统计分析图

https://android-arsenal.com/tag/40
http://blog.csdn.net/lk_blog/article/details/7645668

spark
https://android-arsenal.com/details/1/3446
https://github.com/robinhoodmarkets/spark

progress bar stack:
https://github.com/GIGAMOLE/ArcProgressStackView
https://android-arsenal.com/details/1/2329
https://android-arsenal.com/details/1/3308