FCM - 重新调试应用程序后发送消息时出现 Android Xamarin NotRegistered 错误

我正在 Xamarin Android 中开发一个应用程序，对于通知，我使用 FCM 预发布包：https://www.nuget.org/packages/Xamarin.Firebase.Messaging/

现在，如果我清理应用程序数据，一切都会正常工作，OnTokenRefresh事件被触发并生成一个新令牌 - 当我在此令牌上发送新通知时，设备将发送和接收通知OnMessageReceived() -

问题是当我更改代码并再次运行应用程序时，如果我使用旧令牌，我会得到NotRegistered发送通知时出错，但如果我去清理应用程序数据，则会触发 OnTokenRefresh() 并生成新令牌 - 新令牌有效。

这里有类似的问题，但这是 GCM（我正在使用 FCM）：

Google 云消息“未注册”失败和取消订阅最佳实践？

https://stackoverflow.com/a/36856867/1910735

https://forums.xamarin.com/discussion/65205/google-cloud-messaging-issues#latest

My FCMInstanceIdService

[Service, IntentFilter(new[] { "com.google.firebase.INSTANCE_ID_EVENT" })]
public class FCMInstanceIdService : FirebaseInstanceIdService
{
    private string Tag = "FCMInstanceIdService";

    public override void OnTokenRefresh()
    {
        var fcmDeviceId = FirebaseInstanceId.Instance.Token;

        if (Settings.DeviceId != fcmDeviceId)
        {
            var oldDeviceId = Settings.DeviceId;

            Settings.DeviceId = fcmDeviceId;

            //TODO: update token on DB - Currently OnTokenRefresh is only called when: 1. App data is cleaned, 2. The app is re-installed
            //_usersProvider.UpdateUserDeviceId(oldDeviceId, fcmDeviceId);
        }

        base.OnTokenRefresh();
    }
}

我的消息接收服务：

[Service, IntentFilter(new[] { "com.google.firebase.MESSAGING_EVENT" })]
public class FCMListenerService : FirebaseMessagingService
{
    private string Tag = "FCM_Listener_Service";

    public override void OnMessageReceived(RemoteMessage message)
    {
        base.OnMessageReceived(message);

        var notification = message.GetNotification();
        var data = message.Data;
        var title = notification.Title;
        var body = notification.Body;

        SendNotification(title, body);
    }

    private void SendNotification(string title, string body)
    {
        //TODO: Display notification to user
    }
}

显现：

<application android:label="TBApp" android:theme="@style/TBAppTheme">

<receiver android:name="com.google.firebase.iid.FirebaseInstanceIdInternalReceiver" android:exported="false" />
<receiver android:name="com.google.firebase.iid.FirebaseInstanceIdReceiver" android:exported="true" android:permission="com.google.android.c2dm.permission.SEND" >
  <intent-filter>
    <action android:name="com.google.android.c2dm.intent.RECEIVE" />
    <action android:name="com.google.android.c2dm.intent.REGISTRATION" />
    <category android:name="${applicationId}" />
  </intent-filter>
</receiver>
</application>

如何在调试模式下强制刷新 FCM 令牌，以便不必在每次运行应用程序时删除应用程序数据？

由于此问题仅在调试应用程序时从 Visual Studio 运行应用程序时发生（不在部署到 PlayStore 的版本中），因此我暂时解决该问题的方法是创建以下服务：

    [Service]
    public class FCMRegistrationService : IntentService
    {
        private const string Tag = "FCMRegistrationService";
        static object locker = new object();

        protected override void OnHandleIntent(Intent intent)
        {
            try
            {
                lock (locker)
                {
                    var instanceId = FirebaseInstanceId.Instance;
                    var token = instanceId.Token;

                    if (string.IsNullOrEmpty(token))
                        return;

#if DEBUG
                    instanceId.DeleteToken(token, "");
                    instanceId.DeleteInstanceId();

#endif


                }
            }
            catch (Exception e)
            {
                Log.Debug(Tag, e.Message);
            }
        }
    }

然后在我的启动活动（每当打开应用程序时加载的活动）执行以下操作：

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


#if DEBUG
            if (!IsMyServiceRunning("FCMRegistrationService"))
            {
                var intent = new Intent(this, typeof(FCMRegistrationService));
                StartService(intent);
            }

            // For debug mode only - will accept the HTTPS certificate of Test/Dev server, as the HTTPS certificate is invalid /not trusted
            ServicePointManager.ServerCertificateValidationCallback += (o, certificate, chain, errors) => true;
#endif

}

这将注销您现有的 FCMToken 并刷新令牌，因此OnTokenRefresh方法将被调用，然后您将必须编写一些逻辑来更新服务器上的 FCMToken。

[Service, IntentFilter(new[] { "com.google.firebase.INSTANCE_ID_EVENT" })]
public class FCMInstanceIdService : FirebaseInstanceIdService
{
   // private string LogTag = "FCMInstanceIdService";

    public override void OnTokenRefresh()
    {
        var fcmDeviceId = FirebaseInstanceId.Instance.Token;

        // Settings (is Shared Preferences) - I save the FCMToken Id in shared preferences 
       // if FCMTokenId is not the same as old Token then update on the server

        if (Settings.FcmTokenId != fcmDeviceId)
        {
            var oldFcmId = Settings.FcmTokenId;

            var validationContainer = new ValidationContainer();

            // HERE UPDATE THE TOKEN ON THE SERVER
            TBApp.Current._usersProvider.UpdateFcmTokenOnServer(oldFcmId, fcmDeviceId, validationContainer);

            Settings.FcmTokenId = fcmDeviceId;

        }

        base.OnTokenRefresh();
    }
}