Google SignIn with FireBase in Android

1. Make a empty project  api level 22 or above.

2. now go tools>Firebase>Authantication>setup Cloud messaging
connect to firebase
add fcm to your project

3.add project level gradle dependency-
classpath 'com.google.gms:google-services:4.0.1'

 3.now in activity_main.xml make google signin button and make layout like
my layout-

 4.make sure lines present in app level depenency-


 5.MainActivity.java code is below-


 6. Add a new java class BaseActivity-

 7. now every thing is setup u can try and run