定时器实现:Handler+Timer+TimerTask

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http://blog.csdn.net/u012184853/article/details/50156643

定时器实现:Handler+Timer+TimerTask 其实明白一点就好理解了， java.util.TimerTask implements java.lang.Runnable ，所以TimerTask就是一个线程

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

import com.example.test.R;

import android.app.Activity;  
import android.os.Bundle;  
import android.os.Handler;  
import android.os.Message;  
import android.widget.TextView;  

public class TimerActivity extends Activity {  

    TextView tvShow;  
    private int i = 0;  

    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.handerdemoactivity);  
        tvShow = (TextView) findViewById(R.id.tv_show);
        // 1s后执行task,经过1s再次执行  
        timer.schedule(task, 1000, 1000); 
    }  

    Handler handler = new Handler() {  
        public void handleMessage(Message msg) {  
            if (msg.what == 1) {  
                tvShow.setText(Integer.toString(i++));  
            }  
            super.handleMessage(msg);  
        };  
    };  
    Timer timer = new Timer();  
    TimerTask task = new TimerTask() {  

        @Override  
        public void run() {  
            // 需要做的事:发送消息  
            Message message = new Message();  
            message.what = 1;  
            handler.sendMessage(message);  
        }  
    };  

源码下载地址

http://download.csdn.net/detail/u012184853/9321597