H-Reader, a document reader for Android: official mockup

Here it is, my creation (er... just the mockup for now...): H-Reader.
This idea was born because I found no valid .pdf and .epub reader for Android.
Some time ago I told you that I was going to study Java, and that's why I need it.
The idea is a simple, Holo-light themed application with basic functions, nothing much but a useful and well made application.
I hope I will do this: it would be a really important achievement for me.
Hope you like!