Using a code library for Android with Apache 2.0 license

If:

1. I want to create an app (e.g. for a business who wants all its employees to download the app from Google Play freely)


2. I do not have an "about" button in the app.


3. The app is closed source.

How do I handle code libraries using Apache 2.0? I guess it is a "no-go"...

(But as I have yet to come up with a good way to make an about button when making solutions for customers - I want to make sure.)