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290
aisee_flutter/lib/screens/camera_screen.dart
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290
aisee_flutter/lib/screens/camera_screen.dart
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import 'package:flutter/material.dart';
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import 'package:camera/camera.dart';
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import 'package:provider/provider.dart';
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import 'package:permission_handler/permission_handler.dart';
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import '../services/camera_service.dart';
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import '../services/api_service.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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late CameraService _cameraService;
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late ApiService _apiService;
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bool _isProcessing = false;
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String _statusMessage = '准备就绪';
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int _frameCount = 0;
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int _uploadCount = 0;
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@override
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void initState() {
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super.initState();
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_cameraService = CameraService();
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_apiService = ApiService();
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_initializeCamera();
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}
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Future<void> _initializeCamera() async {
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// 请求相机权限
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final status = await Permission.camera.request();
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if (!status.isGranted) {
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setState(() {
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_statusMessage = '相机权限被拒绝';
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});
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return;
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}
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// 初始化相机
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await _cameraService.initialize();
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if (mounted) {
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setState(() {
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_statusMessage = '相机已就绪';
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});
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}
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}
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/// 开始实时传输
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void _startStreaming() {
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if (_cameraService.isStreaming) return;
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setState(() {
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_statusMessage = '实时传输中...';
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_frameCount = 0;
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_uploadCount = 0;
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});
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_cameraService.startStreaming((imageBytes) async {
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setState(() {
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_frameCount++;
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});
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// 上传到后端（异步，不阻塞捕获）
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_uploadToBackend(imageBytes);
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});
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}
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/// 停止实时传输
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void _stopStreaming() {
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_cameraService.stopStreaming();
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setState(() {
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_statusMessage = '已停止传输';
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});
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}
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/// 上传图像到后端
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Future<void> _uploadToBackend(imageBytes) async {
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if (_isProcessing) return; // 防止并发上传
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_isProcessing = true;
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try {
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// 上传图像
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final result = await _apiService.uploadImage(imageBytes);
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setState(() {
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_uploadCount++;
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_statusMessage = '已上传 $_uploadCount 帧';
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});
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print('上传成功: ${result['image_id']}');
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} catch (e) {
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print('上传失败: $e');
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setState(() {
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_statusMessage = '上传失败: $e';
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});
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} finally {
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_isProcessing = false;
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}
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}
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/// 拍摄单张照片并分析
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Future<void> _captureAndAnalyze() async {
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setState(() {
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_statusMessage = '正在拍照...';
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});
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final imageBytes = await _cameraService.takePicture();
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if (imageBytes == null) {
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setState(() {
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_statusMessage = '拍照失败';
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});
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return;
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}
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setState(() {
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_statusMessage = '正在分析...';
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});
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try {
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// 上传并分析
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final result = await _apiService.uploadAndAnalyze(imageBytes);
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setState(() {
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_statusMessage = '分析完成';
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});
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// 显示结果
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_showAnalysisResult(result);
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} catch (e) {
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setState(() {
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_statusMessage = '分析失败: $e';
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});
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}
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}
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/// 显示分析结果
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void _showAnalysisResult(Map<String, dynamic> result) {
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showDialog(
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context: context,
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builder: (context) => AlertDialog(
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title: const Text('分析结果'),
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content: SingleChildScrollView(
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child: Text(result.toString()),
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),
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actions: [
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TextButton(
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onPressed: () => Navigator.pop(context),
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child: const Text('关闭'),
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),
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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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_cameraService.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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return Scaffold(
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appBar: AppBar(
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title: const Text('实时相机'),
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backgroundColor: Colors.black,
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),
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body: _cameraService.isInitialized
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? _buildCameraView()
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: const Center(child: CircularProgressIndicator()),
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);
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}
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Widget _buildCameraView() {
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return Stack(
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children: [
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// 相机预览
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Positioned.fill(
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child: CameraPreview(_cameraService.controller!),
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),
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// 状态信息
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Positioned(
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top: 16,
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left: 16,
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right: 16,
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child: Container(
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padding: const EdgeInsets.all(12),
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decoration: BoxDecoration(
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color: Colors.black.withOpacity(0.7),
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borderRadius: BorderRadius.circular(8),
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),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Text(
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_statusMessage,
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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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const SizedBox(height: 4),
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Text(
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'捕获帧数: $_frameCount | 上传帧数: $_uploadCount',
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style: const TextStyle(
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color: Colors.white70,
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fontSize: 14,
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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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// 控制按钮
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Positioned(
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bottom: 32,
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left: 0,
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right: 0,
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child: Row(
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mainAxisAlignment: MainAxisAlignment.spaceEvenly,
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children: [
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// 拍照并分析按钮
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_buildControlButton(
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icon: Icons.camera_alt,
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label: '拍照分析',
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onPressed: _captureAndAnalyze,
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color: Colors.blue,
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),
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// 开始/停止实时传输按钮
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_buildControlButton(
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icon: _cameraService.isStreaming ? Icons.stop : Icons.play_arrow,
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label: _cameraService.isStreaming ? '停止传输' : '开始传输',
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onPressed: _cameraService.isStreaming ? _stopStreaming : _startStreaming,
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color: _cameraService.isStreaming ? Colors.red : Colors.green,
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),
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// 切换摄像头按钮
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_buildControlButton(
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icon: Icons.flip_camera_android,
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label: '切换',
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onPressed: () => _cameraService.switchCamera(),
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color: Colors.orange,
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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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Widget _buildControlButton({
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required IconData icon,
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required String label,
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required VoidCallback onPressed,
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required Color color,
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}) {
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return Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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FloatingActionButton(
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onPressed: onPressed,
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backgroundColor: color,
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child: Icon(icon, size: 32),
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),
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const SizedBox(height: 8),
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Text(
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label,
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style: const TextStyle(
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color: Colors.white,
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fontSize: 12,
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fontWeight: FontWeight.bold,
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shadows: [
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Shadow(
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color: Colors.black,
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blurRadius: 4,
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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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