I recently had a problem with an Android emulator, and for some reason I wasn't able to delete the Android app I was developing. I knew you could delete Android apps from the command line, but I had no need to do this until now.
After reading a few docs, I found I could delete my Android app from the command line using the adb command, like this:
./adb uninstall com.devdaily.fptracker
I think the only important things are: