android 序列化 class not found

最近在做你画我猜。使用socket传递对象，下面的代码如果是java程序的话是没问题的，但是改到android下却有问题了在server 端提示，而且我在服务端也定义了这个Data类的。
java.lang.ClassNotFoundException: com.DrawAndGuess.Data class not found 
其中 com.DrawAndGuess.Data的代码如下package com.DrawAndGuess;import java.io.Serializable;public  class Data implements Serializable{
private int x,y;
    Data(int x,int y){
     this.x = x;
     this.y = y;
    }
public int getX() {
return x;
} public void setX(int x) {
this.x = x;
} public int getY() {
return y;
} public void setY(int y) {
this.y = y;
}
private static final long serialVersionUID = 1L;

}
package com.DrawAndGuess;import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.net.Socket;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;public class DrawAndGuessActivity extends Activity {
DrawAndGuessSurfaceView drawAndGuessSurfaceView;


@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
drawAndGuessSurfaceView = new DrawAndGuessSurfaceView(this);
setContentView(drawAndGuessSurfaceView);


try{

Data data = new Data(3,4);
Socket socketConnection = new Socket("172.18.43.59",8889);
ObjectOutputStream clientOutStream = new ObjectOutputStream(socketConnection.getOutputStream());
ObjectInputStream clientInputStream = new ObjectInputStream(socketConnection.getInputStream());
    
System.out.println("connect....");
clientOutStream.writeObject(data);


data = (Data) clientInputStream.readObject();
System.out.println("Receive from server:");
System.out.println("x: "+ data.getX() + "y: " + data.getY());

clientOutStream.close();
clientInputStream.close(); 

}catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}   
}服务器如下package testsocket.com;import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.net.ServerSocket;
import java.net.Socket;public class Server {
public static void main(String[] arg) {
Data data = null;
try{
ServerSocket socketConnection = new ServerSocket(11111);
System.out.println("Server waiting");
Socket  pipe = socketConnection.accept();
ObjectInputStream serverInputStream = new ObjectInputStream(pipe.getInputStream());
ObjectOutputStream serverOutputStream = new ObjectOutputStream(pipe.getOutputStream());
data = (Data) serverInputStream.readObject();
System.out.println("Receive from client:");
System.out.println("x: "+ data.getX() + "y: " + data.getY());
data.setX(5);
data.setY(6);
serverOutputStream.writeObject(data);
serverInputStream.close();
serverOutputStream.close();
    System.out.println("server receive");
}catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}


}