Android 日期时间倒计时

根据用户输入的时间和日期，对比当前时间进行倒计时。代码有注释，简单易懂，适合新手学习。

/** Automatically generated file. DO NOT MODIFY */
package com.ycf.blog_01_time;

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

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2014-02-24 10:19  Blog_01_Time\
     文件         475  2014-02-24 10:19  Blog_01_Time\.classpath
     文件         848  2014-02-24 10:19  Blog_01_Time\.project
     目录           0  2014-02-24 10:19  Blog_01_Time\.settings\
     文件         177  2014-02-24 10:19  Blog_01_Time\.settings\org.eclipse.jdt.core.prefs
     文件         883  2014-02-24 10:19  Blog_01_Time\AndroidManifest.xml
     目录           0  2014-02-24 10:19  Blog_01_Time\assets\
     目录           0  2014-02-24 10:19  Blog_01_Time\bin\
     文件         883  2014-02-24 10:19  Blog_01_Time\bin\AndroidManifest.xml
     文件      260276  2014-02-24 10:19  Blog_01_Time\bin\Blog_01_Time.apk
     目录           0  2014-02-24 10:19  Blog_01_Time\bin\classes\
     目录           0  2014-02-24 10:19  Blog_01_Time\bin\classes\com\
     目录           0  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\
     目录           0  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\blog_01_time\
     文件         349  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\blog_01_time\BuildConfig.class
     文件        1498  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\blog_01_time\MainActivity$1.class
     文件        1450  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\blog_01_time\MainActivity$2.class
     文件        1090  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\blog_01_time\MainActivity$TimeCount$1.class
     文件        1040  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\blog_01_time\MainActivity$TimeCount$2.class
     文件        1408  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\blog_01_time\MainActivity$TimeCount.class
     文件        5879  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\blog_01_time\MainActivity.class
     文件         346  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\blog_01_time\R$attr.class
     文件         467  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\blog_01_time\R$dimen.class
     文件         413  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\blog_01_time\R$drawable.class
     文件         609  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\blog_01_time\R$id.class
     文件         409  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\blog_01_time\R$layout.class
     文件         394  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\blog_01_time\R$menu.class
     文件         478  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\blog_01_time\R$string.class
     文件         437  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\blog_01_time\R$style.class
     文件         693  2014-02-24 10:19  Blog_01_Time\bin\classes\com\ycf\blog_01_time\R.class
     文件      819752  2014-02-24 10:19  Blog_01_Time\bin\classes.dex
............此处省略57个文件信息