Create a 3x3 Matrix like Android's Lock Screen Pattern View

have you ever put a lock pattern in your android device?

Well i want to make a 9 point 3x3 matrix where i can draw different patterns, its a kinda game app, i will show a figure and the user will use the 3x3 matrix to draw that pattern, like we do when we unlock our phone, so i was wondering how can I do that, there is a library with this or there is a android native class to do this, or how?

I will really help me if you help guys. Thanks.