For example, When I open my app and internet connection is not there then it shows me message that "No internet connection" and now if I ON my mobile data then also it shows me same message. I am using below code for this:
string isConnected=CrossConnectivity.Current.IsConnected?"Connected":"No Connection";
My app is not able to listen the changing status of internet connectivity in middle something.

Answer 1

Using the plugin CrossConnectivity, you need to listen to changes via the event ConnectivityChanged, so in your page, or your App class, add this code to write an event handler:
CrossConnectivity.Current.ConnectivityChanged += (sender, args) =>
{
//your implementation
this.DisplayAlert("Connectivity Changed", "IsConnected: " + args.IsConnected.ToString(), "OK");
};

Answer 2

I have the solution for Android but i haven't started working on ios part
(better than nothing ;)
First Create a broadcastReceiver
public class Localize: BroadcastReceiver
{
public static Context context;
public Localize(Context ctx)
{
context = ctx;
}
public override void OnReceive (Context context, Intent intent)
{
isNetworkAvailable (context);
}
public void isNetworkAvailable(Context context)
{
Boolean state = false;
ConnectivityManager connectivity = (ConnectivityManager)
context.GetSystemService(Context.ConnectivityService);
if (connectivity != null)
{
NetworkInfo[] info = connectivity.GetAllNetworkInfo();
foreach (NetworkInfo nwork in info)
{
if (nwork.GetState () == NetworkInfo.State.Connected) {
ConnectionDetected();//Execute your fonction here
break;
}
}
}
}
Then register your broadcastreceiver with intent in your activity (in MainActivity for example)
IntentFilter filter = new IntentFilter(ConnectivityManager.ConnectivityAction);
receiver = new Localize(this);
RegisterReceiver(receiver, filter);
This should work as long as your application is running.. If you want a service that runs even if your App is killed you should create a service and then register broadcastReceiver in your service..
CrossConnectivity.Current.IsReachable("localhost");
this also works if you download package. I haven't tested it thoroughly