android - How to send push messages to multiple users using C2DM? -

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so far have succeeded send messages 1 device using registration id , authtoken signed c2dm role account. have send messages multiple users . dont know how achieve this.

could overcome issue.

java servlet code,

public void doget(httpservletrequest req, httpservletresponse resp)         throws ioexception {           resp.setcontenttype("text/plain");         stringbuilder data = new stringbuilder();          data.append("registration_id=" + serverconfig.deviceregistrationid_s);          // collapse key grouping messages , last sent message         // same key going sent phone when phone         // ready message if not beginning         data.append("&collapse_key=test");            // here message sending, key1 can changed whant         // or if whant send more 1 can (i think, not tested         // yet), testing message here.         data.append("&data.key1=testing message c2dm");          // if want message wait phone not idle set         // parameter

// data.append("&delay_while_idle=1");

        byte[] postdata = data.tostring().getbytes("utf-8");          stringbuilder sb = new stringbuilder();          sb.append(serverconfig.authtoken + " - ");          try {             // send data             url url = new url("https://android.clients.google.com/c2dm/send");              httpurlconnection conn = (httpurlconnection) url.openconnection();             conn.setdooutput(true);             conn.setusecaches(false);             conn.setrequestmethod("post");             conn.setrequestproperty("content-type",                     "application/x-www-form-urlencoded;charset=utf-8");             conn.setrequestproperty("content-length",                     integer.tostring(postdata.length));             conn.setrequestproperty("authorization", "googlelogin auth="                     + serverconfig.authtoken);              outputstream out = conn.getoutputstream();             out.write(postdata);             out.close();              integer responsecode = conn.getresponsecode();             if (responsecode.equals(503)) {                 // server temporarily unavailable                 sb.append("responsecode = " + responsecode);             } else {                 if (responsecode.equals(401)) {                     // auth_token used validate sender invalid                     sb.append("responsecode = " + responsecode);                 } else {                     if (responsecode.equals(200)) {                          // check updated token header                         string updatedauthtoken = conn                                 .getheaderfield("update-client-auth");                         if (updatedauthtoken != null) {                             serverconfig.authtoken = updatedauthtoken;                             sb.append("updatedauthtoken = \""                                     + updatedauthtoken + "\"");                         }                          string responseline = new bufferedreader(                                 new inputstreamreader(conn.getinputstream()))                                 .readline();                          if (!sb.tostring().equals("")) {                             sb.append(" - ");                         }                          if (responseline == null || responseline.equals("")) {                             sb.append("got responsecode "                                     + responsecode                                     + " empty response google ac2dm server");                         } else {                             sb.append(responseline);                         }                     } else {                         sb.append("responsecode = " + responsecode);                     }                 }             }         } catch (exception e) {             if (!sb.tostring().equals("")) {                 sb.append(" - ");             }              sb.append("exception: " + e.tostring());         }          resp.getwriter().println(sb.tostring());      }

i know you're dealing c2dm, google released c2dm successor, gcm allows sending notification 1000 devices in 1 http post. if app not in market yet, suggest migrating using gcm before it's deployed. posting notification multiple devices in gcm simple putting device registration ids in json array , send google's server, this:

{    "registrations_ids": [reg_id1, reg_id2, reg_id3, reg_id10, reg_id100],   "data" : "payload" }

but if insist on using c2dm, need loop sending notification, iterating through device registration ids.


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