# fingerprint_reconization

A simple Flutter plugin to handle fingerprint (biometric) authentication using Android's `BiometricPrompt` API.

## Features

✅ Authenticate users using fingerprint  
✅ Fully native Android implementation  
✅ Easy to use from Dart  
✅ BiometricPrompt-based, supports modern devices

---

## 🔧 Installation

Add the plugin to your `pubspec.yaml`:

```yaml
dependencies:
  fingerprint_reconization:
    git:
    ...
    fingerprint_reconization # or from pub.dev
    ...

---

✍️ Android Configuration

1. Update your example/android/app/src/main/java/.../MainActivity.java

Replace:

import io.flutter.embedding.android.FlutterActivity;

public class MainActivity extends FlutterActivity {}

With:

import io.flutter.embedding.android.FlutterFragmentActivity;

public class MainActivity extends FlutterFragmentActivity {}

This change is necessary because BiometricPrompt requires a FragmentActivity.

---

---

2. Add permissions in AndroidManifest.xml (usually not required, but good practice)

In android/app/src/main/AndroidManifest.xml:

<uses-permission android:name="android.permission.USE_BIOMETRIC" />
<uses-permission android:name="android.permission.USE_FINGERPRINT" />

---

3. Use Java 11+

In android/build.gradle:

---

3. insuer to use minNdkVersion =27.xxxxxxxxxx

📱 Usage

Dart code (example):

import 'package:flutter/material.dart';
import 'package:fingerprint_reconization/fingerprint_reconization.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  final _plugin = FingerprintReconization();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Fingerprint Auth')),
        body: Center(
          child: ElevatedButton(
            onPressed: () async {
              try {
                final result = await _plugin.authenticate();
                if (result == 'AUTH_SUCCESS') {
                  print("Authentication succeeded!");
                } else {
                  print("Authentication failed: $result");
                }
              } catch (e) {
                print("Error: $e");
              }
            },
            child: Text("Authenticate"),
          ),
        ),
      ),
    );
  }
}

---

🧪 Methods

Method	Description
authenticate()	Prompts user for fingerprint.

---

❗ Important Notes

• Only works on Android API 23+ (Android 6.0+).
• You must use FlutterFragmentActivity instead of FlutterActivity.
• If you see errors related to FragmentActivity, check your imports and class inheritance in MainActivity.

---

📄 License

MIT License.

MIT License

Copyright (c) 2025 Maxym Tene alias Elmaxproart

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights  
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell     
copies of the Software, and to permit persons to whom the Software is         
furnished to do so, subject to the following conditions:                      

The above copyright notice and this permission notice shall be included in    
all copies or substantial portions of the Software.                           

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR    
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,      
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE   
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER        
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN     
THE SOFTWARE.