flutter_liveness_detection 1.0.1

flutter_liveness_detection: ^1.0.1 copied to clipboard

example/lib/main.dart

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_liveness_detection/flutter_liveness_detection.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:camera/camera.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await requestCameraPermission();
  runApp(const MyApp());
}

Future<void> requestCameraPermission() async {
  final status = await Permission.camera.request();
  if (!status.isGranted) {
    runApp(const PermissionDeniedApp());
  }
}

class PermissionDeniedApp extends StatelessWidget {
  const PermissionDeniedApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(title: const Text("Permission Denied")),
        body: Center(
          child: AlertDialog(
            title: const Text("Permission Denied"),
            content: const Text("Camera access is required for verification."),
            actions: [
              TextButton(
                onPressed: () => SystemNavigator.pop(),
                child: const Text("OK"),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Material App',
      home: HomePage(),
    );
  }
}

class HomePage extends StatefulWidget {
  const HomePage({super.key});

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  final FlutterLivenessDetection _livenessDetection =
      FlutterLivenessDetection();
  File? imageFile;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      appBar: AppBar(
        backgroundColor: Colors.blueAccent,
        toolbarHeight: 70,
        centerTitle: true,
        title: const Text('Identify'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Text(
              'Please click the button below to start verification',
              textAlign: TextAlign.center,
              style: TextStyle(fontSize: 20),
            ),
            const SizedBox(height: 30),
            (imageFile != null)
                ? SizedBox(
                  height: 200,
                  width: 150,
                  child: Image.file(imageFile!),
                )
                : const SizedBox(),
            ElevatedButton(
              style: ElevatedButton.styleFrom(
                padding: const EdgeInsets.all(20),
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(15),
                ),
                foregroundColor: Colors.black,
                backgroundColor: Colors.blueAccent,
              ),
              onPressed: () async {
                final List<CameraDescription> cameras =
                    await availableCameras();

                if (cameras.isNotEmpty) {
                  List<Expression> expressions = [
                    Expression.smile, // Ask user to smile
                    Expression.eyeblink, // Ask user to blink
                    // Expression.leftPose,  // Turn head left
                    // Expression.rightPose, // Turn head right
                  ];
                  // Ignore the analyzer warning for the next line only
                  // ignore: use_build_context_synchronously
                  final XFile? result = await _livenessDetection.start(context: context, expressions: expressions);

                  if (result != null) {
                    setState(() {
                      imageFile = File(result.path);
                    });
                    // Ignore the analyzer warning for the next line only
                    // ignore: use_build_context_synchronously
                    ScaffoldMessenger.of(context).showSnackBar(
                      const SnackBar(content: Text('Verification Successful!')),
                    );
                  }
                } else {
                  // Ignore the analyzer warning for the next line only
                  // ignore: use_build_context_synchronously
                  ScaffoldMessenger.of(context).showSnackBar(
                    const SnackBar(content: Text('Camera not active!')),
                  );
                }
              },
              child: const Text(
                'Verify Now',
                style: TextStyle(fontWeight: FontWeight.bold, fontSize: 20),
              ),
            ),
          ],
        ),
      ),
    );
  }
}