http://blog.csdn.net/sun6223508/article/details/9290583 and
http://www.trinea.cn/android/android%E7%B3%BB%E7%BB%9F%E4%B8%8B%E8%BD%BD%E7%AE%A1%E7%90%86downloadmanager%E5%8A%9F%E8%83%BD%E4%BB%8B%E7%BB%8D%E5%8F%8A%E4%BD%BF%E7%94%A8%E7%A4%BA%E4%BE%8B 继续阅读“使用downloadmanager的代码，先放这。嘿嘿”