通过.NET向GCM Android应用程序发送数据

Question

我通过POST将数据从.NET应用程序发送到GCM。首先，我的android设备获得了一个Id，并将其POST到我的ASP.NET应用程序中。然后我在我的网站上有一个简单的按钮"发送消息"，它以JSON格式将数据发布到GCM。

Private Function SendNotification(ByVal JSonData As String) As String
    ServicePointManager.ServerCertificateValidationCallback = Function(sender As       Object,         certificate As X509Certificate, chain As X509Chain, sslPolicyErrors As SslPolicyErrors) True
    '/// Creating POST.
    Dim request As WebRequest = WebRequest.Create("https://android.googleapis.com/gcm/send")
    request.Method = "POST"
    request.ContentType = "Content-Type: application/json"
    request.Headers.Add(String.Format("Authorization: key={0}", MyAPIKey))
    '/// Converting data to byte array.
    Dim postData As String = JSonData
    Dim byteArray As Byte() = Encoding.UTF8.GetBytes(postData)
    '/// Post
    request.ContentLength = byteArray.Length
    Dim dataStream As Stream = request.GetRequestStream()
    dataStream.Write(byteArray, 0, byteArray.Length)
    dataStream.Close()
    '/// Response
    Dim response As WebResponse = request.GetResponse()
    dataStream = response.GetResponseStream()
    Dim reader As New StreamReader(dataStream)
    Dim responseFromServer As String = reader.ReadToEnd()
    reader.Close()
    dataStream.Close()
    response.Close()
    Return responseFromServer
End Function

JsonData byval包含：

{ "collapse_key":"DitIsEenUniekeIdentifier",
  "time_to_live":108,
  "delay_while_idle":true,
  "data": {
    "MessageId":1,
    "TestInformation":"BlieBloeBlaaaa tadaaa!"
   },
   "registration_ids":["APA91bFYQbSDzQDsoRrR3bnKtH_o72kQ7oiArg79WNz8qeCVoe6Kxu_BdcVftX1pGOfwLCLZbf_D3b7-V2yIaVasHxWXbn35nJO1bIiDzF84ifCHKJTyK3KiZmHZwAJliVIFcZFEVEsKTRiXWgpm9WWmnPrsbKvASy6FZyv4Eyfv-K526Q38Hjs"]
   }"

当我查看谷歌开发页面时，这似乎是正确的。http://developer.android.com/google/gcm/gcm.html

我以前可以用同样的功能发送到GCM，只是当时我使用的是纯文本。这是第一次尝试Json。我更改了邮件的标题。要求ContentType="内容类型：application/json"那是以前要求ContentType="application/x-www-form-urlencoded"

我用纯文本发送的数据：

Dim postData As String = String.Format("registration_id={0}&data.payload={1}&collapse_key={2}", ReceiverKey, Message, collaspeKey)

正在从GCM获取错误消息：MissingRegistration根据谷歌：

注册ID

检查请求是否包含注册ID（在纯文本消息中的registration_ID参数中，或在JSON中的regitration_ids字段中）。当错误代码为MissingRegistration时发生。

非常感谢安妮的帮助。

谨致问候。

Answer 1

这是错误的：

request.ContentType = "Content-Type: application/json"

更改为：

request.ContentType = "application/json"

简短解释：

由于您发送的内容类型无效，Google使用了默认的内容类型，即application/x-www-form-urlencoded;charset=UTF-8。预期此内容类型，但他们没有找到注册ID，这导致了MissingRegistration。