Thanks for the advice.
The app is not brand new. I've done it more than one year ago. Anyway I regularly update it every week.
I personally don't like very much modern look (spinners, checkboxes, edittext, etc.).
The scrollview should scroll more than the ads size, allowing to display all the list.
At first YouTube was working like you say and there was a Vevo button too, to directly display Vevo videos but, with latest Vevo interface upgrades, I noticed problems loading videos with low memory devices. So I decided to use only the YouTube search, this way you can find and play Vevo videos too.
I agree that I should expand fonts ans buttons for wider devices.