问题
First, let me tell u that i am stressed out by this, because i don't even know the concept / method name, so i can't even search it in google as i don't know the keywords, but ill try my best to explain it. Feel free to modify my contents and title as you see fit.
what i want to achieve is this: i have view group contains many child views, or it can be GridView i want to able to block select some of it child views, and return the selected / blocked items.
pictures worth more than thousands words:
any help is appreciated, thank you very much.
来源：https://stackoverflow.com/questions/30449455/select-multiple-item-by-drag-block-them