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anddev.org • View topic - Server does not receive message from client

Server does not receive message from client

Problems with WiFi, SQLite ,Bluetooth, WiMax, Proxies, etc...

Server does not receive message from client

Postby mike88 » Thu Nov 12, 2009 9:00 am

Hello, I have created a simple server and client both on android phone
or emulators. The code is as follows

Server:

Syntax: [ Download ] [ Hide ]
Using java Syntax Highlighting
  1.  
  2.  
  3.  
  4. import java.io.BufferedReader;
  5.  
  6. import java.io.InputStreamReader;
  7.  
  8. import java.net.ServerSocket;
  9.  
  10. import java.net.Socket;
  11.  
  12.  
  13.  
  14. import android.app.Activity;
  15.  
  16. import android.os.Bundle;
  17.  
  18. import android.util.Log;
  19.  
  20. import android.widget.TextView;
  21.  
  22.  
  23.  
  24. public class AndroidServer extends Activity {
  25.  
  26.    /** Called when the activity is first created. */
  27.  
  28.        public static TextView tv;
  29.  
  30.    @Override
  31.  
  32.    public void onCreate(Bundle savedInstanceState) {
  33.  
  34.        super.onCreate(savedInstanceState);
  35.  
  36. //        setContentView(R.layout.main);
  37.  
  38.  
  39.  
  40.        tv = new TextView(this);
  41.  
  42.        tv.setText("Main - server");
  43.  
  44.        setContentView(tv);
  45.  
  46.  
  47.  
  48.        Thread sThread = new Thread(new TCPServerTest());
  49.  
  50.  
  51.  
  52.        sThread.start();
  53.  
  54.    }
  55.  
  56. }
  57.  
  58.  
  59.  
  60. class TCPServerTest implements Runnable{
  61.  
  62.  
  63.  
  64.    public static final String SERVERIP = "10.0.2.15";
  65.  
  66.    public static final int SERVERPORT = 4444;
  67.  
  68.  
  69.  
  70.    public void run() {
  71.  
  72.         try {
  73.  
  74.              Log.d("TCP", "S: Connecting...");
  75.  
  76.  
  77.  
  78.              ServerSocket serverSocket = new ServerSocket
  79.  
  80. (SERVERPORT);
  81.  
  82.              while (true) {
  83.  
  84.                 Socket client = serverSocket.accept();
  85.  
  86.                 Log.d("TCP", "S: Receiving...");
  87.  
  88.                 try {
  89.  
  90.                      BufferedReader in = new BufferedReader(new
  91.  
  92. InputStreamReader(client.getInputStream()));
  93.  
  94.                      String str = in.readLine();
  95.  
  96.                      Log.d("TCP", "S: Received: '" + str + "'");
  97.  
  98.                      AndroidServer.tv.setText(str + " ------ " +
  99.  
  100. SERVERIP);
  101.  
  102.                    } catch(Exception e) {
  103.  
  104.                        Log.e("TCP", "S: Error", e);
  105.  
  106.                    } finally {
  107.  
  108.                         client.close();
  109.  
  110.                         Log.d("TCP", "S: Done.");
  111.  
  112.                    }
  113.  
  114.  
  115.  
  116.              }
  117.  
  118.  
  119.  
  120.         } catch (Exception e) {
  121.  
  122.           Log.e("TCP", "S: Error", e);
  123.  
  124.         }
  125.  
  126.    }
  127.  
  128. }
  129.  
  130.  
  131.  
  132.  
Parsed in 0.015 seconds, using GeSHi 1.0.8.4


Client:

Syntax: [ Download ] [ Hide ]
Using java Syntax Highlighting
  1.  
  2.  
  3.  
  4. import java.io.BufferedWriter;
  5.  
  6. import java.io.OutputStreamWriter;
  7.  
  8. import java.io.PrintWriter;
  9.  
  10. import java.net.InetAddress;
  11.  
  12. import java.net.Socket;
  13.  
  14.  
  15.  
  16. import android.app.Activity;
  17.  
  18. import android.os.Bundle;
  19.  
  20. import android.util.Log;
  21.  
  22. import android.widget.TextView;
  23.  
  24.  
  25.  
  26. public class AndroidClient extends Activity {
  27.  
  28.    /** Called when the activity is first created. */
  29.  
  30.        public TextView tv;
  31.  
  32.    @Override
  33.  
  34.    public void onCreate(Bundle savedInstanceState) {
  35.  
  36.        super.onCreate(savedInstanceState);
  37.  
  38. //        setContentView(R.layout.main);
  39.  
  40.  
  41.  
  42.        tv = new TextView(this);
  43.  
  44.        tv.setText("Main - client");
  45.  
  46.        setContentView(tv);
  47.  
  48.  
  49.  
  50.        Thread cThread = new Thread(new TCPClientTest());
  51.  
  52.  
  53.  
  54.        cThread.start();
  55.  
  56.    }
  57.  
  58. }
  59.  
  60.  
  61.  
  62. class TCPClientTest implements Runnable {
  63.  
  64.  
  65.  
  66.  
  67.  
  68.    public void run() {
  69.  
  70.         try {
  71.  
  72.  
  73.  
  74.           InetAddress serverAddr = InetAddress.getByName("10.0.2.2");
  75.  
  76.  
  77.  
  78.           Log.d("TCP", "C: Connecting...");
  79.  
  80.           Socket socket = new Socket(serverAddr, 5555);
  81.  
  82.           String message = "Hello from Client";
  83.  
  84.               try {
  85.  
  86.                Log.d("TCP", "C: Sending: '" + message + "'");
  87.  
  88.                PrintWriter out = new PrintWriter( new BufferedWriter
  89.  
  90. ( new OutputStreamWriter(socket.getOutputStream())),true);
  91.  
  92.  
  93.  
  94.                out.println(message);
  95.  
  96.                Log.d("TCP", "C: Sent.");
  97.  
  98.                  Log.d("TCP", "C: Done.");
  99.  
  100.  
  101.  
  102.             } catch(Exception e) {
  103.  
  104.                 Log.e("TCP", "S: Error", e);
  105.  
  106.                } finally {
  107.  
  108.                  socket.close();
  109.  
  110.                }
  111.  
  112.         } catch (Exception e) {
  113.  
  114.              Log.e("TCP", "C: Error", e);
  115.  
  116.         }
  117.  
  118.    }
  119.  
  120. }
  121.  
  122.  
  123.  
  124.  
Parsed in 0.013 seconds, using GeSHi 1.0.8.4


The problem can be seen from the log files

Server:

Syntax: [ Download ] [ Hide ]
Using java Syntax Highlighting
  1.  
  2.  
  3.  
  4. D/TCP     (  700): S: Connecting...
  5.  
  6.  
  7.  
  8.  
Parsed in 0.010 seconds, using GeSHi 1.0.8.4


Clinet:

Syntax: [ Download ] [ Hide ]
Using java Syntax Highlighting
  1.  
  2.  
  3.  
  4. D/TCP     (  703): C: Connecting...
  5.  
  6. D/TCP     (  703): C: Sending: 'Hello from Client'
  7.  
  8. I/global  (  703): Default buffer size used in BufferedWriter
  9.  
  10. constructor. It would be better to be explicit if an 8k-char buffer is
  11.  
  12. required.
  13.  
  14. D/TCP     (  703): C: Sent.
  15.  
  16. D/TCP     (  703): C: Done.
  17.  
  18.  
  19.  
  20.  
Parsed in 0.010 seconds, using GeSHi 1.0.8.4


Note when i run the program the server has id 5554 and the client id
5556 from the emulators.

I have used ./adb -s 5554 forward tcp:4444 tcp:5555

However the client message fails to send to the server. Does anyone
have any idea why?

I have tried doing ./adb -s 5556 forward tcp:5555 tcp:4444 in case
that was the problem but i had no luck.

Help would be very much appreciated.
mike88
Once Poster
Once Poster
 
Posts: 1
Joined: Thu Nov 12, 2009 8:52 am

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