[SDK 35] expo-local-authentication error in Android build

Expo SDK
1

Hi all,

I’am getting the following error (logged in Sentry) while testing my Android (apk) build in the Android simulator.

Encountered an exception while calling native method: Exception occurred while executing exported method hasHardwareAsync on module ExpoLocalAuthentication: null

Using SDK 35 in managed workflow and "expo-local-authentication": "~7.0.0"

When running the app in development on the Android Emulator in the Expo Client there is no error occurring.

Someone able to help?

2

Just tested it again with a Fingerprint set up on the Android Simulator but the same error occurred.

3

Hi. Can you post the code?

4

Ow wow, how can I forget…

Importing it as:

import {
  AuthenticationType,
  hasHardwareAsync,
  isEnrolledAsync,
  supportedAuthenticationTypesAsync,
} from 'expo-local-authentication';

And using it with:

Promise.all([
    hasHardwareAsync(),
    isEnrolledAsync(),
    supportedAuthenticationTypesAsync(),
  ])
    .then(([isAvailable, isEnrolled, supportedTypes]) => ({
      isAvailable,
      isEnrolled,
      supportedTypes,
    }))
5

Nobody has an idea? I was not yet able to test it on a real Android device. Is it likely that it is only the simulator?

6

Can confirm now that it’s also crashing on Android builds on some real devices. Is this an Expo bug?

7

Was missing the “USE_FINGERPRINT” permission for Android. Adding that fixed the issue. Maybe it’s an idea to add it in the local-authentication documentation that this permission is required on Android. Because I completely missed it and the error isn’t clear that it’s a permission issue.

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8

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