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Smart Lock API in Android

Smart lock API
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.OnConnectionFailedListener 
In your activity add the following lines to initialize GoogleApiClient
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.enableAutoManage(this, 0, this)
.addApi(Auth.CREDENTIALS_API)
.build();
Save Credentials:

You can save your username and password credentials by passing as in the following:
String username = mUsernameTextInputLayout.getEditText().getText().toString();
String password = mPasswordTextInputLayout.getEditText().getText().toString();
Credential credential = new Credential.Builder(username)
                        .setPassword(password)
                        .build();
Pass your credentials to Save method
protected void saveCredential(Credential credential) {
        // Credential is valid so save it.
        Auth.CredentialsApi.save(mGoogleApiClient,
                credential).setResultCallback(new ResultCallback() {
            @Override
            public void onResult(Status status) {
                if (status.isSuccess()) {
                    Log.d(TAG, "Credential saved");
                    goToContent();
                } else {
                    Log.d(TAG, "Attempt to save credential failed " +
                            status.getStatusMessage() + " " +
                            status.getStatusCode());
                    resolveResult(status, RC_SAVE);
                }
            }
        });
    }
Following Method is used to process the status of saving your credentials
private void resolveResult(Status status, int requestCode) {
 // We don't want to fire multiple resolutions at once since that
 // can   result in stacked dialogs after rotation or another
 // similar event.
 if (mIsResolving) {
  Log.w(TAG, "resolveResult: already resolving.");
  return;
 }

 Log.d(TAG, "Resolving: " + status);
 if (status.hasResolution()) {
  Log.d(TAG, "STATUS: RESOLVING");
  try {
   status.startResolutionForResult(this, requestCode);
   mIsResolving = true;
  } catch (IntentSender.SendIntentException e) {
   Log.e(TAG, "STATUS: Failed to send resolution.", e);
  }
 } else {
  Log.e(TAG, "STATUS: FAIL");
  if (requestCode == RC_SAVE) {
   goToContent();
  }
 }
}
OnActivityResult shows in the output of saving your credentials
public void onActivityResult(int requestCode, int resultCode, Intent data) {
 super.onActivityResult(requestCode, resultCode, data);
 Log.d(TAG, "onActivityResult:" + requestCode + ":" + resultCode + ":" + data);
 if (requestCode == RC_SAVE) {
  Log.d(TAG, "Result code: " + resultCode);
  if (resultCode == RESULT_OK) {
   Log.d(TAG, "Credential Save: OK");
  } else {
   Log.e(TAG, "Credential Save Failed");
  }
  goToContent();
 }
 if (requestCode == RC_READ) {
  if (resultCode == RESULT_OK) {
   Credential credential = data.getParcelableExtra(Credential.EXTRA_KEY);
   processRetrievedCredential(credential);
  } else {
   Log.e(TAG, "Credential Read: NOT OK");
  }
 }
}
/**
 * Start the Content Activity and finish this one.
 */
protected void goToContent() {
 startActivity(new Intent(this, ContentActivity.class));
 finish();

}
Retrieve Credentials:

Retrieve your saved credentials from your account and made your login process easier
private void requestCredentials() {
Log.d(TAG, "requestCredentials");
CredentialRequest request = new CredentialRequest.Builder()
  .setPasswordLoginSupported(true)
  .build();

Auth.CredentialsApi.request(mGoogleApiClient, request).setResultCallback(
 new ResultCallback() {
 @Override
 public void onResult(@NonNull CredentialRequestResult credentialRequestResult) {
  Status status = credentialRequestResult.getStatus();
  Log.v(TAG, status.getStatus().toString());
  if (credentialRequestResult.getStatus().isSuccess()) {
   Credential credential = credentialRequestResult.getCredential();
   processRetrievedCredential(credential);
  } else if (status.getStatusCode() == CommonStatusCodes.SIGN_IN_REQUIRED) {
   Log.d(TAG, "Sign in required");
  } else if (status.getStatusCode() == CommonStatusCodes.RESOLUTION_REQUIRED) {
   Log.w(TAG, "Unrecognized status code: " + status.getStatusCode());
   try {
    status.startResolutionForResult(MainActivity.this, RC_READ);
   } catch (IntentSender.SendIntentException e) {
    Log.e(TAG, "STATUS: Failed to send resolution.", e);
   }
  }
 }
    });
}
Download Code:

You can download the full source from the following Github link. If you Like this tutorial, Please star it in Github.
    
Download From Github

Post your doubts and comments in the comments section.