Refer:

 

1. Go to the .
2. Select a project, or create a new one.
3. In the sidebar on the left, select APIs & auth. In the displayed list of APIs, make sure the Drive API status is set to ON.
4. In the sidebar on the left, select Registered apps.
5. At the top of the page, select Register App.
6. Type a name for the application and select Android.
7. Choose Accessing APIs directly from Android.
8. In the Package name field, enter your Android's app's (open  AndroidManifest.xml , see [package] ).
9. Copy the SHA1 fingerprint, which is highlighted in the example above.

Paste the SHA1 fingerprint into the certificate fingerprint field in the Cloud Console.

Click Register.