remove or update Google play service on emulator

Question

i programmed an android app which uses the google maps api v2. i want to test it on the emulator, but to show the map it has a little bit problems. i googled and found the a

Answer 1

adb uninstall cannot work for system apps is what I am finding out. And Vending and gms are system apps. Therefore adb uninstall com.android.vending causes a failure even if I su. So is there no resolution to this problem?

I can't install it even if I use -r because the certificates are different.