Some minor improvements

[ayltai]

I am using your library and I found something not working perfectly for me so I made some improvements.

The most annoying thing is that if I pull down the list so that it is in DROPPING state, but my finger is still touching the screen and moving, the state will keep transitioning between EXPANDING and DROPPING.

• Enhancement: Support RecyclerView as ListView is deprecated
• Fix: @IdRes should be @ColorRes in some places
• Fix: Weird behavior when event state is DROPPING and touch state is moving