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;@Overridepublic 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 {@Overridepublic void run() {// TODO Auto-generated method stubwhile (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 blocke.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;@Overridepublic 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() {@Overridepublic 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 blocke.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);

}

};

}

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