How can i implement face authentication using biometric prompt in android x?

Question

But can i implement face authentication using biometric prompt or any other android api's in my app. If no, are there any sdk which I can use to implement this feature in my app??

Answer 1

You can use the BiometricPrompt class to create a prompt dialog that just uses any biometric credential the user has initialized (e.g. fingerprint but also face). You can create a authentication dialog with the following steps:

Step 1: Add dependencies to your build.gradle file in app/

dependencies {
    implementation 'androidx.biometric:biometric:1.0.1'
}

Step 2: display the authentication prompt

private Executor executor;
private BiometricPrompt biometricPrompt;
private BiometricPrompt.PromptInfo promptInfo;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);
    executor = ContextCompat.getMainExecutor(this);
    biometricPrompt = new BiometricPrompt(MainActivity.this,
            executor, new BiometricPrompt.AuthenticationCallback() {
            
        @Override
        public void onAuthenticationSucceeded(
                @NonNull BiometricPrompt.AuthenticationResult result) {
            super.onAuthenticationSucceeded(result);
            // authenticated
        }

        @Override
        public void onAuthenticationFailed() {
            super.onAuthenticationFailed();
            // authentication failed
        }
    });

    promptInfo = new BiometricPrompt.PromptInfo.Builder()
            .setTitle("Biometric Authentication")
            .setSubtitle("Log in with your biometric credentials")
            .build();
}

The dialog will be displayed by calling this method:

biometricPrompt.authenticate(promptInfo);

Check the android doc for further information.