Yes, it is indeed possible to implement biometric authentication features in a Flutter app. Flutter offers excellent support for biometric authentication through the local_auth package. By integrating this package into your Flutter app, you can provide a secure and convenient authentication experience to your users using their unique biometric data, such as fingerprints or face recognition.
Here’s a step-by-step guide to implementing biometric authentication in your Flutter app:
- Add the local_auth package to your pubspec.yaml file: Open your pubspec.yaml file and add the following dependency:
dependencies:
local_auth: ^1.1.6
- Import the local_auth package: Import the local_auth package in your Dart file:
import 'package:local_auth/local_auth.dart';
- Check biometric availability: Use the local_auth package to check if the device supports biometric authentication:
LocalAuthentication localAuth = LocalAuthentication();
bool biometricsAvailable = await localAuth.canCheckBiometrics;
This code snippet uses the canCheckBiometrics method to determine whether the device supports biometric authentication or not.
- List available biometrics: Retrieve a list of available biometrics on the device:
List availableBiometrics = await localAuth.getAvailableBiometrics;
The getAvailableBiometrics method returns a list of biometric types supported by the device, such as fingerprint or face recognition. You can use this list to determine which biometric methods are available.
- Authenticate using biometrics: Implement the biometric authentication process to authenticate the user:
bool authenticated = await localAuth.authenticate(
localizedReason: 'Authenticate to access the app',
biometricOnly: true, // Set this to false if you want to include other authentication methods
);
if (authenticated) {
// User authenticated
} else {
// Authentication failed
}
The authenticate method triggers the biometric authentication prompt on the device, prompting the user to authenticate using their registered biometric data. The localizedReason parameter allows you to provide a custom message explaining why authentication is required. Set biometricOnly to true if you want to restrict authentication to biometrics only.
This is a basic example of implementing biometric authentication in a Flutter app. You can further enhance the authentication process by handling error cases, implementing fallback options, and customizing the UI based on the available biometrics.
It’s worth mentioning that not all devices support biometric authentication, so it’s essential to check for biometric availability before attempting authentication. Additionally, ensure that you handle authentication failures gracefully and provide appropriate feedback to the user.
