java - Good approach for my specific issue -

i wrote client(android smartphone)-server(java)-program.

it's practice , till sending string server saving file.

currently want implement new feature sending gps coordinates every 5 minutes server , saving it.

for i'd set alarmmanager receiving broadcast every 300000ms (or 5 minutes).

when receiving broadcast wanted establish connection server:

alarmreceiver.class:

    public class alarmreceiver extends broadcastreceiver {      @override     public void onreceive(context context, intent intent) {         // todo auto-generated method stub         log.e("alarmreceiver","received alarm");         mainactivity activity = (mainactivity) context;         activity.cconnect = new connectionthread(activity.clientserver, activity.out);         activity.cconnect.start();     } 

}

connectionthread.class:

    public class connectionthread extends thread {      socket clientserver;     bufferedwriter out;      public connectionthread(socket clientserver_, bufferedwriter out_) {         // todo auto-generated constructor stub         this.clientserver = clientserver_;         this.out = out_;     }      @override     public void run() {         // todo auto-generated method stub         super.run();         try {             clientserver = new socket(mainactivity.dstname, mainactivity.dstport);              out = new bufferedwriter(new outputstreamwriter(clientserver.getoutputstream()));             out.write("alarm received"); //currently sending string             out.flush();             out.close();             clientserver.close();         } catch (unknownhostexception e) {             // todo auto-generated catch block             e.printstacktrace();         } catch (ioexception e) {             // todo auto-generated catch block             e.printstacktrace();         }     } } 

where in mainactivity.class declared following:

protected static string dstname = ... protected static int dstport = ... public socket clientserver; public bufferedwriter out; private alarmmanager alarmmgr; private static int repeatalarmevery = 30000; private static int firstalarmafter = repeatalarmevery;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);... 

my problem is, afraid trying transmit text while alarmreceiver received broadcast , has established connection on same port.. decided have 1 socket-object called clientserver , way can check if clientserver != null -> do not establish new connection, instead use existing one.

but trying run client-program on emulator getting following error:

06-03 19:24:29.969: e/androidruntime(2186): caused by: java.lang.classcastexception: android.app.receiverrestrictedcontext cannot cast com.example.clientservercommunication.mainactivity 06-03 19:24:29.969: e/androidruntime(2186):     @ com.example.clientservercommunication.alarmreceiver.onreceive(alarmreceiver.java:14) 

what think/see context received broadcast restricted , not allowed cast activity mainactivity. not able access clientsocket , out mainactivity.class.

now have 2 solutions in mind:

1) declaring clientsocket , out static.

2) establish different connection (different port) text transmitting avoiding conflict between transmitting text , gps coordinates. e.g. text transmitting port 50000, gps data transmitting on port 50001

question:

which 1 better(regarding memory leak if there etc., not regarding opinion e.g. because solution better etc.)/ more common approach or there better design pattern/solution achieve want.

it important me support right pattern because sick of trying without enough background knowledge running tons of problems. hope described issue well.