sockets - Android DatagramSocket error message: EADDRINUSE (Address already in use) -


i trying write simple android chat app. have created service class handles networking communication. datagramsocket binding in separate thread. once in while getting error , app crashes:

java.net.bindexception: bind failed: eaddrinuse (address in use) @ libcore.io.iobridge.bind(iobridge.java:89) @ java.net.plaindatagramsocketimpl.bind(plaindatagramsocketimpl.java:68) @ java.net.datagramsocket.createsocket(datagramsocket.java:133) @ java.net.datagramsocket.<init>(datagramsocket.java:78)

and code prodruces it. error occur on line new datagramsocket how can avoid error? thank you.

private class comthread extends thread {          private static final int bcast_port = 8779;         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);                  if (msocket == null) {                     msocket = new datagramsocket(bcast_port);                     msocket.setreuseaddress(true);                     msocket.setbroadcast(true);                 }                         } catch (ioexception e) {                 log.e(tag, "could not make socket", e);             }         }

you need set so_reuseaddr before binding. don't specify port in constructor - create unbound socket instead datagramsocket(null), set options, bind() explicitly.


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