android断点续传demo

一个实现断点续传的android小demo，帮助理解怎样断点续传下载实现

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

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

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2012-11-29 18:30  Download\
     文件         364  2012-11-28 17:08  Download\.classpath
     文件         844  2012-11-28 17:08  Download\.project
     文件         938  2012-11-28 17:25  Download\AndroidManifest.xml
     目录           0  2012-11-30 09:33  Download\assets\
     目录           0  2012-11-29 18:30  Download\bin\
     文件         938  2012-11-28 17:25  Download\bin\AndroidManifest.xml
     文件      163881  2012-11-29 18:19  Download\bin\Download.apk
     目录           0  2012-11-29 18:30  Download\bin\classes\
     目录           0  2012-11-29 18:30  Download\bin\classes\com\
     目录           0  2012-11-29 18:30  Download\bin\classes\com\example\
     目录           0  2012-11-29 18:30  Download\bin\classes\com\example\download\
     文件         349  2012-11-29 09:15  Download\bin\classes\com\example\download\BuildConfig.class
     文件        1229  2012-11-29 18:18  Download\bin\classes\com\example\download\DBHelper.class
     文件        3887  2012-11-29 09:15  Download\bin\classes\com\example\download\Dao.class
     文件        1933  2012-11-29 18:06  Download\bin\classes\com\example\download\DownloadInfo.class
     文件        3492  2012-11-29 18:26  Download\bin\classes\com\example\download\Downloader$MyThread.class
     文件        5087  2012-11-29 18:26  Download\bin\classes\com\example\download\Downloader.class
     文件        1461  2012-11-29 18:05  Download\bin\classes\com\example\download\LoadInfo.class
     文件        1883  2012-11-29 18:16  Download\bin\classes\com\example\download\MainActivity$1.class
     文件        4780  2012-11-29 18:16  Download\bin\classes\com\example\download\MainActivity.class
     文件         346  2012-11-29 17:42  Download\bin\classes\com\example\download\R$attr.class
     文件         481  2012-11-29 17:42  Download\bin\classes\com\example\download\R$dimen.class
     文件         453  2012-11-29 17:42  Download\bin\classes\com\example\download\R$drawable.class
     文件         532  2012-11-29 17:42  Download\bin\classes\com\example\download\R$id.class
     文件         442  2012-11-29 17:42  Download\bin\classes\com\example\download\R$layout.class
     文件         403  2012-11-29 17:42  Download\bin\classes\com\example\download\R$menu.class
     文件         519  2012-11-29 17:42  Download\bin\classes\com\example\download\R$string.class
     文件         401  2012-11-29 17:42  Download\bin\classes\com\example\download\R$style.class
     文件         693  2012-11-29 17:42  Download\bin\classes\com\example\download\R.class
     文件      338508  2012-11-29 18:19  Download\bin\classes.dex
............此处省略58个文件信息