I am uploading my first APK file to google play but I am getting following error.
You uploaded an APK that is not zip aligned. You will need to run a
If you use Eclipse export wizard, it will automatically align it for you. However you can do it manually yourself
To align infile.apk and save it as outfile.apk:
zipalign [-f] [-v] infile.apk outfile.apk
This website can provide more answers :) http://developer.android.com/tools/help/zipalign.html