Xamarin 的AWS行動 SDK 現在已包含在AWS SDK for .NET. 本指南參考 Xamarin 行動 SDK 的封存版本。

本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

使用 SNS 接收推送通知

本教程介紹瞭如何使用 Amazon Simple Notification Service (SNS) 和適用於 .NET 和 Xamarin 的 AWS 移動軟件開發工具包向 Xamarin Android 應用程序發送推送通知。

專案設定

先決條件

您必須完成設定適用於 .NET 和 Xamarin 的 AWS Mobile SDK，然後再開始本教程。

設定 SNS 的許可

按照步驟 2設定適用於 .NET 和 Xamarin 的 AWS Mobile SDK將下面提到的策略附加到應用程序的角色。這將為您的應用程序授予訪問 SNS 的適當權限：

在谷歌雲端啟用推送通知

首先，添加一個新的谷歌 API 項目：

接下來，啟用適用於您的專案的 Google Cloud Message (GCM) 服務：

最後，獲取 API 密鑰：

使用項目 ID 在 SNS 控制台中創建平台 ARN

AddNuGetSNS 軟件包到您的項目

請按照中的説明步驟 4設定適用於 .NET 和 Xamarin 的 AWS Mobile SDK添加 Amazon Simple Notification ServiceNuGet包添加至您的專案。

建立 SNS 客户端

var snsClient = new AmazonSimpleNotificationServiceClient(credentials, region);

註冊應用程序以獲得遠程通知

若要在 Android 上註冊遠程通知，您需要建立BroadcastReceiver，它可以接收谷歌雲消息。在提示時更改下面的軟件包名稱：

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

以下是接收來自BroadcastReceiver並在設備的通知欄上顯示通知：

[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;

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

    if (string.IsNullOrEmpty(error)) {
      var response = await SnsClient.CreatePlatformEndpointAsync(new CreatePlatformEndpointRequest {
        Token = registrationId,
        PlatformApplicationArn = "YourPlatformArn" /* 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(this, "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)
      .SetSmallIcon(Resource.Drawable.Icon)
      .SetSound(RingtoneManager.GetDefaultUri(RingtoneType.Notification));

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

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

從 SNS 控制台向終端節點發送消息