Android is not an easy platform to develop for.
Screens are of all sizes and resolutions.
Devices range from poop-to god mode.
Android has no baseline.
I suggest picking a few common devices. Tablet, phone.
Galaxy s3 would be a good average.
Nvidia's shield tablet would mark the new high end capabilities.
Luckily, as an android developer you can actually restrict people from playing if they dont have a device you want to develop for.