详解Flutter扫码识别二维码内容

dependencies:
 ...
 barcode_scan: ^1.0.0

<!--获取相机权限-->
<uses-permission android:name="android.permission.CAMERA" />

<activity android:name="com.apptreesoftware.barcodescan.BarcodeScannerActivity"/>

buildscript {
  ext.kotlin_version = '1.2.31'
  ...
  dependencies {
    ...
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
  }
}
...

apply plugin: 'kotlin-android'
...
dependencies {
  implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
  ...
}

<key>NSCameraUsageDescription</key>
<string>Camera permission is required for barcode scanning.</string>

import 'package:barcode_scan/barcode_scan.dart';

// 扫描二维码
Future scan() async {
 try {
  // 此处为扫码结果，barcode为二维码的内容
  String barcode = await BarcodeScanner.scan();
  print('扫码结果: '+barcode);
 } on PlatformException catch (e) {
  if (e.code == BarcodeScanner.CameraAccessDenied) {
   // 未授予APP相机权限
   print('未授予APP相机权限');
  } else {
   // 扫码错误
   print('扫码错误: $e');
  }
 } on FormatException{
  // 进入扫码页面后未扫码就返回
  print('进入扫码页面后未扫码就返回');
 } catch (e) {
  // 扫码错误
  print('扫码错误: $e');
 }
}

flutter.pub-cachehostedpub.flutter-io.cnbarcode_scan-1.0.0androidsrcmainkotlincomapptreesoftwarebarcodescanBarcodeScannerActivity.kt
flutter.pub-cachehostedpub.flutter-io.cnbarcode_scan-1.0.0androidsrcmainkotlincomapptreesoftwarebarcodescanBarcodeScannerActivity.kt

flutter.pub-cachehostedpub.flutter-io.cnbarcode_scan-1.0.0iosClassesBarcodeScannerViewController.m