框架不错，提个建议，参考MPChart，可以把父类的所有变量和方法都设置成public，不然框架的自定义很受限，只能down你源码下来修改

如题，比如设置自己的ItemViewProvider，provideMonthView方法竟然一定要返回你源码的MonthView，这个类里面的所有成员变量都是private，想自定义一下view都不行，改成个接口就好了

Start with ItemViewProvider and its provideMonthView method, then inspect MonthView's private members and the parent APIs involved. Confirm which members must be exposed or replaced by an interface so a custom view can be supplied without modifying downloaded source; done means consumers can customize the view through the public API.

Written by the indexing model from the issue text.