android客户端能给 服务器发送数据，但是却无法读取从服务器返回的数据，高手帮下忙吧！！
写的一个简单的测试，android手机客户端向服务器发送一个字符串，服务器接收到字符串后，把字符串加工，再返回到客户端，
在客户端用TextView控件将获取的打印出来。。。我是想用多线程来实现的
这是android客户端的代码
package cn.bzu.edu.Thread;import android.app.Activity;import android.graphics.Canvas;import android.os.Bundle;import android.widget.TextView;public class THREAD_1_ACTIVITY extends Activity { /** Called when the activity is first created. */ int x=1; TextView tv; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); tv=(TextView)findViewById(R.id.myTextview); AndroidThread thread=new AndroidThread(tv); } }//AndroidThread类package cn.bzu.edu.Thread;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.net.InetAddress;import java.net.InetSocketAddress;import java.net.Socket;import java.net.UnknownHostException;import android.widget.TextView;public class AndroidThread implements Runnable { TextView myTextView; Socket socket; DataInputStream dis=null; DataOutputStream dos=null; public AndroidThread(TextView tv) { // TODO Auto-generated constructor stub myTextView = tv; Thread thread=new Thread(this); socket=new Socket(); try { InetAddress address=InetAddress.getByName("10.3.5.136"); InetSocketAddress socketAddress=new InetSocketAddress(address,6666); socket.connect(socketAddress); dis=new DataInputStream(socket.getInputStream()); dos=new DataOutputStream(socket.getOutputStream()); } catch (UnknownHostException e) { tv.setText("socket"); e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } thread.start(); } @Override public void run() { // TODO Auto-generated method stub String s; try { //myTextView.setText("execute run method()"); if(socket.isConnected()){ if(socket!=null){ dos.writeUTF("POST"); myTextView.setText("post"); s=dis.readUTF(); myTextView.setText(s); }else { myTextView.setText("socket is null"); } }else { myTextView.setText("socket NOT CONNECTION"); } } catch (Exception e) { // TODO Auto-generated catch block } }}