Question

我正在尝试在Azure通知中心注册我的FCM服务。

我正在使用扩展FirebaseMessagingService（）的实例ID服务获得有效的FCM令牌。

下面是我的InstanceIdService，它将返回有效令牌并启动我的registrationIntentService

    class FCMInstanceIdService : FirebaseMessagingService() {

    companion object {
        private const val TAG = "FCMInstanceIDService"
    }

    init {
        Log.i(TAG, "init")
    }

    override fun onNewToken(refreshedToken: String?) {

        FirebaseInstanceId.getInstance().instanceId.addOnSuccessListener { instanceIdResult ->

            instanceIdResult.token

            // Log the event
            Log.i(TAG, "Refreshing GCM Registration Token")

            // Declare our intent to start the service
            val intent = Intent(this, FCMRegistrationIntentService::class.java)
            // Start the service!
            startService(intent)
        }
    }
}

下面是我尝试在通知中心注册此令牌的部分代码。

// Declare the azure notification hub
val notificationHub = NotificationHub(
        // Provide our notification hub name
        CentreMK.FCM_NOTIFICATION_HUB_NAME,
        // Provide our notification hub connection string
        CentreMK.FCM_NOTIFICATION_HUB_LISTEN_CONNECTION_STRING,
        // The context of this service
        this)

// Log the event
Log.i(TAG, "Attempting to register with NH using token : $token")

// Update the registration id by registering our token with the notification hub
// This provides us with the registration id
regID = notificationHub.register(token).registrationId

这是我得到的例外：

Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference

感谢任何帮助，因为我不知道正确配置所有内容后如何获得空指针异常。

Answer 1

在初始化课堂上的String HubListenConnectionString时：

public class NotificationSettings {
   public static String SenderId = "<Your project number>";
   public static String HubName = "<Your HubName>";
   public static String HubListenConnectionString = "<Enter your DefaultListenSharedAccessSignature connection string>";
}

您没有在字符串的开头添加"Endpoint=sb://"（即public static String HubListenConnectionString ="Endpoint=sb://......"。之后，您可能会遇到“找不到资源”异常错误。这就是我现在遇到的问题。< / p>

具有FCM的Azure通知HUB-NullPointerException

1 个答案: