二维码扫描，从相册中扫
权限说明
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165
ln_jq_app/lib/pages/qr_code/controller.dart
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165
ln_jq_app/lib/pages/qr_code/controller.dart
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import 'dart:io';
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import 'dart:typed_data';
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import 'package:flutter/material.dart';
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import 'package:get/get.dart';
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import 'package:getx_scaffold/getx_scaffold.dart';
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import 'package:image/image.dart' as img;
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import 'package:image_picker/image_picker.dart';
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import 'package:qr_code_scanner_plus/qr_code_scanner_plus.dart';
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import 'package:zxing_lib/common.dart';
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import 'package:zxing_lib/qrcode.dart';
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import 'package:zxing_lib/zxing.dart';
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class QrCodeController extends GetxController
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with BaseControllerMixin, GetSingleTickerProviderStateMixin {
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@override
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String get builderId => 'qrcode';
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// --- Animation ---
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late final AnimationController animationController;
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late final Animation<double> scanAnimation;
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// --- QR Scanning ---
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final GlobalKey qrKey = GlobalKey(debugLabel: 'QR');
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QRViewController? qrViewController;
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final Rx<Barcode?> result = Rx<Barcode?>(null);
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final RxBool isFlashOn = false.obs;
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@override
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void onInit() {
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super.onInit();
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requestPermission();
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animationController = AnimationController(
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duration: const Duration(milliseconds: 2500),
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vsync: this,
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);
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scanAnimation = Tween<double>(begin: 0, end: 1).animate(animationController);
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animationController.repeat(reverse: false);
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}
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/// 当 QRView 创建时调用
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void onQRViewCreated(QRViewController controller) {
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this.qrViewController = controller;
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// 监听扫描到的数据
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controller.scannedDataStream.listen((scanData) {
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if (scanData.code != null && result.value?.code != scanData.code) {
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result.value = scanData;
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qrViewController?.pauseCamera();
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animationController.stop();
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renderResult(scanData.code!);
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}
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});
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}
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void resumeScanner() {
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result.value = null;
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qrViewController?.resumeCamera();
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animationController.repeat(reverse: false);
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}
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/// 从相册选择图片并扫描二维码
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void scanFromGallery() async {
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try {
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final XFile? imageFile = await ImagePicker().pickImage(source: ImageSource.gallery);
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if (imageFile == null) return; // 用户取消了选择
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qrViewController?.pauseCamera();
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animationController.stop();
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String? scanResult;
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try {
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final image = img.decodeImage(await File(imageFile.path).readAsBytes());
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if (image != null) {
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//扫描图片
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final pixels = Int32List.fromList(
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image.map((pixel) {
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return (pixel.a.toInt() << 24) |
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(pixel.r.toInt() << 16) |
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(pixel.g.toInt() << 8) |
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pixel.b.toInt();
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}).toList(),
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);
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final source = RGBLuminanceSource(image.width, image.height, pixels);
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final bitmap = BinaryBitmap(HybridBinarizer(source));
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final reader = QRCodeReader();
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final result = reader.decode(bitmap);
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scanResult = result.text;
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}
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} on NotFoundException {
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scanResult = null;
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} catch (e) {
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//异常
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scanResult = null;
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}
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if (scanResult != null) {
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renderResult(scanResult);
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} else {
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showErrorToast('未识别到二维码');
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resumeScanner();
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}
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} catch (e) {
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showErrorToast('从相册选择失败');
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resumeScanner();
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}
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}
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/// 切换闪光灯
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void toggleFlash() async {
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await qrViewController?.toggleFlash();
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isFlashOn.value = (await qrViewController?.getFlashStatus()) ?? false;
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}
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/// 翻转相机
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void flipCamera() async {
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await qrViewController?.flipCamera();
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}
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void requestPermission() async {
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final List<bool> results = await Future.wait([
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requestCameraPermission(),
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requestPhotosPermission(),
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]);
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final isCameraGranted = results[0];
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final isPhotosGranted = results[1];
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if (!isCameraGranted) {
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showErrorToast('相机权限未被授予，请到权限管理中打开');
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}
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if (!isPhotosGranted) {
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showErrorToast(
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'相册权限未被授予，请到权限管理中打开',
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);
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}
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}
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//扫码结果处理
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void renderResult(String resultStr) {
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Get.defaultDialog(
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title: "扫描结果",
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middleText: resultStr,
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onConfirm: () {
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Get.back();
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resumeScanner();
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},
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onCancel: () {
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resumeScanner();
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},
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);
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}
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@override
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void onClose() {
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qrViewController?.dispose();
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animationController.dispose();
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super.onClose();
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}
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}
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160
ln_jq_app/lib/pages/qr_code/view.dart
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160
ln_jq_app/lib/pages/qr_code/view.dart
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import 'package:flutter/material.dart';
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import 'package:get/get.dart';
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import 'package:getx_scaffold/getx_scaffold.dart';
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import 'package:qr_code_scanner_plus/qr_code_scanner_plus.dart';
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import 'controller.dart';
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class QrCodePage extends GetView<QrCodeController> {
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const QrCodePage({Key? key}) : super(key: key);
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@override
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Widget build(BuildContext context) {
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return GetBuilder<QrCodeController>(
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init: QrCodeController(),
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id: 'qrcode',
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builder: (_) {
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return Scaffold(
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extendBodyBehindAppBar: true,
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appBar: AppBar(
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title: const Text('扫码', style: TextStyle(color: Colors.white)),
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centerTitle: true,
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backgroundColor: Colors.transparent,
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elevation: 0,
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leading: IconButton(
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icon: const Icon(Icons.arrow_back_ios, color: Colors.white),
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onPressed: () => Get.back(),
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),
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actions: [
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TextButton(
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onPressed: controller.scanFromGallery,
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child: const Text(
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'相册',
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style: TextStyle(color: Colors.white, fontSize: 16),
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),
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),
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],
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),
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body: Stack(
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children: <Widget>[
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_buildQrView(context),
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Positioned(
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bottom: 80.h,
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left: 0,
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right: 0,
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child: _buildControlButtons(),
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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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/// 构建二维码扫描视图（带动画）
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Widget _buildQrView(BuildContext context) {
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// 定义扫描区域的大小
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var scanArea = (MediaQuery.of(context).size.width < 400 ||
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MediaQuery.of(context).size.height < 400)
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? 250.0
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: 300.0;
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return Stack(
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alignment: Alignment.center,
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children: <Widget>[
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// 底层是相机视图和半透明遮罩
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QRView(
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key: controller.qrKey,
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onQRViewCreated: controller.onQRViewCreated,
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overlay: QrScannerOverlayShape(
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borderColor: Colors.blueAccent,
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borderRadius: 10,
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borderLength: 30,
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borderWidth: 10,
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cutOutSize: scanArea,
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),
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),
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// 上层是扫描动画
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AnimatedBuilder(
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animation: controller.scanAnimation,
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builder: (context, child) {
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return Positioned(
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// 计算扫描框的顶部位置，以便动画从顶部开始
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top: (MediaQuery.of(context).size.height - scanArea) / 2,
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child: Transform.translate(
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offset: Offset(0, controller.scanAnimation.value * scanArea),
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child: Container(
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width: scanArea,
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height: 2, // 扫描线的高度
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decoration: BoxDecoration(
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color: Colors.blueAccent,
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boxShadow: [
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BoxShadow(
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color: Colors.blueAccent.withOpacity(0.7),
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blurRadius: 8,
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spreadRadius: 2,
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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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}
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/// 构建底部的控制按钮
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Widget _buildControlButtons() {
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return Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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const Text(
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'将二维码/条形码放入框内，即可自动扫描',
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style: TextStyle(color: Colors.white, fontSize: 14),
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),
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const SizedBox(height: 20),
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Row(
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mainAxisAlignment: MainAxisAlignment.spaceEvenly,
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crossAxisAlignment: CrossAxisAlignment.center,
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children: <Widget>[
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// 闪光灯按钮
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_buildIconButton(
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onPressed: controller.toggleFlash,
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//闪光灯状态的变化
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child: Obx(() => Icon(
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controller.isFlashOn.value ? Icons.flash_on : Icons.flash_off,
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color: Colors.white,
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size: 28,
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)),
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),
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// 翻转相机按钮
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_buildIconButton(
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onPressed: controller.flipCamera,
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child: const Icon(
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Icons.flip_camera_ios,
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color: Colors.white,
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size: 28,
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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 _buildIconButton({required VoidCallback onPressed, required Widget child}) {
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return Container(
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decoration: BoxDecoration(
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color: Colors.black.withOpacity(0.3),
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shape: BoxShape.circle,
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),
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child: IconButton(
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onPressed: onPressed,
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icon: child,
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iconSize: 32, // 增大点击区域
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),
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);
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}
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}
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