使用 Azure 通知中心的 Xamarin Android 未收到通知

Question

我们使用 Xamarin 开发了一个 Android 应用程序，但我们在 Azure 通知中心遇到了问题。我们试图向在我们的 Azure 移动服务中注册的 Android 设备发送推送通知，但没有注册的 Android 设备接收到通知。当我们尝试通过 Azure 门户中的通知中心对其进行调试时，结果显示通知已发送到设备。但是，设备没有收到之前收到的通知。
请让我们知道我们的代码中缺少某些内容（查找下面的代码）或 Azure 通知中心（适用于 Android GCM）中是否有任何问题。

注意：推送通知的所有 android 权限都在下面的同一代码文件中给出，而不是在 Android 清单中。

我们的 GCM 服务代码如下：

using System.Text;
using Android.App;
using Android.Content;
using Android.Util;
using Gcm.Client;


//VERY VERY VERY IMPORTANT NOTE!!!!
// Your package name MUST NOT start with an uppercase letter.
// Android does not allow permissions to start with an upper case letter
// If it does you will get a very cryptic error in logcat and it will not be obvious why you are crying!
// So please, for the love of all that is kind on this earth, use a LOWERCASE first letter in your Package Name!!!!
using ByteSmith.WindowsAzure.Messaging;
using System.Diagnostics;
using System.Collections.Generic;
using System;

[assembly: Permission(Name = "@PACKAGE_NAME@.permission.C2D_MESSAGE")]
[assembly: UsesPermission(Name = "@PACKAGE_NAME@.permission.C2D_MESSAGE")]
[assembly: UsesPermission(Name = "com.google.android.c2dm.permission.RECEIVE")]

//GET_ACCOUNTS is only needed for android versions 4.0.3 and below
[assembly: UsesPermission(Name = "android.permission.GET_ACCOUNTS")]
[assembly: UsesPermission(Name = "android.permission.INTERNET")]
[assembly: UsesPermission(Name = "android.permission.WAKE_LOCK")]

namespace seeMuscatAndroidApp
{
    //You must subclass this!
    [BroadcastReceiver(Permission= Gcm.Client.Constants.PERMISSION_GCM_INTENTS)]
    [IntentFilter(new string[] { Gcm.Client.Constants.INTENT_FROM_GCM_MESSAGE }, Categories = new string[] { "@PACKAGE_NAME@" })]
    [IntentFilter(new string[] { Gcm.Client.Constants.INTENT_FROM_GCM_REGISTRATION_CALLBACK }, Categories = new string[] { "@PACKAGE_NAME@" })]
    [IntentFilter(new string[] { Gcm.Client.Constants.INTENT_FROM_GCM_LIBRARY_RETRY }, Categories = new string[] { "@PACKAGE_NAME@" })]
    public class PushHandlerBroadcastReceiver : GcmBroadcastReceiverBase<GcmService>
    {

        public static string[] SENDER_IDS = new string[] { Constants.SenderID };

        public const string TAG = "GoogleCloudMessaging";
    }

    [Service] //Must use the service tag
    public class GcmService : GcmServiceBase
    {
        public static string RegistrationID { get; private set; }
        private NotificationHub Hub { get; set; }

        Context _generalContext;

        public GcmService() : base(PushHandlerBroadcastReceiver.SENDER_IDS) 
        {
            Log.Info(PushHandlerBroadcastReceiver.TAG, "GcmService() constructor"); 
        }

        protected override async void OnRegistered (Context context, string registrationId)
        {
            Log.Verbose(PushHandlerBroadcastReceiver.TAG, "GCM Registered: " + registrationId);
            RegistrationID = registrationId;

            _generalContext = context;

            //createNotification("GcmService Registered...", "The device has been Registered, Tap to View!");

            Hub = new NotificationHub(Constants.NotificationHubPath, Constants.ConnectionString);
            try
            {
                await Hub.UnregisterAllAsync(registrationId);
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex.Message);
                Debugger.Break();
            }


            var tags = new List<string>() { main.userCountry, main.userCity, main.userLatitude, main.userLongitude, main.userPhoneMake, main.userPhoneModel, main.userPhoneName, main.userPhoneAndroidVersion, main.userAppVersion,main.userUID};

            Console.WriteLine("///////////HUB TAGS///////////////////");
            Console.WriteLine("Country:" + main.userCountry);
            Console.WriteLine("City:" + main.userCity);
            Console.WriteLine("Latitude:" + main.userLatitude);
            Console.WriteLine("Longitude:"+main.userLongitude);
            Console.WriteLine("Make:" + main.userPhoneMake);
            Console.WriteLine("Model:" + main.userPhoneModel);
            Console.WriteLine("Phone Name:" + main.userPhoneName);
            Console.WriteLine("Android Version:" + main.userPhoneAndroidVersion);
            Console.WriteLine("App version:" + main.userAppVersion);
            Console.WriteLine("User ID:" + main.userUID);
            Console.WriteLine("///////////END OF HUB TAGS///////////////////");


            try
            {
                var hubRegistration = await Hub.RegisterNativeAsync(registrationId, tags);                
                Debug.WriteLine("RegistrationId:" + hubRegistration.RegistrationId);
            }
            catch (Exception ex)
            {
                Debug.WriteLine("#########$$$$Error:"+ex.Message); 

            }
        }



        protected override void OnUnRegistered (Context context, string registrationId)
        {
            Log.Verbose(PushHandlerBroadcastReceiver.TAG, "GCM Unregistered: " + registrationId);
            //Remove from the web service
            //  var wc = new WebClient();
            //  var result = wc.UploadString("http://your.server.com/api/unregister/", "POST",
            //      "{ 'registrationId' : '" + lastRegistrationId + "' }");

            //createNotification("GcmService Unregistered...", "The device has been unregistered, Tap to View!");
        }

        protected override void OnMessage (Context context, Intent intent)
        {
            Log.Info(PushHandlerBroadcastReceiver.TAG, "GCM Message Received!");

            Debug.WriteLine("/********* GCM Received ****************");

            var msg = new StringBuilder();

            if (intent != null && intent.Extras != null)
            {
                foreach (var key in intent.Extras.KeySet())
                    msg.AppendLine(key + "=" + intent.Extras.Get(key).ToString());
            }

            //Store the message
            var prefs = GetSharedPreferences(context.PackageName, FileCreationMode.Private);
            var edit = prefs.Edit();
            edit.PutString("last_msg", msg.ToString());
            edit.Commit();

            string message = intent.Extras.GetString("message");
            if (!string.IsNullOrEmpty(message))
            {
                createNotification("New todo item!", "Todo item: " + message);
                return;
            }

            string msg2 = intent.Extras.GetString("msg");
            string notititle = intent.Extras.GetString("notititle");
            if (!string.IsNullOrEmpty(msg2))
            {
                createNotification(notititle, msg2);
                return;
            }

            // createNotification("PushSharp-GCM Msg Rec'd", "Message Received for C2DM-Sharp... Tap to View!");
            //createNotification("Unknown message details", msg.ToString());
        }

        protected override bool OnRecoverableError (Context context, string errorId)
        {
            Log.Warn(PushHandlerBroadcastReceiver.TAG, "Recoverable Error: " + errorId);

            return base.OnRecoverableError (context, errorId);
        }

        protected override void OnError (Context context, string errorId)
        {
            Log.Error(PushHandlerBroadcastReceiver.TAG, "GCM Error: " + errorId);
        }

        void createNotification(string title, string desc)
        {
            //Create notification
            var notificationManager = GetSystemService(Context.NotificationService) as NotificationManager;

            //Create an intent to show ui
            Intent uiIntent = new Intent();
            uiIntent.SetClass(this, typeof(dealsview));
            uiIntent.PutExtra("contentID", "todaydeals");
            uiIntent.PutExtra("contentName", "");
            uiIntent.PutExtra("isSale", ""); 
            //Create the notification
            var notification = new Notification(Resource.Drawable.Icon, title);

            //Auto cancel will remove the notification once the user touches it
            notification.Flags = NotificationFlags.AutoCancel;
            notification.Defaults = NotificationDefaults.All;
            //Set the notification info
            //we use the pending intent, passing our ui intent over which will get called
            //when the notification is tapped.
            notification.SetLatestEventInfo(this, title, desc, PendingIntent.GetActivity(this, 0, uiIntent, 0));

            //Show the notification
            notificationManager.Notify(1, notification);


        }



    }
}

Answer 1

权限是包含 XML 数据的清单文件中的标记。在编译 DVM 时，会检查 Manifest 文件中的权限和其他必要数据以打包到 .apk 中。您应该始终遵循相同的格式。

请查看tutorial 了解更多信息。