书籍代码，很详细，你可以参照着代码认真学习，肯定会有很大的进步的，相信自己一切皆有可能-Book code, very detailed, you can refer to the code seriously study will certainly be great progress, and believe in yourself anything is possible

android，监测网络，用于版本升级管理，有简单的对话框和下载进度条-android, monitoring network for version upgrade management, there is a simple dialog box and the download progress bar

多种Android进度条显示样式，提供不同的风格供选择-android progress show