Select multiple item by drag block them

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.