To make post more complete.. Google embedded Crash report service in newer version of Android. For older versions, where that's not supported yet several services are available. among already mentioned I would recommend these two:
- ACRA (Crash reports - several options for reporting, chosen by developer or/and user)
- HockeyApp (Testing/Crash reports web platform with support library. Trial but paid version is worth of it if u r serious developer. support for iOS as well)
However.. Most of these libraries will make your app a bit "heavier", but more important thing is that internet permission is required for use of them. In case your app doesn't need internet for some other reason, it might be suspicious to the user why you need internet if no feature require it.
Final word: Try to use as much as possible service Google already provided for Android, over 3rd party libraries.
Cheers ;)