By integrating Smart Lock for Passwords into your Android app, you can automatically sign users in to your app using the credentials they have saved. Users can save both username-password credentials and federated identity provider credentials. Integrate Smart Lock for Passwords into your app by using the Credentials API to retrieve saved credentials on sign-in. Use successfully retrieved credentials to sign the user in, or use the Credentials API to rapidly on-board new users by partially completing your app's sign in or sign up form. Prompt users after sign-in or sign-up to store their credentials for future automatic authentication. Reference : Official Link Project Setup Smart Lock for Passwords on Android requires the following: Add the following line in app level gradle file compile 'com.google.android.gms:play-services-auth:10.0.1' Then Click Sync Now Coding Part Create your activity with implements of GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConne...