Question

I’ve been attempting to get a toy intent service running for monodroid essentially going off of this source material and I’ve been having some issues and I’ve gotten it down to the broadcast receiver. More than anything I’m suspicious of the ACTION_RESP string. If nothing else I could certainly stand maybe confirmation of that and maybe the correct way to set an action that the receiver can see.
So, this is what I have thus far…

My Intent Service

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.Util;

namespace Mono_For_Android_Intent_Service
{
    [Service]
    public class TestIntentService : IntentService
    {
        public static String PARAM_IN_MSG = "imsg";
        public static String PARAM_OUT_MSG = "omsg";

        #region Constructor
        public TestIntentService()
            : base("TestIntentService")
        {
        }
        #endregion

        protected override void OnHandleIntent(Intent intent)
        {
            string msg = intent.GetStringExtra(PARAM_IN_MSG);
            //Do Stuff
            string result = msg + " " + DateTime.Now.ToString();
            Intent BroadcastIntent = new Intent(this,typeof(Mono_For_Android_Intent_Service.MainActivity.MyBroadcastReceiver));
            BroadcastIntent.SetAction(Mono_For_Android_Intent_Service.MainActivity.MyBroadcastReceiver.ACTION_RESP);
            BroadcastIntent.AddCategory(Intent.CategoryDefault);
            BroadcastIntent.PutExtra(PARAM_OUT_MSG,result);
            SendBroadcast(BroadcastIntent);
        }
    }
}

Main Activity and Broadcast Receiver

using System;

using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;

namespace Mono_For_Android_Intent_Service
{
    [Activity(Label = "Mono_For_Android_Intent_Service", MainLauncher = true, Icon = "@drawable/icon")]
    public partial class MainActivity : Activity
    {
        private MyBroadcastReceiver Receiver;
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.Main);

            IntentFilter filter = new IntentFilter(MyBroadcastReceiver.ACTION_RESP);
            filter.AddCategory(Intent.CategoryDefault);
            Receiver = new MyBroadcastReceiver();
            RegisterReceiver(Receiver, filter);

            var button = FindViewById<Button>(Resource.Id.start);
            button.Click += (s,e)=>
            {
                Intent msgIntent= new Intent(this,typeof(TestIntentService));
                msgIntent.PutExtra(TestIntentService.PARAM_IN_MSG,"Me message, arh");
                Toast.MakeText(this, "Starting intent service!", ToastLength.Short).Show();
                StartService(msgIntent);

            };

            TextView txtView = FindViewById<TextView>(Resource.Id.status);
        }

        public class MyBroadcastReceiver : BroadcastReceiver
        {
            public static readonly string ACTION_RESP = "Mono_For_Android_Intent_Service.Intent.Action.MESSAGE_PROCESSED";
            public override void OnReceive(Context context, Intent intent)
            {
                Toast.MakeText(context, "Firing On Receive!", ToastLength.Short).Show();
                var activity = (MainActivity)context;
                TextView txtView = activity.FindViewById<TextView>(Resource.Id.status);
                txtView.Text = intent.GetStringExtra(TestIntentService.PARAM_OUT_MSG).ToString();
                Toast.MakeText(context, "On Receive complete!", ToastLength.Short).Show();
            }
        }
    }
}

1. Am I doing it wrong? Am I close? I’d like to think I’m pretty close but, by all means if I’m in timbucktoo I would like to know…
2. If so what correct way to go about sending and receiving that broadcast?

Answer 1

If you want your broadcast receiver to be registered with the system, you need to add the [BroadcastReceiver] attribute.

Sample:

https://github.com/xamarin/monodroid-samples/blob/master/ApiDemo/App/OneShotAlarm.cs