chore: added support for enabling biometrics even after initializing …

…secure credentials manager

auth0/src/main/java/com/auth0/android/authentication/storage/SecureCredentialsManager.kt

@@ -31,8 +31,8 @@ public class SecureCredentialsManager @VisibleForTesting(otherwise = VisibleForT
     private val crypto: CryptoUtil,
     jwtDecoder: JWTDecoder,
     private val serialExecutor: Executor,
-    private val fragmentActivity: WeakReference<FragmentActivity>? = null,
-    private val localAuthenticationOptions: LocalAuthenticationOptions? = null,
+    private var fragmentActivity: WeakReference<FragmentActivity>? = null,
+    private var localAuthenticationOptions: LocalAuthenticationOptions? = null,
     private val localAuthenticationManagerFactory: LocalAuthenticationManagerFactory? = null,
 ) : BaseCredentialsManager(apiClient, storage, jwtDecoder) {
     private val gson: Gson = GsonProvider.gson
@@ -59,7 +59,7 @@ public class SecureCredentialsManager @VisibleForTesting(otherwise = VisibleForT
 
 
     /**
-     * Creates a new SecureCredentialsManager to handle Credentials with Authentication
+     * Creates a new SecureCredentialsManager to handle Credentials with biometrics Authentication
      *
      * @param context   a valid context
      * @param apiClient the Auth0 Authentication API Client to handle token refreshment when needed.
@@ -84,6 +84,11 @@ public class SecureCredentialsManager @VisibleForTesting(otherwise = VisibleForT
         DefaultLocalAuthenticationManagerFactory()
     )
 
+    public fun enableBiometrics(fragmentActivity: FragmentActivity, localAuthenticationOptions: LocalAuthenticationOptions) {
+        this.fragmentActivity = WeakReference(fragmentActivity)
+        this.localAuthenticationOptions = localAuthenticationOptions
+    }
+
     /**
      * Saves the given credentials in the Storage.
      *