android - NetworkOnMainThreadException even though there is a background thread inside service -

i developing udp chat app. network processing inside thread in service. still getting error message 3.1 , 4.0 oeprating system. versions 2.3 , below working fine. question: should create 2 apps, 1 version 2.3 , below , 1 version 3.0 , higher? error happens when write(byte[] out) method called according logcat.

if disable strictmode ics app working fine.

public class chatservice extends service {      private binder binder;     private comthread comthread;      public ibinder onbind(intent intent) {         return binder;     }      public void oncreate() {     }      public int onstartcommand(intent intent, int flags, int startid) {         binder = new chatservicebinder();         start();         return super.onstartcommand(intent, flags, startid);     }      public synchronized void start() {         comthread = new comthread();         comthread.start();     }      public void ondestroy() {         stop();     }      public void write(byte[] out) {         comthread.write(out);     }      public synchronized void stop() {         if (comthread != null) {             comthread.cancel();             comthread = null;         }     }      private class comthread extends thread {         private static final int bcast_port = 2562;     datagramsocket msocket;     inetaddress mybcastip, mylocalip;      public comthread() {          try {             mybcastip = getbroadcastaddress();             if (d)                 log.d(tag, "my bcast ip : " + mybcastip);              mylocalip = getlocaladdress();             if (d)                 log.d(tag, "my local ip : " + mylocalip);              msocket = new datagramsocket(bcast_port);             msocket.setbroadcast(true);          } catch (ioexception e) {             log.e(tag, "could not make socket", e);         }     }      public void run() {          try {              byte[] buf = new byte[1024];             if (d)                 log.d(tag, "run(), com thread startet");             // listen on socket receive messages             while (true) {                 datagrampacket packet = new datagrampacket(buf, buf.length);                 msocket.receive(packet);                  inetaddress remoteip = packet.getaddress();                 if (remoteip.equals(mylocalip))                     continue;                  string s = new string(packet.getdata(), 0,                         packet.getlength());                 if (d)                     log.d(tag, "run(), " + s);                  message msg = new message();                 msg.obj = s;                 msg.arg1 = messagehandler.msg_in;                 state.gethandler().sendmessage(msg);              }         } catch (ioexception e) {             e.printstacktrace();         }     }      /**      * write broadcast packet.      */     public void write(byte[] buffer) {         try {             string data = new string(buffer);             datagrampacket packet = new datagrampacket(data.getbytes(),                     data.length(), mybcastip, bcast_port);             msocket.send(packet);         } catch (exception e) {             log.e(tag, "write(), exception during write", e);         }     }      /**      * calculate broadcast ip need send packet along.      */     private inetaddress getbroadcastaddress() throws ioexception {         wifimanager mwifi = (wifimanager) state                 .getsystemservice(context.wifi_service);          wifiinfo info = mwifi.getconnectioninfo();         if (d)             log.d(tag, "\nwifi status: " + info.tostring());          // dhcpinfo simple object retrieving results of dhcp         // request         dhcpinfo dhcp = mwifi.getdhcpinfo();         if (dhcp == null) {             log.d(tag, "could not dhcp info");             return null;         }          int broadcast = (dhcp.ipaddress & dhcp.netmask) | ~dhcp.netmask;         byte[] quads = new byte[4];         (int k = 0; k < 4; k++)             quads[k] = (byte) ((broadcast >> k * 8) & 0xff);          // returns inetaddress corresponding array of bytes.         return inetaddress.getbyaddress(quads); // high order byte                                                 // quads[0].     }      private inetaddress getlocaladdress() throws ioexception {          try {             (enumeration<networkinterface> en = networkinterface                     .getnetworkinterfaces(); en.hasmoreelements();) {                 networkinterface intf = en.nextelement();                 (enumeration<inetaddress> enumipaddr = intf                         .getinetaddresses(); enumipaddr.hasmoreelements();) {                     inetaddress inetaddress = enumipaddr.nextelement();                     if (!inetaddress.isloopbackaddress()) {                         return inetaddress;                     }                 }             }         } catch (socketexception ex) {             log.e(tag, ex.tostring());         }         return null;     }      public void cancel() {         try {             msocket.close();         } catch (exception e) {             log.e(tag, "close() of connect socket failed", e);         }     } }  public class chatservicebinder extends binder {     private chatservice service = chatservice.this;      public chatservice getservice() {         return service;     } }         

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thanks.

a little late, , not super great answer, on android 3+ runnable won't interpreted permitted unless it's inside service (not sub-class have it). know limiting check given freedom have create pretty want want, again udp multicasting isn't android developers mess with. hope helps.