视觉分析(模拟)app
This commit is contained in:
lzx
462
lib/screens/camera_screen.dart
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462
lib/screens/camera_screen.dart
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import 'dart:async';
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import 'dart:io';
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import 'package:camera/camera.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/foundation.dart' show kIsWeb;
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import 'package:image_picker/image_picker.dart';
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import 'package:gal/gal.dart';
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import 'package:path_provider/path_provider.dart';
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import 'package:path/path.dart' as path;
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import 'package:permission_handler/permission_handler.dart';
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import 'package:camera_app/services/yolo_service.dart';
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import 'package:camera_app/screens/result_screen.dart';
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class CameraScreen extends StatefulWidget {
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const CameraScreen({super.key});
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@override
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State<CameraScreen> createState() => _CameraScreenState();
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}
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class _CameraScreenState extends State<CameraScreen> {
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CameraController? _controller;
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List<CameraDescription>? _cameras;
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bool _isInitialized = false;
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bool _isCapturing = false;
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int _photoCount = 0;
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Timer? _timer;
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List<String> _savedPhotoPaths = [];
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bool _isWebOrDesktop = false;
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final YOLOService _yoloService = YOLOService();
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@override
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void initState() {
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super.initState();
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_initializeCamera();
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}
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Future<void> _initializeCamera() async {
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try {
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// Web 和桌面平台使用 image_picker
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if (kIsWeb || (!Platform.isAndroid && !Platform.isIOS)) {
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if (mounted) {
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setState(() {
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_isWebOrDesktop = true;
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_isInitialized = true; // Web/桌面平台直接显示界面
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});
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}
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return;
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}
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// 移动平台使用 camera 包
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await _requestPermissions();
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_cameras = await availableCameras();
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if (_cameras == null || _cameras!.isEmpty) {
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_showError('未找到可用的相机');
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return;
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}
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_controller = CameraController(
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_cameras![0],
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ResolutionPreset.high,
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enableAudio: false,
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);
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await _controller!.initialize();
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if (mounted) {
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setState(() {
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_isInitialized = true;
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});
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}
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} catch (e) {
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_showError('初始化相机失败: $e');
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}
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}
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Future<void> _requestPermissions() async {
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if (kIsWeb || (!Platform.isAndroid && !Platform.isIOS)) {
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return; // Web/桌面平台权限由浏览器/系统处理
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}
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final cameraStatus = await Permission.camera.request();
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if (!cameraStatus.isGranted) {
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_showError('需要相机权限才能使用此功能');
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return;
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}
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if (Platform.isAndroid) {
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final photosStatus = await Permission.photos.request();
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if (photosStatus.isDenied || photosStatus.isPermanentlyDenied) {
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final storageStatus = await Permission.storage.request();
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if (!storageStatus.isGranted) {
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_showError('需要存储权限才能保存图片');
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return;
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}
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}
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} else if (Platform.isIOS) {
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final photosStatus = await Permission.photos.request();
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if (!photosStatus.isGranted) {
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_showError('需要照片权限才能保存图片');
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return;
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}
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}
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}
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Future<void> _startCapturing() async {
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if (_isWebOrDesktop) {
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_showError('Web/桌面平台不支持自动连续拍照，请使用移动设备');
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return;
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}
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// 移动平台：自动拍照模式
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if (!_isInitialized || _controller == null || !_controller!.value.isInitialized) {
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_showError('相机未初始化');
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return;
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}
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setState(() {
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_isCapturing = true;
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_photoCount = 0;
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_savedPhotoPaths.clear();
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});
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// 立即拍摄第一张
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await _takePhoto();
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// 然后每2秒拍摄一张，直到点击停止
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_timer = Timer.periodic(const Duration(seconds: 2), (timer) async {
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if (_isCapturing) {
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await _takePhoto();
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} else {
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timer.cancel();
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}
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});
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}
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Future<void> _stopCapturing() async {
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setState(() {
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_isCapturing = false;
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});
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_timer?.cancel();
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if (_savedPhotoPaths.isEmpty) {
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_showError('没有拍摄照片');
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return;
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}
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// 显示分析中对话框
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if (!mounted) return;
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showDialog(
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context: context,
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barrierDismissible: false,
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builder: (BuildContext context) {
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return const AlertDialog(
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content: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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CircularProgressIndicator(),
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SizedBox(height: 16),
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Text('正在分析照片...'),
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],
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),
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);
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},
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);
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try {
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// 使用YOLO分析照片
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final analysisResults = await _yoloService.analyzeImages(_savedPhotoPaths);
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if (!mounted) return;
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Navigator.of(context).pop(); // 关闭分析中对话框
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// 导航到结果页面
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Navigator.of(context).pushReplacement(
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MaterialPageRoute(
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builder: (context) => ResultScreen(
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photoPaths: _savedPhotoPaths,
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analysisResults: analysisResults,
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),
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),
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);
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} catch (e) {
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if (!mounted) return;
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Navigator.of(context).pop(); // 关闭分析中对话框
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_showError('分析照片失败: $e');
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}
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}
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Future<void> _takePhoto() async {
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if (_controller == null || !_controller!.value.isInitialized) {
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return;
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}
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try {
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final XFile photo = await _controller!.takePicture();
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await _savePhoto(photo.path);
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if (mounted) {
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setState(() {
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_photoCount++;
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});
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}
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} catch (e) {
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if (mounted) {
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_showError('拍照失败: $e');
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}
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}
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}
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Future<void> _savePhoto(String photoPath) async {
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try {
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if (!kIsWeb && (Platform.isAndroid || Platform.isIOS)) {
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// 移动平台：保存到相册
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await Gal.putImage(photoPath);
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} else {
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// Web/桌面平台：保存到下载目录
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final appDir = await getApplicationDocumentsDirectory();
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final fileName = 'photo_${DateTime.now().millisecondsSinceEpoch}.jpg';
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final savedPath = path.join(appDir.path, fileName);
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await File(photoPath).copy(savedPath);
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}
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_savedPhotoPaths.add(photoPath);
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} catch (e) {
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// 保存失败不影响流程
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_savedPhotoPaths.add(photoPath);
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}
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}
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void _showError(String message) {
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if (mounted) {
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(
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content: Text(message),
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backgroundColor: Colors.red,
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),
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);
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}
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}
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@override
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void dispose() {
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_timer?.cancel();
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_controller?.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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if (!_isInitialized) {
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return Scaffold(
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backgroundColor: Colors.black,
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body: const Center(
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child: CircularProgressIndicator(color: Colors.white),
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),
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);
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}
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// Web/桌面平台界面
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if (_isWebOrDesktop) {
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return Scaffold(
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backgroundColor: Colors.black,
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body: Center(
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child: Padding(
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padding: const EdgeInsets.all(24.0),
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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const Icon(
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Icons.camera_alt,
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size: 100,
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color: Colors.white,
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),
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const SizedBox(height: 32),
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Text(
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'$_photoCount 张',
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style: const TextStyle(
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color: Colors.white,
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fontSize: 48,
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fontWeight: FontWeight.bold,
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),
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),
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const SizedBox(height: 16),
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const Text(
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'Web/桌面平台不支持自动连续拍照',
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style: TextStyle(
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color: Colors.white70,
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fontSize: 18,
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),
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textAlign: TextAlign.center,
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),
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const SizedBox(height: 48),
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IconButton(
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icon: const Icon(Icons.arrow_back, color: Colors.white),
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onPressed: () => Navigator.of(context).pop(),
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tooltip: '返回',
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),
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],
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),
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),
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),
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);
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}
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// 移动平台：显示相机预览
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if (_controller == null || !_controller!.value.isInitialized) {
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return Scaffold(
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backgroundColor: Colors.black,
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body: const Center(
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child: Text(
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'相机初始化中...',
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style: TextStyle(color: Colors.white),
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),
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),
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);
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}
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return Scaffold(
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backgroundColor: Colors.black,
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body: Stack(
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children: [
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SizedBox.expand(child: CameraPreview(_controller!)),
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SafeArea(
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child: Container(
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padding: const EdgeInsets.all(16),
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decoration: BoxDecoration(
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gradient: LinearGradient(
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begin: Alignment.topCenter,
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end: Alignment.bottomCenter,
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colors: [
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Colors.black.withOpacity(0.7),
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Colors.transparent,
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],
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),
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),
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child: Row(
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mainAxisAlignment: MainAxisAlignment.spaceBetween,
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children: [
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IconButton(
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icon: const Icon(Icons.arrow_back, color: Colors.white),
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onPressed: () {
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if (_isCapturing) {
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_stopCapturing();
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}
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Navigator.of(context).pop();
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},
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),
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if (_isCapturing)
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Container(
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padding: const EdgeInsets.symmetric(
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horizontal: 16,
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vertical: 8,
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),
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decoration: BoxDecoration(
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color: Colors.red.withOpacity(0.8),
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borderRadius: BorderRadius.circular(20),
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),
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child: Row(
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children: [
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Container(
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width: 12,
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height: 12,
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decoration: const BoxDecoration(
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color: Colors.white,
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shape: BoxShape.circle,
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),
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),
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const SizedBox(width: 8),
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Text(
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'$_photoCount 张',
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style: const TextStyle(
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color: Colors.white,
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fontSize: 16,
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fontWeight: FontWeight.bold,
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),
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),
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],
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),
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),
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],
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),
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),
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),
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Align(
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alignment: Alignment.bottomCenter,
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child: Container(
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padding: const EdgeInsets.all(32),
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decoration: BoxDecoration(
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gradient: LinearGradient(
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begin: Alignment.bottomCenter,
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end: Alignment.topCenter,
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colors: [
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Colors.black.withOpacity(0.7),
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Colors.transparent,
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],
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),
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),
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child: _isCapturing
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? Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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ElevatedButton.icon(
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onPressed: _stopCapturing,
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icon: const Icon(Icons.stop, size: 28),
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label: const Text(
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'停止拍照',
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style: TextStyle(fontSize: 18),
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),
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style: ElevatedButton.styleFrom(
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backgroundColor: Colors.red,
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foregroundColor: Colors.white,
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padding: const EdgeInsets.symmetric(
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horizontal: 32,
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vertical: 16,
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),
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shape: RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(30),
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),
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),
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),
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const SizedBox(height: 16),
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Text(
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'已拍摄 $_photoCount 张照片',
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style: const TextStyle(
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color: Colors.white,
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fontSize: 16,
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),
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),
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],
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)
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: ElevatedButton.icon(
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onPressed: _startCapturing,
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icon: const Icon(Icons.camera_alt, size: 28),
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label: const Text(
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'开始拍照',
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style: TextStyle(fontSize: 18),
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),
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style: ElevatedButton.styleFrom(
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backgroundColor: Colors.white,
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foregroundColor: Colors.black,
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padding: const EdgeInsets.symmetric(
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horizontal: 32,
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vertical: 16,
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),
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shape: RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(30),
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),
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),
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),
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),
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),
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],
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),
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);
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}
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}
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Reference in New Issue
Block a user