无法在barcode_scanner颤振中找到明确的活动类

Question

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}
def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
  throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {
    compileSdkVersion 28

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    lintOptions {
        disable 'InvalidPackage'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.example.pwlp"
        minSdkVersion 16
        targetSdkVersion 28
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.pwlp">

    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
         calls FlutterMain.startInitialization(this); in its onCreate method.
         In most cases you can leave this as-is, but you if you want to provide
         additional functionality it is fine to subclass or reimplement
         FlutterApplication and put your custom class here. -->
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.CAMERA"/>

    <application
        android:name="io.flutter.app.FlutterApplication"
        android:label="Partner Perks"
        android:icon="@mipmap/ic_launcher">
        <activity
            android:name=".MainActivity"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">
            <!-- This keeps the window background of the activity showing
                 until Flutter renders its first frame. It can be removed if
                 there is no splash screen (such as the default splash screen
                 defined in @style/LaunchTheme). -->
            <meta-data
                android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
                android:value="true" />
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <activity android:name="com.apptreesoftware.barcodescan.BarcodeScannerActivity"/>

    </application>

</manifest>

颤振中的条形码扫描仪：- 我已经为我的混合应用程序在颤振中集成了条形码扫描仪。 通过遵循这个 git 链接。 链接：-https://github.com/apptreesoftware/flutter_barcode_reader

一切顺利。我被安卓应用程序崩溃卡住了，

import 'package:flutter/material.dart';
import 'package:barcode_scan/barcode_scan.dart';
import 'package:flutter/services.dart';
import 'dart:async';

class Scanner extends StatefulWidget {
  @override
  _ScannerState createState() => _ScannerState();
}

class _ScannerState extends State<Scanner> {

  String result = "Hey there !";

  Future _scanQR() async {
    try {
      String qrResult = await BarcodeScanner.scan();
      setState(() {
        result = qrResult;
      });
    } on PlatformException catch (ex) {
      if (ex.code == BarcodeScanner.CameraAccessDenied) {
        setState(() {
          result = "Camera permission was denied";
          print(result);
        });
      } else {
        setState(() {
          result = "Unknown Error $ex";
          print(result);
        });
      }
    } on FormatException {
      setState(() {
        result = "You pressed the back button before scanning anything";
        print(result);
      });
    } catch (ex) {
      setState(() {
        result = "Unknown Error $ex";
        print(result);
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(

      body: Center(
        child: Text(
          result,
          style: new TextStyle(fontSize: 30.0, fontWeight: FontWeight.bold),
        ),
      ),
      floatingActionButton: FloatingActionButton.extended(
        icon: Icon(Icons.camera_alt),
        label: Text("Scan Now"),
        onPressed: _scanQR,
      ),
      floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
    );
  }
}

我收到一个错误：-

android.content.ActivityNotFoundException：找不到明确的活动类 {com.example.pwlp/com.apptreesoftware.barcodescan.BarcodeScannerActivity}；您是否在 AndroidManifest.xml 中声明了此活动？

任何建议或我已经做其他事情来解决。

请帮忙。 谢谢

Answer 1

我遇到了同样的问题，我删除了 flutter_app/android/.gradle 文件夹，它对我有用。