If your facing below exception when you’re trying to hit Google map.
I/Google
Maps Android API(2470): Failed to contact Google servers. Another attempt will
be made when connectivity is established.
E/Google Maps Android API(2470):
Failed to load map. Error contacting Google servers. This is probably an
authentication issue (but could be due to network errors).
Check whether you have followed Google maps documentation,
If you feel, everything is achieved but still map is not appearing and you're getting above exception then we should check the below mentioned solution.
Solution / Checks:
When you’re facing authentication issue with your
application then check two things.
1. Whether
you’re behind the proxy.
2. Whether
you’re debug.keystore file is signed or not.
If you’re using default
android debug.keystore then it is not signed.