android延迟执行任务(刷新按钮旋转)

源码下载：http://download.csdn.net/detail/forwardyzk/7638597

在android中，有时候会进行延迟执行任务，几秒后自动的跳转的新界

面。下面以定时刷新为例，来介绍延迟执行刷新开始和结束。来介绍

三个方法：Thread，TimerTask，Handler。

activity_pre.xml

<span style="font-family:SimSun;font-size:18px;"><?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <ImageView        android:id="@+id/refresh"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_gravity="center"        android:src="@drawable/refresh" /></LinearLayout></span>

MainActivity.java

<span style="font-family:SimSun;font-size:18px;">package com.example.test;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.view.View;import android.view.View.OnClickListener;import android.view.animation.Animation;import android.view.animation.RotateAnimation;import android.widget.ImageView;public class MainActivity extends Activity {private static String TAG = MainActivity.class.getSimpleName();private RotateAnimation animation;// 旋转动画private ImageView refresh;// 刷新图片private Handler handler;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_pre);handler = new Handler() {@Overridepublic void handleMessage(Message msg) {if (msg.what == 1) {refresh.clearAnimation();}super.handleMessage(msg);}};refresh = (ImageView)findViewById(R.id.refresh);animation =new RotateAnimation(0, 359, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);animation.setDuration(500);animation.setRepeatCount(Animation.INFINITE);animation.setRepeatMode(Animation.RESTART);// 使用线程OnClickListener listener1 = new OnClickListener() {// 方法1@Overridepublic void onClick(View arg0) {refresh.setAnimation(animation);refresh.startAnimation(animation);new Thread(new Runnable() {@Overridepublic void run() {try {Thread.sleep(5000);} catch (InterruptedException e) {e.printStackTrace();}Message msg = new Message();msg.what = 1;handler.sendMessage(msg);}}).start();}};// 使用延时器OnClickListener listener2 = new OnClickListener() {@Overridepublic void onClick(View arg0) {refresh.setAnimation(animation);refresh.startAnimation(animation);// 方法2TimerTask task = new TimerTask() {public void run() {refresh.clearAnimation();}};Timer timer = new Timer();timer.schedule(task, 5000);}};// 使用消息机制OnClickListener listener3 = new OnClickListener() {@Overridepublic void onClick(View arg0) {refresh.setAnimation(animation);refresh.startAnimation(animation);// 方法3new Handler().postDelayed(new Runnable() {@Overridepublic void run() {// 延迟执行的代码refresh.clearAnimation();// 清楚动画，停止动画}}, 5000);// 5000毫秒执行，5秒}};// refresh.setOnClickListener(listener1);// refresh.setOnClickListener(listener2);refresh.setOnClickListener(listener2);}}</span>

可以根据自己的喜好和使用方便程度，确定使用那种方法，

我建议使用第三种方法，这种方便最简便

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