Map API Key doesn't works in Android app

Question

i've been working for a while in an Android app that uses a lot of the Maps API. And the thing is it works in the emulator with my debug key, but i see only a grid when i put "true" key, i tried with three already that i know they worked, so why could it be? I have internet permission (in the right place, befoce ) and i just can't find why this thing only works with the debug key.