如何在Android（Xamarin）上爲AWS SNS啓用推送通知

Question

我一直在嘗試幾個小時來爲Android啓用推送通知，因此我可以在Amazon SNS中使用它。試圖遵循文檔中描述的代碼：http://docs.aws.amazon.com/mobile/sdkforxamarin/developerguide/getting-started-sns-android.html

好像我做錯了什麼，因爲我創建的「意圖」有「行動」設置爲null，這會導致OnHandleIntent中的異常。有沒有人有這方面的經驗？我對Android很新，所以我對「意圖」的理解很有限。

這裏是在MainActivity

[Activity (Label = "awst", MainLauncher = true, Icon = "@mipmap/icon")] 
public class MainActivity : Activity 
{ 
int count = 1; 

    protected override void OnCreate (Bundle savedInstanceState) 
    { 
     base.OnCreate (savedInstanceState); 

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

     // Get our button from the layout resource, 
     // and attach an event to it 
     Button button = FindViewById<Button> (Resource.Id.myButton); 

     button.Click += delegate { 

      button.Text = string.Format ("{0} clicks!", count++); 

      var intent = new Intent (this, typeof (GCMIntentService));  


     }; 

    } 
} 

[BroadcastReceiver(Permission = "com.google.android.c2dm.permission.SEND")] 
[IntentFilter(new string[] { 
    "com.google.android.c2dm.intent.RECEIVE" 
}, Categories = new string[] { 
    "com.companyname.awst" /* change to match your package */ 
})] 
[IntentFilter(new string[] { 
    "com.google.android.c2dm.intent.REGISTRATION" 
}, Categories = new string[] { 
    "com.companyname.awst" /* change to match your package */ 
})] 
[IntentFilter(new string[] { 
    "com.google.android.gcm.intent.RETRY" 
}, Categories = new string[] { 
    "com.companyname.awst" /* change to match your package */ 
})] 

public class GCMBroadcastReceiver: BroadcastReceiver { 
    const string TAG = "PushHandlerBroadcastReceiver"; 
    public override void OnReceive(Context context, Intent intent) { 

     GCMIntentService.RunIntentInService(context, intent); 
     SetResult(Result.Ok, null, null); 
    } 
} 

[BroadcastReceiver] 
[IntentFilter(new[] { 
    Android.Content.Intent.ActionBootCompleted 
})] 

public class GCMBootReceiver: BroadcastReceiver { 
    public override void OnReceive(Context context, Intent intent) { 
     GCMIntentService.RunIntentInService(context, intent); 
     SetResult(Result.Ok, null, null); 
    } 
} 
} 

和意圖服務

namespace awst.Droid 
{ 
[Service] 
public class GCMIntentService: IntentService { 

    static PowerManager.WakeLock sWakeLock; 
    static object LOCK = new object(); 

    public static void RunIntentInService(Context context, Intent intent) { 
     lock(LOCK) { 
      if (sWakeLock == null) { 
       // This is called from BroadcastReceiver, there is no init. 
       var pm = PowerManager.FromContext(context); 
       sWakeLock = pm.NewWakeLock(
        WakeLockFlags.Partial, "My WakeLock Tag"); 
      } 
     } 

     sWakeLock.Acquire(); 
     intent.SetClass(context, typeof(GCMIntentService)); 

     // 
     context.StartService(intent); 
    } 

    protected override void OnHandleIntent(Intent intent) { 
     try { 
      Context context = this.ApplicationContext; 
      string action = intent.Action; 

      // !!!!!! 
      // this is where the code fails with action beeing null 
      // !!!!!! 

      if (action.Equals("com.google.android.c2dm.intent.REGISTRATION")) { 
       HandleRegistration(intent); 
      } else if (action.Equals("com.google.android.c2dm.intent.RECEIVE")) { 
       HandleMessage(intent); 
      } 
     } finally { 
      lock(LOCK) { 
       //Sanity check for null as this is a public method 
       if (sWakeLock != null) sWakeLock.Release(); 
      } 
     } 
    } 

    private void HandleRegistration(Intent intent) { 

     Globals config = Globals.Instance; 

     string registrationId = intent.GetStringExtra("registration_id"); 
     string error = intent.GetStringExtra("error"); 
     string unregistration = intent.GetStringExtra("unregistered"); 

     if (string.IsNullOrEmpty(error)) { 

      config.snsClient.CreatePlatformEndpointAsync(new CreatePlatformEndpointRequest { 
       Token = registrationId, 
       PlatformApplicationArn = config.AWS_PlaformARN /* insert your platform application ARN here */ 
      }); 
     } 
    } 

    private void HandleMessage(Intent intent) { 
     string message = string.Empty; 
     Bundle extras = intent.Extras; 
     if (!string.IsNullOrEmpty(extras.GetString("message"))) { 
      message = extras.GetString("message"); 
     } else { 
      message = extras.GetString("default"); 
     } 

     Log.Info("Messages", "message received = " + message); 

     ShowNotification("SNS Push", message); 
     //show the message 

    } 

    public void ShowNotification(string contentTitle, 
     string contentText) { 
     // Intent 
     Notification.Builder builder = new Notification.Builder(this) 
      .SetContentTitle(contentTitle) 
      .SetContentText(contentText) 
      .SetDefaults(NotificationDefaults.Sound | NotificationDefaults.Vibrate) 
      //todo 
      .SetSmallIcon(Resource.Mipmap.Icon) 
      .SetSound(RingtoneManager.GetDefaultUri(RingtoneType.Notification)); 

     // Get the notification manager: 
     NotificationManager notificationManager = this.GetSystemService(Context.NotificationService) as NotificationManager; 

     notificationManager.Notify(1001, builder.Build()); 
    } 
} 
} 

所以問題：

如何註冊的設備，所以我可以再從SNS發送推？有什麼不同的方式我應該考慮？ 有沒有其他的步驟我必須採取這個工作？我沒有將證書上傳到AWS，但我是否需要在應用代碼中配置任何權限？

非常感謝！

克里斯

Answer 1

你可能想看看SNS樣品中GitHub或通過Xamarin component store充實到起步，你可能會發現一些東西，你缺失和不完全覆蓋的入門指南中。東西叫一聲，我認爲是存在的例子，但不是在你的代碼是在主要活動RegisterForGCM()：

private void RegisterForGCM() 
{ 
    string senders = Constants.GoogleConsoleProjectId; 
    Intent intent = new Intent("com.google.android.c2dm.intent.REGISTER"); 
    intent.SetPackage("com.google.android.gsf"); 
    intent.PutExtra("app", PendingIntent.GetBroadcast(this, 0, new Intent(), 0)); 
    intent.PutExtra("sender", senders); 
    StartService(intent); 
}