当时遇到的主要难点在于TextView的内容不会刷新改变值，今天终于通过Timer和Handler实现了，分享给大家

import java.util.Timer;

import java.util.TimerTask;

import android.app.Activity;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;



public class AndroidLuckyActivity extends Activity

{

        private TextView textView;

        private Button button_start;

        private Button button_end;

        private Boolean begined = false;

        private Timer timer;

        private Handler handler;

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

    @Override

    public void onCreate(Bundle savedInstanceState) 

    {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        init();

        handler = new Handler()

        {

 public void handleMessage(Message msg)

                {

                        super.handleMessage(msg);

                        if(begined == true)

                        {

                                textView.setText("" +msg.what);

                        }

                        else if(begined == false)

                        {

　　　　　　　　　　　　　　　　　　　 textView.setText("" + msg.what);

                                timer.cancel();                        //Timer停止

                        }

                }

        };

    }



    void init()

    {

            textView = (TextView)this.findViewById(R.id.tv);

            button_start = (Button)this.findViewById(R.id.btn_start);

            button_end = (Button)this.findViewById(R.id.btn_end);

        button_start.setOnClickListener(new Button.OnClickListener()

        {

                        @Override

                        public void onClick(View v)

                        {

                                // TODO Auto-generated method stub

                                begined = true;

                                button_start.setEnabled(false);

                                button_end.setEnabled(true);

                                timer = new Timer();

                                timer.schedule(new TimerTask() 

                                {

                                        @Override

                                        public void run()

                                        {

                                                // TODO Auto-generated method stub

                                                Message message = new Message();

                                                message.what = (int) (Math.random() * 999 + 100);

                                                handler.sendMessage(message);

                                        }

                                }, 1000, 30);        //从1000ms即1s开始，30ms为数字改变周期

                        }

        });

        button_end.setOnClickListener(new Button.OnClickListener()

        {

                        @Override

                        public void onClick(View v)

                        {

                                // TODO Auto-generated method stub

                                begined = false;

                                button_start.setEnabled(true);

                                button_end.setEnabled(false);

                        }

        });

    }

}

运行图：