Android Network Programming Socket

1. Server-Side development

Create a Java program

public class MyServer {//definition saves all sockets, establishes a connection with the client to get a socketpublic static list<socket> socketlist = new ArrayList <Socket> ();p ublic static void Main (string[] args) throws IOException {ServerSocket server = new ServerSocket (8888); while (true) {System.out.println ("Start listening port 8888"); Socket socket = server.accept (); SYSTEM.OUT.PRINTLN ("Connect succeed.");   Socketlist.add (socket);//each time a client connects, a Serverthread thread is started for the Client Service new thread (new myserverrunnable (socket)). Start (); }}public Static class Myserverrunnable implements Runnable {//defines the current thread processing socketsocket socket = null;//The input for the socket processed by the thread Stream BufferedReader BufferedReader = null;public myserverrunnable (socket socket) {This.socket = socket;try {// Place data from the server-side input stream into the read buffer BufferedReader = new BufferedReader (New InputStreamReader (Socket.getinputstream ()));} catch (Exception e) {e.printstacktrace ();}} @Overridepublic void Run () {String content = null;//uses the loop to read the data sent by the client from the socket while (content = Readfromclient ())! = nul L) {//Traverse SOCEach socket in the ketlist, sends the read content to each socket once for (socket socket:MyServer.socketList) {OutputStream Outputstream;try { OutputStream = Socket.getoutputstream (); Outputstream.write (("Server:" + content + "\ n"). GetBytes ("Utf-8");} catch (IOException e) {e.printstacktrace ();}}}} Defines the read client information public String readfromclient () {try {return bufferedreader.readline ();} catch (Exception e) { E.printstacktrace ();} return null;}}}

2. Create an Android program

1) Layout

<linearlayout xmlns:android= "http://schemas.android.com/apk/res/android"    xmlns:tools= "http// Schemas.android.com/tools "    android:layout_width=" match_parent "    android:layout_height=" Match_parent "    android:gravity= "center"    android:orientation= "vertical"    tools:context= ". Mainactivity ">    <textview        android:id=" @+id/show "        android:layout_width=" Wrap_content        " android:layout_height= "Wrap_content"        android:text= "show received server-side data"/>    <button android:id=        "@+ Id/send "        android:layout_width=" match_parent "        android:layout_height=" wrap_content "        android:text= "Send data to server side"/></linearlayout>

2) Clientthread class

Package Com.example.testclient;import Java.io.bufferedreader;import Java.io.ioexception;import Java.io.inputstreamreader;import Java.io.outputstream;import Java.net.inetsocketaddress;import Java.net.Socket; Import Java.net.sockettimeoutexception;import Android.os.handler;import Android.os.looper;import Android.os.message;import Android.util.log;public class Clientthread implements Runnable {private Socket s;// Defines the handler object that sends a message to the UI thread handler handler;//defines the handler object that receives the UI thread handler revhandler;//the thread handles the input and output stream used by the socket BufferedReader BR = Null;outputstream OS = null;public clientthread (Handler Handler) {this.handler = Handler;} @Overridepublic void Run () {s = new Socket (); LOG.D ("111111111111", ""); try {//192.168.0.26 is the PC IP address.

 S.connect (New Inetsocketaddress ("192.168.0.26", 8888), 5000); LOG.D ("111111111111", "$$"); br = new BufferedReader (new InputStreamReader, S.getinputstream ()); OS = S.getoutputstream ();//Start a child thread to read the server corresponding data new Thread () {@Overridepublic void run () {String content = null;//continuously reads the contents of the socket input stream try {while (c Ontent = Br.readline ()) = null) {//each time the data from the server is read, the sent message notifier//interface displays the data message msg = new Message (); msg.what = 0X123;MSG.O BJ = Content;handler.sendmessage (msg); LOG.D ("111111111111", content);}} catch (IOException io) {io.printstacktrace ();}}}. Start ();//Initialize Looperlooper.prepare () for current thread,//Create Revhandler Object revhandler = new Handler () {@Overridepublic void Handlemessage (Message msg) {//receives the user input data in the UI thread if (msg.what = = 0x345) {//writes the user's input in the text box to the network try {os.write ("Client" + MSG.O Bj.tostring () + "\ r \ n"). GetBytes ("Utf-8");} catch (Exception e) {e.printstacktrace ();}}}};/ /start Looperlooper.loop ();} catch (sockettimeoutexception e) {message msg = new Message (); msg.what = 0x123;msg.obj = "Network connection timed out!" "; Handler.sEndmessage (msg);} catch (IOException e) {//TODO auto-generated catch Blocke.printstacktrace ();}}}

 3. Mainactivity

public class Mainactivity extends Activity {Handler handler;//defines the sub-thread Clientthread clientthread that communicates with the server; TextView Show; Button send, @Overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (r.layout.activity_main); show = (TextView) This.findviewbyid (r.id.show); send = (Button) This.findviewbyid (R.id.send); Send.setonclicklistener (new View.onclicklistener () {@Overridepublic void OnClick (View ARG0) {//TODO auto-generated method Stubtry {//When the user presses the button, encapsulates the data entered by the user into message//and then sends it to the child thread handlermessage msg = new Message () ; msg.what = 0x345;msg.obj = "Android Network programming--socket communication Programming"; ClientThread.revHandler.sendMessage (msg);} catch (Exception e) {e.printstacktrace ();}}}); Handler = new Handler () {@Overridepublic void handlemessage (Message msg) {//If the message comes from a child thread if (msg.what = = 0x123) {//reads the content appended Show.append ("\ n" + msg.obj.toString ()) in the text box; show.settextsize (50);}}; Clientthread = new Clientthread (handler);//client initiates Clientthread thread creates a network connection, reads data from the server new thread (Clientthread). Start ();}} 

Reference: http://blog.csdn.net/thanksgining/article/details/43561053

Android Network Programming Socket