Today when i wanted to play with Google Maps, i had to generate a new Certificate fingerprint to include Maps. To generate a new Certificate fingerprint you need to use the keytool that comes with the SDK,
so i executed this line in the CMD,
keytool -list -keystore .android/debug.keystore
but it's asking for a password, duh! after few seacrches on google, I found out, it's android, type android and you shall passed