476 lines
14 KiB
Dart
476 lines
14 KiB
Dart
import 'dart:async';
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import 'dart:io';
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import 'package:flutter/services.dart';
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import 'package:camera/camera.dart';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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import 'package:permission_handler/permission_handler.dart' as ph;
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import 'package:qhd_prevention/customWidget/custom_alert_dialog.dart';
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import 'package:qhd_prevention/customWidget/custom_button.dart';
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import 'package:qhd_prevention/customWidget/toast_util.dart';
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import 'package:qhd_prevention/http/ApiService.dart';
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import 'package:qhd_prevention/pages/my_appbar.dart';
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import 'package:qhd_prevention/tools/tools.dart';
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// 在类最上面（State 内）加入一个 channel 常量
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const MethodChannel _platformChan = MethodChannel('qhd_prevention/permissions');
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/// 人脸识别模式
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enum FaceMode { auto, manual }
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class FaceRecognitionPage extends StatefulWidget {
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final String studentId;
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final String VIDEOCOURSEWARE_ID;
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final String CURRICULUM_ID;
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final String CHAPTER_ID;
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final String CLASS_ID;
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final FaceMode mode;
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const FaceRecognitionPage({
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Key? key,
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required this.studentId,
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required this.VIDEOCOURSEWARE_ID,
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required this.CURRICULUM_ID,
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required this.CHAPTER_ID,
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required this.CLASS_ID,
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this.mode = FaceMode.auto,
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}) : super(key: key);
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@override
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_FaceRecognitionPageState createState() => _FaceRecognitionPageState();
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}
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class _FaceRecognitionPageState extends State<FaceRecognitionPage>
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with WidgetsBindingObserver {
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CameraController? _cameraController;
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Timer? _timer;
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int _attempts = 0;
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static const int _maxAttempts = 8;
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static const Duration _interval = Duration(seconds: 2);
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String _errMsg = '';
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bool get _isManualMode => widget.mode == FaceMode.manual;
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bool _isInitializing = false;
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bool _isTaking = false;
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@override
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void initState() {
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super.initState();
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WidgetsBinding.instance.addObserver(this);
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// 延迟到首帧渲染后再请求权限并初始化相机，避免 iOS 在还未准备好时错过系统弹窗
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WidgetsBinding.instance.addPostFrameCallback((_) {
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_initCameraWithPermission();
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});
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}
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@override
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void dispose() {
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WidgetsBinding.instance.removeObserver(this);
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_timer?.cancel();
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try {
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_cameraController?.dispose();
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} catch (_) {}
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super.dispose();
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}
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// 生命周期：后台/前台切换时处理相机释放/恢复
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@override
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void didChangeAppLifecycleState(AppLifecycleState state) {
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if (_cameraController == null || !_cameraController!.value.isInitialized) {
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return;
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}
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if (state == AppLifecycleState.inactive) {
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// 可选：释放相机，节省资源
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try {
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_cameraController?.dispose();
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} catch (_) {}
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_cameraController = null;
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} else if (state == AppLifecycleState.resumed) {
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// 恢复时重新初始化相机（并会再次请求权限）
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if (!_isInitializing) {
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_initCameraWithPermission();
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}
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}
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}
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/// 请求 camera 权限（iOS：优先走原生 AVCaptureDevice.requestAccess；Android：使用 permission_handler）
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Future<bool> _requestCameraPermission() async {
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try {
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// iOS：使用原生 API 强制唤起系统授权弹窗
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if (Platform.isIOS) {
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try {
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final dynamic res = await _platformChan.invokeMethod('requestCameraAccess');
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// 原生返回 true/false
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if (res == true) {
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debugPrint('[FaceRecognition] iOS native camera access granted');
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return true;
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} else {
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debugPrint('[FaceRecognition] iOS native camera access denied');
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// 如果被拒绝（非永久还是永久都返回 false），再根据 permission_handler 的状态做后续提示/引导
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final status = await ph.Permission.camera.status;
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if (status.isPermanentlyDenied) {
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await _showPermissionDialog(permanent: true);
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} else {
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await _showPermissionDialog(permanent: false);
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}
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return false;
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}
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} on PlatformException catch (e) {
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debugPrint('[FaceRecognition] platform channel error: $e — fallback to permission_handler');
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// 如果 platform channel 异常，回退到 permission_handler
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}
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}
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// 非 iOS 或 platform 调用失败时走 permission_handler（保证 Android 正常）
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final result = await ph.Permission.camera.request();
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debugPrint('[FaceRecognition] permission_handler camera result: $result');
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if (result.isGranted) return true;
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if (result.isPermanentlyDenied) {
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await _showPermissionDialog(permanent: true);
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return false;
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}
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if (result.isDenied) {
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await _showPermissionDialog(permanent: false);
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return false;
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}
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if (result.isRestricted) {
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if (mounted) ToastUtil.showNormal(context, '相机权限受限，无法使用本功能');
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return false;
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}
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if (result.isLimited) {
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if (mounted) ToastUtil.showNormal(context, '相机权限受限（limited）');
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return false;
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}
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return false;
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} catch (e) {
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debugPrint('[FaceRecognition] permission request error: $e');
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if (mounted) ToastUtil.showNormal(context, '请求相机权限时出错');
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return false;
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}
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}
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/// 显示权限被拒/永久拒绝对话框（区分 permanent）
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Future<void> _showPermissionDialog({required bool permanent}) async {
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if (!mounted) return;
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await CustomAlertDialog.showConfirm(
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context,
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title: '需要相机权限',
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content:
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permanent
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? '检测到相机权限已被永久拒绝，请到系统设置中打开相机权限以继续使用人脸识别功能。'
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: '相机权限被拒绝，是否重试或前往设置打开权限？',
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cancelText: '取消',
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onConfirm: () async {
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try {
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final retry = await ph.Permission.camera.request();
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debugPrint('[FaceRecognition] retry request result: $retry');
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if (retry.isGranted) {
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if (mounted) await _initCamera();
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} else if (retry.isPermanentlyDenied) {
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try {
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await ph.openAppSettings();
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} catch (e) {
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debugPrint('[FaceRecognition] openAppSettings error: $e');
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if (mounted) ToastUtil.showNormal(context, '无法打开设置，请手动前往系统设置授权');
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}
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} else {
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if (mounted) ToastUtil.showNormal(context, '相机权限未授予');
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}
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} catch (e) {
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debugPrint('[FaceRecognition] retry request error: $e');
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}
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},
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);
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}
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/// 初始化：先请求权限，再打开相机
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Future<void> _initCameraWithPermission() async {
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if (!mounted) return;
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final ok = await _requestCameraPermission();
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if (!ok) return;
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await _initCamera();
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}
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Future<void> _initCamera() async {
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if (_isInitializing) return;
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_isInitializing = true;
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try {
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final cams = await availableCameras();
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CameraDescription? front;
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try {
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front = cams.firstWhere(
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(c) => c.lensDirection == CameraLensDirection.front,
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);
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} catch (_) {
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if (cams.isNotEmpty) front = cams.first;
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}
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if (front == null) {
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if (!mounted) return;
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ToastUtil.showError(context, '未检测到可用摄像头');
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_isInitializing = false;
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return;
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}
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_cameraController = CameraController(
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front,
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ResolutionPreset.medium,
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enableAudio: false,
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imageFormatGroup: ImageFormatGroup.yuv420,
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);
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await _cameraController!.initialize();
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// 尽量关闭闪光
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try {
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await _cameraController!.setFlashMode(FlashMode.off);
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} catch (_) {}
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if (!mounted) return;
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setState(() {});
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// 启动自动拍照定时器（若为自动模式）
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_timer?.cancel();
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_attempts = 0;
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if (!_isManualMode) {
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_timer = Timer.periodic(_interval, (_) => _captureAndUpload());
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}
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} catch (e, st) {
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debugPrint('[FaceRecognition] init camera error: $e\n$st');
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if (mounted) {
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ToastUtil.showError(context, '初始化摄像头失败');
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}
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} finally {
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_isInitializing = false;
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}
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}
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/// 自动模式：定时拍照并上传
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Future<void> _captureAndUpload() async {
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if (_isManualMode) return;
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if (_cameraController == null || !_cameraController!.value.isInitialized)
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return;
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if (_attempts >= _maxAttempts) return _onTimeout();
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if (_isTaking) return;
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_isTaking = true;
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_attempts++;
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try {
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try {
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await _cameraController!.setFlashMode(FlashMode.off);
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} catch (_) {}
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final XFile pic = await _cameraController!.takePicture();
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final res = await ApiService.getUserFace(pic.path, widget.studentId,
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widget.VIDEOCOURSEWARE_ID,widget.CURRICULUM_ID,widget.CHAPTER_ID,widget.CLASS_ID,);
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if (res['result'] == 'success') {
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_onSuccess();
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} else {
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if (!mounted) return;
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setState(() {
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_errMsg = (res['msg'] ?? '').toString();
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});
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}
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} catch (e, st) {
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debugPrint('[FaceRecognition] capture error: $e\n$st');
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// 忽略单次异常，等待下一次尝试
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} finally {
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_isTaking = false;
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}
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}
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/// 手动拍照并上传
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Future<void> _captureAndReload() async {
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if (_cameraController == null || !_cameraController!.value.isInitialized)
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return;
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if (_isTaking) return;
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_isTaking = true;
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_showLoading();
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try {
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// 再次确认 camera 权限（以防用户运行时撤销）
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final status = await ph.Permission.camera.status;
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if (!status.isGranted) {
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final ok = await _requestCameraPermission();
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if (!ok) {
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_hideLoading();
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_isTaking = false;
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return;
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}
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}
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try {
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await _cameraController!.setFlashMode(FlashMode.off);
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} catch (_) {}
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final XFile pic = await _cameraController!.takePicture();
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final res = await ApiService.reloadMyFace(pic.path, widget.studentId);
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_hideLoading();
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if (res['result'] == 'success') {
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_onSuccess();
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} else {
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ToastUtil.showError(context, '验证失败，请重试');
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}
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} catch (e, st) {
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debugPrint('[FaceRecognition] manual capture error: $e\n$st');
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_hideLoading();
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ToastUtil.showError(context, '拍照失败，请重试');
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} finally {
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_isTaking = false;
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}
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}
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void _onSuccess() {
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_timer?.cancel();
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if (widget.mode == FaceMode.manual) {
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ToastUtil.showSuccess(context, '已更新人脸信息');
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Future.delayed(const Duration(milliseconds: 800), () {
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if (mounted) Navigator.of(context).pop(true);
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});
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return;
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}
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Future.delayed(const Duration(milliseconds: 800), () {
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if (mounted) Navigator.of(context).pop(true);
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});
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}
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void _onTimeout() {
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_timer?.cancel();
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ToastUtil.showError(context, '人脸超时，请重新识别！');
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Future.delayed(const Duration(seconds: 3), () {
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if (mounted) Navigator.of(context).pop(false);
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});
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}
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void _showLoading() {
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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: (_) => const Center(child: CircularProgressIndicator()),
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);
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}
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void _hideLoading() {
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if (!mounted) return;
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if (Navigator.canPop(context)) Navigator.pop(context);
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}
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void _showToast(String msg) {
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ToastUtil.showNormal(context, msg);
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}
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@override
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Widget build(BuildContext context) {
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if (_cameraController == null || !_cameraController!.value.isInitialized) {
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return const Scaffold(
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backgroundColor: Colors.white,
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body: Center(child: CircularProgressIndicator()),
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);
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}
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final previewSize = _cameraController!.value.previewSize!;
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final previewAspect = previewSize.height / previewSize.width;
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final radius = (screenWidth(context) - 100) / 2;
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return Scaffold(
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backgroundColor: Colors.white,
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appBar: const MyAppbar(title: '人脸识别'),
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body: Stack(
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children: [
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Positioned.fill(child: Container(color: Colors.white)),
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Transform.translate(
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offset: const Offset(0, -100),
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child: Stack(
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children: [
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Center(
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child: ClipOval(
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child: AspectRatio(
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aspectRatio: previewAspect,
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child: CameraPreview(_cameraController!),
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),
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),
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),
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Positioned.fill(
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child: CustomPaint(
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painter: _WhiteMaskPainter(radius: radius),
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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.center,
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child: Padding(
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padding: const EdgeInsets.only(top: 250),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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const Text(
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'请将人脸置于圆圈内',
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style: TextStyle(fontSize: 16, color: Colors.black87),
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textAlign: TextAlign.center,
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),
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if (_errMsg.isNotEmpty)
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Padding(
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padding: const EdgeInsets.only(top: 6.0),
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child: Text(
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_errMsg,
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style: const TextStyle(fontSize: 14, color: Colors.red),
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textAlign: TextAlign.center,
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),
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),
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const SizedBox(height: 20),
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if (_isManualMode)
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CustomButton(
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text: '拍照/上传',
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backgroundColor: Colors.blue,
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onPressed: _captureAndReload,
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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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class _WhiteMaskPainter extends CustomPainter {
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final double radius;
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_WhiteMaskPainter({required this.radius});
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@override
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void paint(Canvas canvas, Size size) {
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canvas.saveLayer(Offset.zero & size, Paint());
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canvas.drawRect(Offset.zero & size, Paint()..color = Colors.white);
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canvas.drawCircle(
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size.center(Offset.zero),
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radius,
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Paint()..blendMode = BlendMode.clear,
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);
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canvas.restore();
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}
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@override
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bool shouldRepaint(covariant CustomPainter old) => false;
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}
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