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
Statistical analysis graph
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Origin http://10.200.1.11:23101/article/api/json?id=326802319&siteId=291194637
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