ok, so i have a clear fix for ppl who want to use google play on signed app, its a little glitch that work, easy :
1. you need to download injustice 2 from google play
2. start it, log in with your account
3. at settings, press that google activity to show you achievements
4. press that middle button form your phone to put your game in background, idk just go to start meniu, and dont close injustice
(this to work, dont close injustice)
5. you need to donwload from here signed and obb for injustice.
6. after you download them, move them close, so you can replace (obb in android/obb, and install injustice signed apk)
7. back to nr.4. after you put injustice in background then uninstall injustice
8. go instal signed injustice mod, then put obb from where did you save it in android/obb
9. start game normal, and it will log in
i need to mention that this glitch is working just one time, so you need to use mod for whatever you want to use it , after you close game it wont work anymore...
so if you need it again, you can do the same thing, its actually easy and fast.. anyway they fixed injustice crash buggs so you can run app without a stop for kinda 3 hours.. so its ok, the good thing is this work on NON ROOTED DEVICES soooo, thumbs up bois :)
have fun i searched and tried many nights for this thing so i tell you all so you can have fun :) fuck them, they made it so you cant use it on emulators. for me unsigned app is not working .. so im sad :(