Implementing multiple gestures on gridView android

Question

I want to implement the following gestures on my grid view:

1. Drag items to rearrange them.
2. Allow multiple selection on items.
3. Perform some action when a single item is clicked.

For case one, I'm trying to use this library: https://github.com/askerov/DynamicGrid

However, when I'm using this dynamicGridView instead of the android provided GridView, this dynamic GridView is not allowing me to select multiple items.

Can someone please help me use this library, while allowing me to select multiple items as in Android's GridView.