On the Nexus 7 it is not a true crash as there is no option to report. Having tried to load it several times this morning I've managed to see/read a very quick toastmessage stating that my trial period has expired! Sometimes it's so fast that the message doesn't show at all.
With regard to my comment about it lagging. I mean that if a song is playing and I select any of the menus, but in particular the equaliser menu. There is a very large delay and the app feels unresponsive.
The file type that won't play is .wma but the factory installed player manages to play them.
Exclude folders option... I see this now. Nice addition, on my S3 the tab is not present due to the width of the screen. I did not realise that the tabs also scrolled and no video to guide me yet
With regard to the next item, menu opening. Yes it was the credits page that opened but I can't recreate it so it's probably best to diehard that comment.
I understand the reason for the wireless but as this is your showcase app in which you hope the user will then go on to purchase the full version I would certainly consider using a messagebox to inform the user that wireless has to be switched on and also a messagebox stating when the trial has expired.
Whilst testing this morning I've had two other system error messages that occurred after the device had turned off the screen. First was an array index out of bounds. Second was a bitmap not initialised both caused app to close but still no option to report the fault. Sorry.
Please excuse any typos, I'm using my tablet and in a rush as I now have to leave for work