NoobSolver

override fun onResume() {
   super.onResume()

   if (ciphertextWrapper != null) {
       if (SampleAppUser.fakeToken == null) {
           showBiometricPromptForDecryption()
       } else {
           // The user has already logged in, so proceed to the rest of the app
           // this is a todo for you, the developer
           updateApp(getString(R.string.already_signedin))

NoobSolver

binding.useBiometrics.setOnClickListener {
   showBiometricPromptForEncryption()
}
....

private fun showBiometricPromptForEncryption() {
   val canAuthenticate = BiometricManager.from(applicationContext).canAuthenticate()
   if (canAuthenticate == BiometricManager.BIOMETRIC_SUCCESS) {
       val secretKeyName = SECRET_KEY_NAME
       cryptographyManager = CryptographyManager()

NoobSolver

if (ciphertextWrapper != null) {
   // user has already enabled biometrics
} else {
   // biometrics has not been enabled
}

NoobSolver

void main() {
  var i = 20;
  print('fibonacci($i) = ${fibonacci(i)}');
}
int fibonacci(int n) {
  return n < 2 ? n : (fibonacci(n - 1) + fibonacci(n - 2));
}