Android定时器实现

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

方法一:Handler+Thread

[java] view
plain copy

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

[java] view
plain copy

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

[java] view
plain copy

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);

}

};

}