Realization of Android and Scoket communication under LAN

Because recent lab projects require that Android app data be sent to Winsock for storage under a local area network, this is a simple learning. PC side because it is another classmate to do, so do not explain.

On the Android side, first add the permissions:

    <uses-permission android:name= "Android.permission.INTERNET"/>  

The app interface is then simply designed--main.xml:

    <linearlayout android:orientation= "Horizontal" android:layout_width= "Match_parent"                  android:layout_height= "Wrap_content" > <!--define a text box that is used to receive user input--<edittext Android:id= "@+id/input" android:layout_width= "280DP" Android:layout_heig                  ht= "Wrap_content" android:inputtype= ""/> <button android:id= "@+id/send" Android:layout_width= "Match_parent" android:layout_height= "Wrap_content" Android:padd Ingstart= "8DP" android:text= "@string/send"/> </LinearLayout> <!--define a text box that Used to display information from the server--<textview android:id= "@+id/show" android:layout_width= "Match_par Ent "android:layout_height=" match_parent "android:gravity=" Top "android:background= "#ffff" andRoid:textsize= "14SP" android:textcolor= "#f000"/>   

The interface is as follows:

Create Clientthread.java to enable data transfer under LAN:

public class Clientthread implements Runnable{private Socket s;//defines the Handler object that sends messages to the UI thread private Handler handler;// The Handler object that defines the message that receives the UI thread public Handler revhandler;//the input stream corresponding to the socket processed by the thread bufferedreader br = Null;outputstream OS = null; Public Clientthread (Handler Handler) {this.handler = Handler;} public void Run () {try{s = new Socket ("192.168.1.133", 8040); br = new BufferedReader (New InputStreamReader ( S.getinputstream ())); OS = S.getoutputstream ();//Start a sub thread to read the server response data New Thread () {@Overridepublic void run () {String Content = null;//Constantly reads the contents of the socket input stream Try{while ((content = Br.readline ()) = null) {///each time the data from the server is read, send a message notifier// The interface displays the data message msg = new Message (); msg.what = 0x123;msg.obj = Content.tostring (); Handler.sendmessage (msg);}} catch (IOException e) {e.printstacktrace ();}}}. Start ();//Initialize Looperlooper.prepare () for current thread,//Create Revhandler Object revhandler = new Handler () {@Overridepublic void Handlemessage (Message msg) {//receives the user input data from the UI thread if (msg.what = = 0x345) {//writes the user's input in the text box to the network Try{os.write (Msg.obj.toStriNg () + "\ r \ n"). GetBytes ("Utf-8")); catch (Exception e) {e.printstacktrace ();}}}};/ /start Looperlooper.loop ();} catch (Sockettimeoutexception E1) {System.out.println ("Network connection timed out!! ");} catch (Exception e) {e.printstacktrace ();}}}

  Finally create Mainactivity.java to implement the acquisition of content sent in the app, and other functions:

The public class Mainactivity extends activity{//defines two text boxes on the interface edittext input; TextView show;//defines a button on the interface buttons send; Handler handler;//defines a child thread Clientthread clientthread that communicates with the server; @Overridepublic void OnCreate (Bundle savedinstancestate) { Super.oncreate (savedinstancestate); Setcontentview (r.layout.main); input = (EditText) Findviewbyid (r.id.input); send = (Button) Findviewbyid (r.id.send); show = (TextView) Findviewbyid (r.id.show); handler = new Handler ()//②{@ overridepublic void Handlemessage (Message msg) {//If the message is from a child thread if (msg.what = = 0x123) {//Append read content to the text box show.append ("\ n" + Msg.obj.toString ());}}; Clientthread = new Clientthread (handler);//client initiates Clientthread thread creates a network connection, reads data from the server new Thread (Clientthread). Start (); ①send.setonclicklistener (New Onclicklistener () {@Overridepublic void OnClick (View v) {try{//When the user presses the Send button, The data entered by the user is encapsulated into message//and then sent to the child thread by handlermessage msg = new Message (), msg.what = 0x345;msg.obj = Input.gettext (). toString (); ClientThread.revHandler.sendMessage (msg);//Empty input text box Input.settext ("");}catch (Exception e) {e.printstacktrace ();}});}} 

In this way, we realized the functions we wanted to transfer data to the PC.

Realization of Android and Scoket communication under LAN