[Android]AndroidClinet與JavaServer TCP socket連線

之前一直在弄Android與java server的連線，
覺得明明Android API裡面有，
也是原來的java code
怎麼會不能跑呢?

先寫一隻用來測試socket的java server

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.net.ServerSocket;

import java.net.Socket;

public class TCPDesktopServer implements Runnable {

public static final String SERVERIP = "220.131.10.187";

public static final int SERVERPORT = 12345;

public void run() {

try {

System.out.println("S: Connecting...");

ServerSocket serverSocket = new ServerSocket(SERVERPORT);

while (true) {

Socket client = serverSocket.accept();

System.out.println("S: Receiving...");

try {

BufferedReader in = new BufferedReader(

new InputStreamReader(client.getInputStream()));

String str = in.readLine();

System.out.println("S: Received: '" + str + "'");

} catch (Exception e) {

System.out.println("S: Error");

e.printStackTrace();

} finally {

client.close();

System.out.println("S: Done.");

}

}

} catch (Exception e) {

System.out.println("S: Error");

e.printStackTrace();

}

}

public static void main(String a[]) {

Thread desktopServerThread = new Thread(new TCPDesktopServer());

desktopServerThread.start();

}

}

在寫一隻Android 手機Socket連線，
(From : http://www.androidres.com/?p=405  )

package com.AtestClient;

import java.io.BufferedWriter;

import java.io.IOException;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.net.InetAddress;

import java.net.Socket;

import java.net.UnknownHostException;

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

public class AtestClient extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

Socket socket;

try {

InetAddress serverAddr = InetAddress.getByName("220.131.10.187");

Log.d("TCP", "C: Connecting...");

try {

socket = new Socket(serverAddr, 12345);

String message = "AndroidRes,Where is my Pig (Android)?";

Log.d("TCP", "StringAfter");

try {

Log.d("TCP", "C: Sending: '" + message + "'");

PrintWriter out = new PrintWriter(new BufferedWriter(

new OutputStreamWriter(socket.getOutputStream())),

true);

out.println(message);

} catch (Exception e) {

Log.e("TCP", "S: Error", e);

} finally {

socket.close();

}

} catch (Exception e) {

}

} catch (UnknownHostException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}// TCPServer.SERVERIP

}

}

細微的修改網頁上的範例，
開啟了LogCat的功能，
去查找錯誤在哪裡。(開啟logcat http://blog.ben.idv.tw/2007/12/android-log.html ) 

測試server可以連線，
但是Clinet一直出現
unknow Socket error -1

 
在Google group 上發現解決方法
http://groups.google.com/group/android-developers/browse_thread/thread/28b416fafec6a84d?pli=1

原來這才是最重要的一步，
在AndroidManifest.xml檔案內加上 

 
 
Socket連線就建立成功了。