In the developer console, go to the API Manager
First, you will need some API keys.
- Go to credentials.
- Select Create Credentials and select API Key and Android Key.
- On the next screen, enter any name for your credentials.
- In the imprint of the package name + Add, write the name of the package (com.sourcey.materialwh independently) and the imprint that appears in your journal (E4: ...: B9).

Now from the API Manager go to Overview
- Find the "Google Maps Android API" and enable it.

Perhaps you received a debug keystore when installing the Android SDK, with it you can check your fingerprint using the command: ($ HOME / .android / debug.keystore is the default location)
keytool -list -v -keystore .android/debug.keystore
http://developer.android.com/intl/es/tools/publishing/app-signing.html
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