Android Timer的应用示例

package com.hyzhou.timerdemo1;

import java.util.Timer;
import java.util.TimerTask;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.app.Activity;

public class MainActivity extends Activity {

     // 定义计时器
    Timer timer=new Timer();
    
    private TextView tv;
    private Button bt;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //定义UI组件
        tv=(TextView)findViewById(R.id.tv);
        bt=(Button)findViewById(R.id.bt);
        
        Log.i("hyzhou", Thread.currentThread().getName());
        //定义Handler
         final Handler handler=new Handler(){

            @Override
            public void handleMessage(Message msg) {
                // TODO Auto-generated method stub
                super.handleMessage(msg);
                //handler处理消息
                if (msg.what>0) {
                    tv.setText(" "+msg.what);
                }
                else {
                    //在handler里可以更改UI组件
                    tv.setText("开始点火");
                    timer.cancel();
                }
            }
            
        };
        // 定义按钮的点击监听器
        bt.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                timer.schedule(new TimerTask() {
                    int i=10;
                    // TimerTask 是个抽象类,实现的是Runable类
                    @Override
                    public void run() {
                        // TODO Auto-generated method stub
                        Log.i("hyzhou", Thread.currentThread().getName());
                        //定义一个消息传过去
                        Message message=new Message();
                        message.what=i--;
                        handler.sendMessage(message);
                    }
                }, 1000, 2000);
            }
        });
        
    }

}

 参考：http://www.360doc.com/content/11/1129/15/6541311_168365884.shtml