android利用Chronometer实现倒计时已封装，可直接使用

项目需要实现一个计时的功能,利用Chronometer虽然可以很方便的实现计时功能,但需要的却是一个倒计时控件. 百度了一下方法不少，倒计时的却没有，于是用Chronometer封装了一个倒计时的类,本着开源的精神，分享给大家！

/** Automatically generated file. DO NOT MODIFY */
package com.example.anticlockwisedemo;

public final class BuildConfig {
    public final static boolean DEBUG = true;
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件        475  2015-02-07 23:42  AnticlockwiseDemo\.classpath

     文件        853  2015-02-07 23:42  AnticlockwiseDemo\.project

     文件        177  2015-02-07 23:42  AnticlockwiseDemo\.settings\org.eclipse.jdt.core.prefs

     文件        900  2015-02-07 23:42  AnticlockwiseDemo\AndroidManifest.xml

     文件        900  2015-02-07 23:42  AnticlockwiseDemo\bin\AndroidManifest.xml

     文件       1474  2015-02-07 23:50  AnticlockwiseDemo\bin\classes\com\example\anticlockwisedemo\Anticlockwise$1.class

     文件        296  2015-02-07 23:50  AnticlockwiseDemo\bin\classes\com\example\anticlockwisedemo\Anticlockwise$OnTimeCompleteListener.class

     文件       3225  2015-02-07 23:50  AnticlockwiseDemo\bin\classes\com\example\anticlockwisedemo\Anticlockwise.class

     文件        367  2015-02-07 23:42  AnticlockwiseDemo\bin\classes\com\example\anticlockwisedemo\BuildConfig.class

     文件       1080  2015-02-08 00:02  AnticlockwiseDemo\bin\classes\com\example\anticlockwisedemo\MainActivity$1.class

     文件       1704  2015-02-08 00:02  AnticlockwiseDemo\bin\classes\com\example\anticlockwisedemo\MainActivity.class

     文件        373  2015-02-07 23:56  AnticlockwiseDemo\bin\classes\com\example\anticlockwisedemo\R$attr.class

     文件        494  2015-02-07 23:56  AnticlockwiseDemo\bin\classes\com\example\anticlockwisedemo\R$dimen.class

     文件        440  2015-02-07 23:56  AnticlockwiseDemo\bin\classes\com\example\anticlockwisedemo\R$drawable.class

     文件        619  2015-02-07 23:56  AnticlockwiseDemo\bin\classes\com\example\anticlockwisedemo\R$id.class

     文件        436  2015-02-07 23:56  AnticlockwiseDemo\bin\classes\com\example\anticlockwisedemo\R$layout.class

     文件        421  2015-02-07 23:56  AnticlockwiseDemo\bin\classes\com\example\anticlockwisedemo\R$menu.class

     文件        505  2015-02-07 23:56  AnticlockwiseDemo\bin\classes\com\example\anticlockwisedemo\R$string.class

     文件        464  2015-02-07 23:56  AnticlockwiseDemo\bin\classes\com\example\anticlockwisedemo\R$style.class

     文件        783  2015-02-07 23:56  AnticlockwiseDemo\bin\classes\com\example\anticlockwisedemo\R.class

     文件     691348  2015-02-08 00:02  AnticlockwiseDemo\bin\classes.dex

     文件     232610  2015-02-08 00:02  AnticlockwiseDemo\bin\dexedLibs\android-support-v4-dbbc07924b147169bb98bad51a761bab.jar

     文件       1606  2015-02-08 00:02  AnticlockwiseDemo\bin\res\crunch\drawable-hdpi\ic_launcher.png

     文件       1086  2015-02-08 00:02  AnticlockwiseDemo\bin\res\crunch\drawable-mdpi\ic_launcher.png

     文件       2010  2015-02-08 00:02  AnticlockwiseDemo\bin\res\crunch\drawable-xhdpi\ic_launcher.png

     文件       3002  2015-02-08 00:02  AnticlockwiseDemo\bin\res\crunch\drawable-xxhdpi\ic_launcher.png

     文件      12750  2015-02-08 00:04  AnticlockwiseDemo\bin\resources.ap_

     文件        171  2015-02-07 23:42  AnticlockwiseDemo\gen\com\example\anticlockwisedemo\BuildConfig.java

     文件       2829  2015-02-07 23:56  AnticlockwiseDemo\gen\com\example\anticlockwisedemo\R.java

     文件      23165  2015-02-07 23:42  AnticlockwiseDemo\ic_launcher-web.png

............此处省略58个文件信息