I am here with a trick
Actually this is a very very useful trick for them who change their google id from GOOGLE PLAY again and again.
So if you want to switch your google account in GOOGLE PLAY and if you do not want to RESET PHONE SETTINGS then you can follow this tip to add or change google account from GOOGLE PLAY.
1)Download ES FILE EXPLORER or ROOT EXPLORER from Store
2)then go to /data/system/ and Delete Accounts.db file
3)Restart your phone and Done.
Hope this helps you..
If you are having problems then contact me..