I don't want to steal your glory, being your first app and all (I like to see more people learning Android development). But, I can't ignore this... I have an open source app, first released in 2011, that does very much the same thing plus a few other features, with support back to Android 1.6. Out of respect, I won't name it here, so anyone interested will need to search for it through my profile.
I hope your app does well, it might benefit both of ours with increased exposure for these kinds of apps. Feel free to check out the source code from my app to make yours better, and contribute back if you feel generous.