Android三种实现定时器的方法

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);
}
};
}

http://blog.csdn.net/yhm2046/article/details/8213629/#