Android三种实现定时器的方法

方法一、使用Handler和Thread（线程）实现定时器

代码如下:
package com.xunfang.handerDemo;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.TextView;
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() {
            while (true) {
                try {
                    Thread.sleep(1000);
                    Message msg = new Message();
                    msg.what = 1;
                    handler.sendMessage(msg);
                    System.out.println("send...");
                } catch (Exception e) {
                    e.printStackTrace();
                    System.out.println("thread error...");
                }
            }
        }
    }
}

方法二、使用Handler类自带的postDelyed实现定时器

代码如下:
package com.xunfang.handerDemo;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.widget.TextView;
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、使用Handler、Timer和TimerTask三个Android类实现定时器

代码如下:
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;
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() {
            // 发送消息
            Message message = new Message();
            message.what = 1;
            handler.sendMessage(message);
        }
    };
}

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