java - Connection between server and android -

i'm trying develop app instant messaging (like whatsapp). i'm confused type of connection should use: socket, http or other? have use non-standard java api? server use java , client use andoid (java). have tried socket connection without success. don't error nothing happens because device , server not connected(i don't know why).

this client class (android) sends messages:

public class sendmsg implements runnable {  private socket socket; string msg;  public sendmsg(string msg){     this.msg=msg;     }  @override public void run() {       try {         socket = new socket("ip_globale_server",5000);         socket.setsotimeout(5000);         bufferedwriter writer= new bufferedwriter(new outputstreamwriter(socket.getoutputstream()));         writer.write(msg);         writer.flush();     }     catch (ioexception e){         system.err.println("connection error");     }     finally{         if (socket!=null) {         try{socket.close();}         catch(ioexception e){}         }     }  } } 

this java server class waits connection:

public class receivemsg implements runnable {  serversocket server= null; socket connection=null; inputstream in; inputstreamreader inr; stringbuilder smsg;   public void run() {     system.out.print("server has started");      try {         server = new serversocket(5000);         system.out.println("i'm waiting connection");         connection = server.accept();         system.out.println("i'm connected "+ connection.tostring());         in = connection.getinputstream();         inr = new inputstreamreader(in,"ascii");         (int c= inr.read();c!=-1; c= inr.read()){             smsg.append((char)c);         }          //this class storing message         new store (smsg.tostring(),1,2);      }     catch(ioexception ex){}     {         try{         if (server != null)             server.close();          if (server != null)             server.close();          }         catch(ioexception e){          }     } 

could me start please. thank in advance.

i suggest using google cloud messaging here. has benefit once device runs app, can make register against gcm , can send them messages needed, way don't have struggle sockets close after amount of time.

this approach need have implement server (for instance, web server php) , make users communicate it, flow be:

1. your server sends broadcast message registered devices telling them have register against gcm service.

2. the devices message, , implement broadcastreceiver both latitude , longitude , send remote server, http://www.mysuperserver.com/getmsg.php, via post request.

3. your server processes parameters , save them or whatever need.

if want follow approach, steps have follow:

1. go https://console.developers.google.com. google account, register new project. provide api key , sender id.

2. you'll need make device register against project in gcm. can achieve importing google play services within project, , once done, alike this:

   googlecloudmessaging gcm = googlecloudmessaging.getinstance(context); final string regid = gcm.register("your_sender_id"); 

3. at time, gcm server knows user has registered whithin project , has given him regid.

4. the next step informing own remote server user has done so, , save somewhere regid has been given, can later send them messages. in client side, make http post request against server sending regid , process somethat this:

   $regid = $_post['regid'];  if (($regid) && ($ipaddr))   sql_query("insert gcm_subscribers(regid) values($regid')"); 

5. once done, know have registered against database. can select users , send them new messages (simulating multicast behavior).

   function sendnotification($registrationidsarray, $messagedata) {   $apikey = "your_api_key";    $headers = array("content-type:" . "application/json", "authorization:" . "key=" . $apikey);   $data = array(     'data' => $messagedata,     'registration_ids' => $registrationidsarray   );    $ch = curl_init();    curl_setopt( $ch, curlopt_httpheader, $headers );   curl_setopt( $ch, curlopt_url, "https://android.googleapis.com/gcm/send" );   curl_setopt( $ch, curlopt_ssl_verifyhost, 0 );   curl_setopt( $ch, curlopt_ssl_verifypeer, 0 );   curl_setopt( $ch, curlopt_returntransfer, true );   curl_setopt( $ch, curlopt_postfields, json_encode($data) );    $response = curl_exec($ch);   curl_close($ch);    return $response; } 

6. once in client, process gcm message , display accordingly. process messages i'm including few links below.

more this:

• reference on google cloud messaging

• android push notifications using google cloud messaging gcm - android example

• google cloud messaging using php

• connection between php (server) , android (client) using http , json

• notificaciones push android: google cloud messaging (gcm). implementación cliente (nueva versión) (spanish)