Design Pattern(Android) - Class Diagram - One Finger Pinch Zoom

I added zooming instruction for Design Pattern App. The instruction will be on class diagram page(top navigation bar).

User can use one finger pinch to zoom in/out a class diagram.

I am providing a screen print.

I got few feedback from users regarding zooming issue. Now I put zooming instruction for all three version of Design pattern App. I updated app code with some layout changes.

Design Pattern Tablet

Design Pattern Pro

Design Pattern