The UDP transmission of Android

Note In addition to adding Internet permissions, add two lines of code

Strictmode.setthreadpolicy (New StrictMode.ThreadPolicy.Builder (). Detectdiskreads (). Detectdiskwrites (). Detectnetwork (). Penaltylog (). build ());
Strictmode.setvmpolicy (New StrictMode.VmPolicy.Builder (). Detectleakedsqlliteobjects (). Detectleakedclosableobjects (). Penaltylog (). Penaltydeath (). build ());

Import Java.io.ioexception;import Java.net.datagrampacket;import java.net.datagramsocket;import Java.net.inetaddress;import Java.net.socketexception;import Java.net.unknownhostexception;import Java.text.simpledateformat;import Java.util.date;import Java.util.uuid;import Android.annotation.SuppressLint; Import Android.os.bundle;import android.os.handler;import Android.os.message;import Android.os.strictmode;import Android.util.Log; @SuppressLint ("Newapi") Public classsocketudp {Thread mreceivethread;     Datagramsocket serverreceive;    Datagramsocket serversend; InetAddress Local=NULL; //Construction Method     Publicsocketudp () {Try{strictmode.setthreadpolicy (NewStrictMode.ThreadPolicy.Builder (). Detectdiskreads (). Detectdiskwrites (). Detectnetwork (). Penaltylog (). Build (            )); Strictmode.setvmpolicy (NewStrictMode.VmPolicy.Builder (). Detectleakedsqlliteobjects (). Detectleakedclosableobjects (). Penaltylog ().                       Penaltydeath (). build ()); if(serverreceive!=NULL) {serverreceive.close (); Serverreceive=NULL; } serverreceive=NewDatagramsocket (NULL); Serverreceive.setreuseaddress (true); Serverreceive.setbroadcast (true); Serverreceive=NewDatagramsocket (5061); Mreceivethread=NewThread (Updatethread);                                     Mreceivethread.start (); Local= Inetaddress.getbyname ("192.168.1.51"); //server.setreuseaddress (TRUE); }Catch(Exception e) {e.printstacktrace (); }              }    //Receive data processingFinal Handler Updatebarhandler =NewHandler () {@Override Public voidhandlemessage (Message msg) {SimpleDateFormat DF=NewSimpleDateFormat ("HH:mm:ss");//Set Date formatString Strdate=df.format (NewDate ()); String receivestring= (Msg.getdata ()). GetString ("Data"); Syslogactivity.addtolog (strdate+"  "+receivestring); LOG.E ("Receive:"+strdate,receivestring); //Receive data processing                   }      }; //A thread class that declares by using anonymous inner classesRunnable Updatethread =NewRunnable () { Public voidrun () {Try{                //get a Message object, the message class is provided by the Android systemMessage msg =NewMessage (); Bundle b=NewBundle (); //Defining Buffers                byte[] buffer =New byte[1024x768]; //define receive packetsDatagrampacket packet =Newdatagrampacket (buffer, buffer.length);  while(true) {msg=Updatebarhandler.obtainmessage (); //Receive Dataserverreceive.receive (packet); //determine if the data is received and then output the string                    if(Packet.getlength () >0) {String str=NewString (Buffer,0, packet. GetLength ()); B.putstring ("Data", str +"\ n");                          Msg.setdata (b); //adding a Message object to the queue of messagesupdatebarhandler.sendmessage (msg); }                  }              }            Catch(Exception ex) {LOG.E ("socketudp", ex.tostring ());        }        }      };  Public voidSendbuffer (byte[] buffer) {        Try{serversend=NewDatagramsocket (); Datagrampacket P=NewDatagrampacket (buffer, buffer.length, local,5060);            Serversend.send (P);                    Serversend.close (); } Catch(IOException e) {e.printstacktrace (); }    }         Public voidCloseme () {serverreceive.close (); }}

socketudp

The UDP transmission of Android