使用 c# .net 发送带有图像的 GCM 推送通知（适用于 android 应用程序）

Question

i am using this c# code to send push notification using GCM site but i also want to send image with notification title and message. please tell me how this can be achieved. i am trying to add "data.image" parameter to add image with notification but on getting notification image is not getting added.

i have also passed "data.image" with image url that can be accessed globally but nothing is happening.

 var applicationID = "some_id";
            // SENDER_ID is nothing but your ProjectID (from API Console- google code)//                                          
            var SENDER_ID = "My-Id";
            var value = message;
            var title = titl;
            //var image = "https://dl.dropboxusercontent.com/u/887989/antshot.png";


            //var imgstat = "http://justcash.co.in/img/logo0011.png";
            WebResponse tResponse;
            WebRequest tRequest = WebRequest.Create("https://android.googleapis.com/gcm/send");
            tRequest.Method = "post";
            tRequest.ContentType = " application/x-www-form-urlencoded;charset=UTF-8";
            tRequest.Headers.Add(string.Format("Authorization: key={0}", applicationID));

            tRequest.Headers.Add(string.Format("Sender: id={0}", SENDER_ID));
            string postData = "collapse_key=score_update&time_to_live=1000&delay_while_idle=1&data.title=" + title + "&data.message="
                 + value + "&data.time=" + System.DateTime.Now.ToString() + "&registration_id=" + regId + "&data.image=" + "some-image-source";

            //string postData = "collapse_key=score_update&time_to_live=1000&delay_while_idle=1&data.title=" + title + "&data.message="
            //    + value + "&data.time=" + System.DateTime.Now.ToString() + "&data.image=" + image + "&registration_id=" + regId + "";


            Console.WriteLine(postData);
            Byte[] byteArray = Encoding.UTF8.GetBytes(postData);
            tRequest.ContentLength = byteArray.Length;

            dataStream = tRequest.GetRequestStream();
            dataStream.Write(byteArray, 0, byteArray.Length);
            dataStream.Close();

            tResponse = tRequest.GetResponse();
            dataStream = tResponse.GetResponseStream();

            tReader = new StreamReader(dataStream);

            sResponseFromServer = tReader.ReadToEnd();
            tReader.Close();
            dataStream.Close();
            tResponse.Close();

Answer 1

You cannot directly send an image in GCM, you need to add url of the image in data, which handled on the receiver side to show result

GCM are limited in size and works as JSON