Android - LocalAuth Plugin getEnrolledBiometrics throws when no Activity is available #174191
Description
What package does this bug report belong to?
local_auth
What target platforms are you seeing this bug on?
Android
Have you already upgraded your packages?
Yes
Dependency versions
pubspec.lock
local_auth:
dependency: transitive
description:
name: local_auth
sha256: "434d854cf478f17f12ab29a76a02b3067f86a63a6d6c4eb8fbfdcfe4879c1b7b"
url: "https://pub.dev"
source: hosted
version: "2.3.0"
local_auth_android:
dependency: transitive
description:
name: local_auth_android
sha256: "316503f6772dea9c0c038bb7aac4f68ab00112d707d258c770f7fc3c250a2d88"
url: "https://pub.dev"
source: hosted
version: "1.0.51"
local_auth_darwin:
dependency: transitive
description:
name: local_auth_darwin
sha256: "0e9706a8543a4a2eee60346294d6a633dd7c3ee60fae6b752570457c4ff32055"
url: "https://pub.dev"
source: hosted
version: "1.6.0"
local_auth_platform_interface:
dependency: transitive
description:
name: local_auth_platform_interface
sha256: "1b842ff177a7068442eae093b64abe3592f816afd2a533c0ebcdbe40f9d2075a"
url: "https://pub.dev"
source: hosted
version: "1.0.10"
local_auth_windows:
dependency: transitive
description:
name: local_auth_windows
sha256: bc4e66a29b0fdf751aafbec923b5bed7ad6ed3614875d8151afe2578520b2ab5
url: "https://pub.dev"
source: hosted
version: "1.0.11"
Steps to reproduce
- Start a headless flutter engine
- Call
getEnrolledBiometrics - Throws Nullpointer when accessing Activity
Expected results
Returns some error code so that we can handle the error in case it's a headless flutter engine
Actual results
PlatformException: PlatformException(java.lang.NullPointerException: Attempt to invoke virtual method 'int androidx.biometric.BiometricManager.canAuthenticate(int)' on a null object reference, NullPointerException, Cause: null, Stacktrace: java.lang.NullPointerException: Attempt to invoke virtual method 'int androidx.biometric.BiometricManager.canAuthenticate(int)' on a null object reference
at io.flutter.plugins.localauth.LocalAuthPlugin.getEnrolledBiometrics(LocalAuthPlugin.java:86)
at io.flutter.plugins.localauth.Messages$LocalAuthApi.lambda$setUp$3(Messages.java:770)
at io.flutter.plugins.localauth.Messages$LocalAuthApi$$ExternalSyntheticLambda3.onMessage(D8$$SyntheticClass:0)
at io.flutter.plugin.common.BasicMessageChannel$IncomingMessageHandler.onMessage(BasicMessageChannel.java:261)
at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:292)
at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:319)
at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(D8$$SyntheticClass:0)
Code sample
Code sample
void main() async {
WidgetsFlutterBinding.ensureInitialized();
final auth = LocalAuthentication();
try {
final biometrics = await auth.getAvailableBiometrics();
print("Found $biometrics");
} catch (e) {
print("Error $e"); //never called, the app is terminated and crashes
}
}Screenshots or Videos
No response
Logs
Logs
[Paste your logs here]Flutter Doctor output
Doctor output
~ > fvm flutter doctor -v
┌─────────────────────────────────────────────────────────┐
│ A new version of Flutter is available! │
│ │
│ To update to the latest version, run "flutter upgrade". │
└─────────────────────────────────────────────────────────┘
[✓] Flutter (Channel stable, 3.29.3, on macOS 15.6 24G84 darwin-arm64, locale en-US) [2.8s]
• Flutter version 3.29.3 on channel stable at /Users/julianbissekkou/fvm/versions/3.29.3
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision ea121f8859 (4 months ago), 2025-04-11 19:10:07 +0000
• Engine revision cf56914b32
• Dart version 3.7.2
• DevTools version 2.42.3
[!] Android toolchain - develop for Android devices (Android SDK version 35.0.0) [3.5s]
• Android SDK at /Users/julianbissekkou/Library/Android/sdk
• Platform android-36, build-tools 35.0.0
• Java binary at: /Users/julianbissekkou/Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
This is the JDK bundled with the latest Android Studio installation on this machine.
To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
• Java version OpenJDK Runtime Environment (build 21.0.6+-13368085-b895.109)
! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses
[✓] Xcode - develop for iOS and macOS (Xcode 16.3) [2.3s]
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 16E140
• CocoaPods version 1.16.2
[✓] Chrome - develop for the web [114ms]
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 2024.3) [113ms]
• Android Studio at /Users/julianbissekkou/Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 21.0.6+-13368085-b895.109)
[✓] IntelliJ IDEA Community Edition (version 2025.1.4.1) [111ms]
• IntelliJ at /Users/julianbissekkou/Applications/IntelliJ IDEA Community Edition.app
• Flutter plugin version 86.0.2
• Dart plugin version 251.27812.12
[✓] Network resources [1,219ms]
• All expected network resources are available.
! Doctor found issues in 1 category.