Android三种实现定时器的方法

原博客：http://blog.csdn.net/yhm2046/article/details/8213629

方法一:Handler+Thread

    package com.xunfang.handerDemo;  
      
    import android.app.Activity;  
    import android.os.Bundle;  
    import android.os.Handler;  
    import android.os.Message;  
    import android.widget.TextView;  
      
    /** 
     * handler定时器 
     *  
     * @author Smalt 
     *  
     */  
    public class HanderDemoActivity extends Activity {  
        TextView tvShow;  
        private int i = 0;  
      
        @Override  
        public void onCreate(Bundle savedInstanceState) {  
            super.onCreate(savedInstanceState);  
            setContentView(R.layout.main);  
            tvShow = (TextView) findViewById(R.id.tv_show);  
            new Thread(new ThreadShow()).start();  
        }  
      
        // handler类接收数据  
        Handler handler = new Handler() {  
            public void handleMessage(Message msg) {  
                if (msg.what == 1) {  
                    tvShow.setText(Integer.toString(i++));  
                    System.out.println("receive....");  
                }  
            };  
        };  
      
        // 线程类  
        class ThreadShow implements Runnable {  
      
            @Override  
            public void run() {  
                // TODO Auto-generated method stub  
                while (true) {  
                    try {  
                        Thread.sleep(1000);  
                        Message msg = new Message();  
                        msg.what = 1;  
                        handler.sendMessage(msg);  
                        System.out.println("send...");  
                    } catch (Exception e) {  
                        // TODO Auto-generated catch block  
                        e.printStackTrace();  
                        System.out.println("thread error...");  
                    }  
                }  
            }  
        }  
    }  

方法二:Handler类自带的postDelyed

    package com.xunfang.handerDemo;  
      
    import android.app.Activity;  
    import android.os.Bundle;  
    import android.os.Handler;  
    import android.widget.TextView;  
      
    /** 
     * handler定时器使用postDelyed实现 
     *  
     * @author Smalt 
     *  
     */  
    public class HanderDemoActivity extends Activity {  
        TextView tvShow;  
        private int i = 0;  
        private int TIME = 1000;  
      
        @Override  
        public void onCreate(Bundle savedInstanceState) {  
            super.onCreate(savedInstanceState);  
            setContentView(R.layout.main);  
            tvShow = (TextView) findViewById(R.id.tv_show);  
            handler.postDelayed(runnable, TIME); //每隔1s执行  
        }  
      
        Handler handler = new Handler();  
        Runnable runnable = new Runnable() {  
      
            @Override  
            public void run() {  
                // handler自带方法实现定时器  
                try {  
                    handler.postDelayed(this, TIME);  
                    tvShow.setText(Integer.toString(i++));  
                    System.out.println("do...");  
                } catch (Exception e) {  
                    // TODO Auto-generated catch block  
                    e.printStackTrace();  
                    System.out.println("exception...");  
                }  
            }  
        };  
      
    }  

方法三:Handler+Timer+TimerTask

    package com.xunfang.handerDemo;  
      
    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.widget.TextView;  
      
    /** 
     * 定时器实现:Handler+Timer+TimerTask 
     *  
     * @author Smalt 
     *  
     */  
    public class HanderDemoActivity extends Activity {  
        TextView tvShow;  
        private int i = 0;  
        private int TIME = 1000;  
      
        @Override  
        public void onCreate(Bundle savedInstanceState) {  
            super.onCreate(savedInstanceState);  
            setContentView(R.layout.main);  
            tvShow = (TextView) findViewById(R.id.tv_show);  
            timer.schedule(task, 1000, 1000); // 1s后执行task,经过1s再次执行  
        }  
      
        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);  
            }  
        };  
    }