2 days ago I published my app but It doesn't work .
It doesn't load map with Google Maps API (Last version), I can see only white screen with google written in left-bottom position, and doesn't load Google Places API Research bar. 

I've tried xomena advice but it doesn't work. LogCat say me :

> 
> 03-29 09:22:39.807 8728-8815/? E/Google Maps Android API: Authorization failure. Please see <https://developers.google.com/maps/documentation/android-api/start> for how to correctly set up the map. 03-29 09:22:39.812 8728-8815/? E/Google Maps Android API: In the Google Developer Console (<https://console.developers.google.com>) Ensure that the "Google Maps Android API v2" is enabled. Ensure that the following Android Key exists: API Key: YOUR\_KEY\_HERE Android Application (;): Here SHA1 fingerprint from Play Store
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Google Maps Android API v2 are enable, The fingerprint is correct and the key exists . I've tried to copy the Fingerprint in LogCat too but nothing.

I solved it .
For other with the same problem, I've forgotten to modify key value on projectname/app/src/release/res/values .