Xamarin.android Notification onClick doesn't take to new activity - xamarin

Question

This is going to be a long post! (grab a cup of coffee/popcorn)
I am using AltBeacon Xamarin sample in my code to show the beacons.
I have come across this example in creating Notifications in Xamarin.
Here there's an Application class where the core logic goes.
public class AltBeaconSampleApplication : Application, IBootstrapNotifier
{
private const string TAG = "AltBeaconSampleApplication";
BeaconManager _beaconManager;
private RegionBootstrap regionBootstrap;
private Region _backgroundRegion;
private BackgroundPowerSaver backgroundPowerSaver;
private bool haveDetectedBeaconsSinceBoot = false;
private string nearbyMessageString = "A beacon is nearby.";
private string nearbyTitleString = "AltBeacon Reference Application";
private MainActivity mainActivity = null;
public MainActivity MainActivity
{
get { return mainActivity; }
set { mainActivity = value; }
}
private NotificationActivity notificationActivity = null;
public NotificationActivity NotificationActivity
{
get { return notificationActivity; }
set { notificationActivity = value; }
}
public AltBeaconSampleApplication() : base() { }
public AltBeaconSampleApplication(IntPtr javaReference, Android.Runtime.JniHandleOwnership transfer) : base(javaReference, transfer) { }
public override void OnCreate()
{
base.OnCreate();
_beaconManager = BeaconManager.GetInstanceForApplication(this);
var iBeaconParser = new BeaconParser();
// Estimote > 2013
iBeaconParser.SetBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24");
_beaconManager.BeaconParsers.Add(iBeaconParser);
Log.Debug(TAG, "setting up background monitoring for beacons and power saving");
// wake up the app when a beacon is seen
_backgroundRegion = new Region("backgroundRegion", null, null, null);
regionBootstrap = new RegionBootstrap(this, _backgroundRegion);
// simply constructing this class and holding a reference to it in your custom Application
// class will automatically cause the BeaconLibrary to save battery whenever the application
// is not visible. This reduces bluetooth power usage by about 60%
backgroundPowerSaver = new BackgroundPowerSaver(this);
PerformHttpRequest();
}
public void DidDetermineStateForRegion(int state, AltBeaconOrg.BoundBeacon.Region region)
{
}
public async void PerformHttpRequest()
{
try
{
using (var client = new HttpClient())
{
var uri = "http://exampleuri";
var result = await client.GetStringAsync(uri);
var response = JsonConvert.DeserializeObject<BeaconURL>(result);
SendNotificationFromBeacon(response);
}
}
catch(Exception ex)
{
throw ex;
}
}
private void SendNotificationFromBeacon(BeaconURL receivedNotification)
{
// Setup an intent for SecondActivity:
Intent notificationIntent = new Intent(this, typeof(NotificationActivity));
// Pass some information to SecondActivity:
notificationIntent.PutExtra("CompaignUrl", receivedNotification.CompaignUrl);
notificationIntent.PutExtra("MediaUrl", receivedNotification.MediaUrl);
notificationIntent.PutExtra("titleText", receivedNotification.Title);
notificationIntent.SetFlags(ActivityFlags.NewTask);
// Create a task stack builder to manage the back stack:
Android.App.TaskStackBuilder stackBuilder = Android.App.TaskStackBuilder.Create(this);
// Add all parents of SecondActivity to the stack:
stackBuilder.AddParentStack(Java.Lang.Class.FromType(typeof(NotificationActivity)));
// Push the intent that starts SecondActivity onto the stack:
stackBuilder.AddNextIntent(notificationIntent);
// Obtain the PendingIntent for launching the task constructed by
// stackbuilder. The pending intent can be used only once (one shot):
const int pendingIntentId = 0;
PendingIntent pendingIntent =
stackBuilder.GetPendingIntent(pendingIntentId, PendingIntentFlags.OneShot);
// Instantiate the builder and set notification elements, including
// the pending intent:
var builder =
new NotificationCompat.Builder(this)
.SetContentTitle(receivedNotification.Title)
.SetContentText(receivedNotification.Text)
.SetSmallIcon(Android.Resource.Drawable.IcDialogInfo);
// Build the notification:
Notification notification = builder.Build();
// Get the notification manager:
NotificationManager notificationManager =
GetSystemService(Context.NotificationService) as NotificationManager;
// Publish the notification:
const int notificationId = 0;
notificationManager.Notify(notificationId, notification);
}
}
BeaconURL is a POCO class
NotificationActivity is a basic Activity class.
I perform the HttpClient request and get data. I create a notification and present it on my screen. It goes like this
Now when I tap on the notification, I dont go to the NotificationActivity. I am trying to invoke an activity from an ApplicationClass. Is this the right way to perform such stuff. Kindly provide details.
Thanks.
Edit: Added NotificationActivity Class
[Activity(Label = "NotificationActivity")]
public class NotificationActivity : MainActivity
{
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Create your application here
SetContentView(Resource.Layout.NotificationLayout);
TextView titleTextView = FindViewById<TextView>(Resource.Id.txtTitle);
titleTextView.Text = Intent.Extras.GetString("titleText", "");
ImageView mediaImage = FindViewById<ImageView>(Resource.Id.imgViewMedia);
mediaImage.SetImageBitmap(GetImageBitmapFromUrl(Intent.Extras.GetString("MediaUrl", "")));
}
private Bitmap GetImageBitmapFromUrl(string url)
{
Bitmap imageBitmap = null;
using (var webClient = new WebClient())
{
var imageBytes = webClient.DownloadData(url);
if (imageBytes != null && imageBytes.Length > 0)
{
imageBitmap = BitmapFactory.DecodeByteArray(imageBytes, 0, imageBytes.Length);
}
}
return imageBitmap;
}
}

Answer 1

First thing you need to do is to set the your pending intent within the notification builder, it will get your NotificationActivity launching:
var builder =
new NotificationCompat.Builder(this)
.SetContentTitle("receivedNotification.Title")
.SetContentText("receivedNotification.Text")
.SetSmallIcon(Android.Resource.Drawable.IcDialogInfo)
.SetContentIntent(pendingIntent);
The second will be to get your back stack setup, from what you posted I'm not sure what the flow should be as the user will exit the app if they use the back button.
If you want the user to go back to the MainActivity when that press the back button, then you can add a ParentActivity to your NotificationActivity activity attribute, i.e.:
[Activity(Label = "NotificationActivity", ParentActivity = typeof(MainActivity))]
And thus the line:
stackBuilder.AddParentStack(Java.Lang.Class.FromType(typeof(NotificationActivity)));
Would add the MainActivity to the back stack.