Apps How to slide up a context menu from bottom of screen.

[ductv]

Dear all,
I need help form experienced android developers to help me solve the problem below.
I have programmed to create a context menu. As the result, this context menu is displayed at the center of screen. However, the requirement is that the context menu is displayed by slide up from the bottom of the screen. I have tried to solve it, but the problem is still not resolved.
Please kindly help me.