Android's Simple UDP communication

An Android UDP communication programming step

Server side: 1. Create socket

2. Listening port

3. Receiving data

4. Implement data transmission

Client: directly implement data transmission

Two codes to implement a simple Udphelper class

1  PackageCom.br.delphi.centercontrol;2 3 ImportAndroid.os.Handler;4 ImportAndroid.os.Message;5 ImportAndroid.util.Log;6 7 Importjava.io.IOException;8 ImportJava.net.DatagramPacket;9 ImportJava.net.DatagramSocket;Ten Importjava.net.InetAddress; One Importjava.net.SocketException; A Importjava.net.UnknownHostException; -  - /** the * Created by Delphi on 16-6-11. -  */ -  Public classUdphelper { -     PrivateDatagramsocket socket;//declaring a socket +     Privatedatagrampacket Packet; -     PrivateHandler Handler;//Send the information you receive via HANDL to where you need it +  A     PrivateThread Serverthread; at      PublicUdphelper (FinalHandler Handler) -     { -         This. handler=handler; -Serverthread=NewThread (NewRunnable () {//UDP receive Data thread - @Override -             Public voidrun () { in                 while(true) { -                    byte[] Receivebytes =New byte[1024]; toPacket =NewDatagrampacket (receivebytes, receivebytes.length); +                    Try { - socket.receive (packet); theInetAddress client =packet.getaddress (); *String ClientIP = client.gethostaddress ();//get the IP address of the client $                        byte[] Receivedata = Packet.getdata ();//get the data sentPanax NotoginsengString Datastr =NewString (receivedata); -LOG.D ("UDP", ClientIP); theLOG.D ("UDP", datastr); +  AMessage msg =NewMessage ();//send data via message theMsg.what = 0; +Msg.obj =Datastr; - handler.sendmessage (msg); $}Catch(IOException e) { $ e.printstacktrace (); -                    } -                } the  -            }Wuyi        }); the  -     } Wu      Public  voidListen (intPort//initializing the Listening port -     { About         Try { $socket=NewDatagramsocket (port); - Serverthread.start (); -}Catch(SocketException e) { - e.printstacktrace (); A}Catch(IOException e) { + e.printstacktrace (); the         } -     } $  the      Public  voidSendData (byte[] data,string Ip,intPort) {//Send Data the         Try { thepacket=NewDatagrampacket (Data,data.length,inetaddress.getbyname (Ip), port); the             if(socket==NULL) -socket=NewDatagramsocket (); in socket.send (packet); the}Catch(unknownhostexception e) { the e.printstacktrace (); About}Catch(IOException e) { the e.printstacktrace (); the         } the  +     } -  the      Public  voidSendData (String data,string Ip,intPort//Send character data, note the encoding format for sendingBayi     { the         byte[] tmp=data.getbytes (); the SendData (tmp,ip,port); -     } -      Public  voidClose ()//Close Socket the     { the         if(socket!=NULL) the socket.close (); the     } -}


Three simple to use

1  Private  StaticHandler Handler;2     PrivateUdphelper UDP;3 4 @Override5     protected voidonCreate (Bundle savedinstancestate) {6         Super. OnCreate (savedinstancestate);7 Setcontentview (r.layout.activity_main);8 9 Ten  OneButton mode1button=(Button) Findviewbyid (R.id.button); AButton mode2button=(Button) Findviewbyid (r.id.button2); -Button mode3button=(Button) Findviewbyid (r.id.button3); -  the         FinalEditText edittext=(EditText) Findviewbyid (r.id.edittext); -         FinalTextView textview=(TextView) Findviewbyid (R.ID.TEXTVIEW2); -  -Mode1button.setonclicklistener (NewView.onclicklistener () { + @Override -              Public voidOnClick (view view) { +  A             } at         }); -  -Mode2button.setonclicklistener (NewView.onclicklistener () { - @Override -              Public voidOnClick (view view) { -  in  -                //Toast Toast=toast.maketext (This, "Hello",); toTextview.settext ("Hello,world"); +             } -         }); the  *Mode3button.setonclicklistener (NewView.onclicklistener () { $ @OverridePanax Notoginseng              Public voidOnClick (view view) { -                 NewThread (NewRunnable () { the @Override +                      Public voidrun () { AString str= "Hello"; the                         byte[] Data=str.getbytes (); +Udp.senddata (data, "192.168.0.107", 9000); -                     } $ }). Start (); $  -             } -         }); the  -Handler=NewHandler () {Wuyi @Override the              Public voidhandlemessage (Message msg) -             { Wu                 if(msg.what==0) -                 { About Textview.settext ((String) msg.obj); $                 } -             } -  -         }; Audp=NewUdphelper (handler); +Udp.listen (8000); the  -}

Android's Simple UDP communication