二维码扫描，从相册中扫

权限说明

ln_jq_app/lib/pages/qr_code/controller.dart

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+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:flutter/material.dart';
+import 'package:get/get.dart';
+import 'package:getx_scaffold/getx_scaffold.dart';
+import 'package:image/image.dart' as img;
+import 'package:image_picker/image_picker.dart';
+import 'package:qr_code_scanner_plus/qr_code_scanner_plus.dart';
+import 'package:zxing_lib/common.dart';
+import 'package:zxing_lib/qrcode.dart';
+import 'package:zxing_lib/zxing.dart';
+
+class QrCodeController extends GetxController
+    with BaseControllerMixin, GetSingleTickerProviderStateMixin {
+  @override
+  String get builderId => 'qrcode';
+
+  // --- Animation ---
+  late final AnimationController animationController;
+  late final Animation<double> scanAnimation;
+
+  // --- QR Scanning ---
+  final GlobalKey qrKey = GlobalKey(debugLabel: 'QR');
+  QRViewController? qrViewController;
+  final Rx<Barcode?> result = Rx<Barcode?>(null);
+  final RxBool isFlashOn = false.obs;
+
+  @override
+  void onInit() {
+    super.onInit();
+    requestPermission();
+
+    animationController = AnimationController(
+      duration: const Duration(milliseconds: 2500),
+      vsync: this,
+    );
+    scanAnimation = Tween<double>(begin: 0, end: 1).animate(animationController);
+    animationController.repeat(reverse: false);
+  }
+
+  /// 当 QRView 创建时调用
+  void onQRViewCreated(QRViewController controller) {
+    this.qrViewController = controller;
+    // 监听扫描到的数据
+    controller.scannedDataStream.listen((scanData) {
+      if (scanData.code != null && result.value?.code != scanData.code) {
+        result.value = scanData;
+        qrViewController?.pauseCamera();
+
+        animationController.stop();
+
+        renderResult(scanData.code!);
+      }
+    });
+  }
+
+  void resumeScanner() {
+    result.value = null;
+    qrViewController?.resumeCamera();
+    animationController.repeat(reverse: false);
+  }
+
+  /// 从相册选择图片并扫描二维码
+  void scanFromGallery() async {
+    try {
+      final XFile? imageFile = await ImagePicker().pickImage(source: ImageSource.gallery);
+      if (imageFile == null) return; // 用户取消了选择
+
+      qrViewController?.pauseCamera();
+      animationController.stop();
+
+      String? scanResult;
+      try {
+        final image = img.decodeImage(await File(imageFile.path).readAsBytes());
+        if (image != null) {
+          //扫描图片
+          final pixels = Int32List.fromList(
+            image.map((pixel) {
+              return (pixel.a.toInt() << 24) |
+                  (pixel.r.toInt() << 16) |
+                  (pixel.g.toInt() << 8) |
+                  pixel.b.toInt();
+            }).toList(),
+          );
+
+          final source = RGBLuminanceSource(image.width, image.height, pixels);
+
+          final bitmap = BinaryBitmap(HybridBinarizer(source));
+          final reader = QRCodeReader();
+          final result = reader.decode(bitmap);
+          scanResult = result.text;
+        }
+      } on NotFoundException {
+        scanResult = null;
+      } catch (e) {
+        //异常
+        scanResult = null;
+      }
+
+      if (scanResult != null) {
+        renderResult(scanResult);
+      } else {
+        showErrorToast('未识别到二维码');
+        resumeScanner();
+      }
+    } catch (e) {
+      showErrorToast('从相册选择失败');
+      resumeScanner();
+    }
+  }
+
+  /// 切换闪光灯
+  void toggleFlash() async {
+    await qrViewController?.toggleFlash();
+    isFlashOn.value = (await qrViewController?.getFlashStatus()) ?? false;
+  }
+
+  /// 翻转相机
+  void flipCamera() async {
+    await qrViewController?.flipCamera();
+  }
+
+  void requestPermission() async {
+    final List<bool> results = await Future.wait([
+      requestCameraPermission(),
+      requestPhotosPermission(),
+    ]);
+
+    final isCameraGranted = results[0];
+    final isPhotosGranted = results[1];
+
+    if (!isCameraGranted) {
+      showErrorToast('相机权限未被授予，请到权限管理中打开');
+    }
+    if (!isPhotosGranted) {
+      showErrorToast(
+        '相册权限未被授予，请到权限管理中打开',
+      );
+    }
+  }
+
+  //扫码结果处理
+  void renderResult(String resultStr) {
+    Get.defaultDialog(
+      title: "扫描结果",
+      middleText: resultStr,
+      onConfirm: () {
+        Get.back();
+        resumeScanner();
+      },
+      onCancel: () {
+        resumeScanner();
+      },
+    );
+
+  }
+
+  @override
+  void onClose() {
+    qrViewController?.dispose();
+    animationController.dispose();
+    super.onClose();
+  }
+}