看了我的Nexus 4手机，每个Google 官方软件的风格都是一样的，都是从左侧滑动出来一个菜单，然后在设置项中发现都有一个 “开源软件许可” ，里面应该是用的哪些开源项目，看了一些，整理如下：
1.zxing library (二维码的开源库)
github: https://github.com/zxing/zxing
2.gson（GSON是Google开发的Java API,用于转换Java对象和Json对象。）
文档: https://sites.google.com/site/gson/gson-user-guide
github: https://github.com/google/gson
3.jmonkeyengine(图形引擎)
github: https://github.com/jMonkeyEngine/jmonkeyengine
4.proto-micro.jar (protocal buffer)
http://code.google.com/p/micro-protobuf/
https://www.ibm.com/developerworks/cn/linux/l-cn-gpb/
5.jsr305annotations
http://www.infoq.com/cn/news/2008/07/jsr-305-update
http://code.google.com/p/jsr-305/
6.opencv
7.Gifdecoder.java
8.google-api-client-1.7.0-beta.jar
http://mypyg.iteye.com/blog/1144965
9.guava (Google的开源框架)
http://code.google.com/p/guava-libraries/
http://macrochen.iteye.com/blog/737058
10.mime4j
http://www.open-open.com/open337346.htm
http://james.apache.org/mime4j/
11.keyczar(加密工具)
github: https://github.com/google/keyczar
12.okhttp(Http客户端)
官网: http://square.github.io/okhttp/
github: https://github.com/square/okhttp
13.ActionBarSherlock(ActionBar)
官网: http://actionbarsherlock.com/
github: https://github.com/JakeWharton/ActionBarSherlock
14.jChardet(自动编码识别)
官网: http://jchardet.sourceforge.net/
sourceforge: https://sourceforge.net/projects/jchardet/files/jchardet/
15.dd-plist(处理各种格式列表)
github: https://github.com/3breadt/dd-plist
16.DroidPlugin(插件机制:它可以在无需安装、修改的情况下运行APK文件,此机制对改进大型APP的架构)
github: https://github.com/DroidPluginTeam/DroidPlugin
17.JSR-305(代码、注释检查)
github: https://github.com/CyanogenMod/android_external_jsr305
18.android-multitouch-controller(多点触控)
github: https://github.com/lukehutch/android-multitouch-controller
19.Libphonenumber(解析,格式化,存储和验证国际电话号码)(Java、C++、JavaScript)
github: https://github.com/googlei18n/libphonenumber
20.Apache Commons IO(很多工具类)
github: https://github.com/apache/commons-io
21.Apache Commons Lang(很多工具类)
github: https://github.com/apache/commons-lang
22.muPDF(PDF 阅读器)
github: https://github.com/joniks/Android-MuPDF
23.ViewPagerIndicator(Tab)
github: https://github.com/JakeWharton/ViewPagerIndicator
24.Material design icons(Material design图标)
官网: https://design.google.com/icons/
github: https://github.com/google/material-design-icons
25.glide(图片加载和缓存库)
github: https://github.com/bumptech/glide
26.stetho(Facebook出品的一个强大的Android调试工具)
官网: http://facebook.github.io/stetho/
github: https://github.com/facebook/stetho
27.CreditCardEntry(信用卡验证)
github: https://github.com/dbachelder/CreditCardEntry
28.AndroidAsync(异步UI更新)