I already released my app on play store, Now i am going to add google map into that app.
So for that i created app key for Google map Api. I placed it into " app/src/debug/res/values/google_maps_api.xml " file & AndroidManifest.xml .
While testing on emulator and mobile device app showns google map but after signed apk generated and that signed apk didn't show map.
Plz give me step by step process (i checked other ans but didn't helped me ):