from it ,you can learn
- swipeRefreshLayout
- recycleView
- StaggeredGridLayoutManager
- nineoldandroids: https://github.com/JakeWharton/NineOldAndroids
- photoview: https://github.com/chrisbanes/PhotoView
- android-async-http: https://github.com/loopj/android-async-http
- Android-Universal-Image-Loader: https://github.com/nostra13/Android-Universal-Image-Loader