How are unique registration id's for GCM for each device generated?

Question

I have to test my app for GCM multicast on emulators around 10 or more in number. For this I need to create 10 emulators that can provide me unique registration ids.

I tried cloning a single emulator with a google account and loading the userdata-qemu.img into new emulator. In this case the registration ids returned by the new emulator is same as the old one.

I tested the app on two separately created emulators with the same google account in which case they return different registration ids. Certainly GCM does not use account information for that.

I understand that registration id for GCM is generated from the " app package and device ". How does Google uniquely identify a device or emulator instance.

Also tried changing the uuid of the emulator provided in the emulator-user.ini file but of no use.

Certainly I can go about doing this manually , but it would be too cumbersome each time.

Any help would be appreciated.

Thanks

Answer 1

ID生成的确切算法是实现细节-尚未公开，Google可以随时更改它，并且依靠它是不明智的。