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.

See some case studies of successful Smart Lock for Passwords integrations.

// Store user credentials with Auth.CredentialsApi.save()

Auth.CredentialsApi.save(mCredentialsClient, credential).setResultCallback(
    new ResultCallback() {
        @Override
        public void onResult(Status status) {
            if (status.isSuccess()) {
                // Credentials were saved
            } else {
                if (status.hasResolution()) {
                    // Try to resolve the save request. This will prompt the user if
                    // the credential is new.
                    try {
                        status.startResolutionForResult(this, RC_SAVE);
                    } catch (IntentSender.SendIntentException e) {
                        // Could not resolve the request
                    }
                }
            }
        }
    });
// Retrieve stored credentials with Auth.CredentialsApi.request()

Auth.CredentialsApi.request(mCredentialsClient, mCredentialRequest).setResultCallback(
    new ResultCallback() {
        @Override
        public void onResult(CredentialRequestResult credentialRequestResult) {
            if (credentialRequestResult.getStatus().isSuccess()) {
                // Handle successful credential requests
            } else {
                // Handle unsuccessful and incomplete credential requests
            }
        }
    });
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