Xamarin Mobile Development for Android Cookbook by 2015

Author:2015
Language: eng
Format: mobi
Publisher: Packt Publishing

The receiver will redirect any messages to a service for processing. The service inherits from GcmListenerService and has a specific intent filter. We can then process the message in the OnMessageReceived() method:[Service] [IntentFilter(new []{ "com.google.android.c2dm.intent.RECEIVE })] public class NotificationService : GcmListenerService { public override void OnMessageReceived( string from, Bundle data) { // process the data bundle var message = data.GetString("cookbook_message"); } }

Sometimes the token becomes invalid, for example if the server or Google decide to refresh the tokens. When this happens, our app will be notified:

To handle token refresh events, we create an interface that inherits from the InstanceIDListenerService type:[Service] [IntentFilter( new []{ "com.google.android.gms.iid.InstanceID" })] public class InstanceIdService : InstanceIDListenerService { public override void OnTokenRefresh() { var instanceId = InstanceID.GetInstance(this); var token = instanceId.GetToken( "PROJECT_NUMBER", GoogleCloudMessaging.InstanceIdScope); } }

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