无法在条形码扫描器颤振中找到明确的活动类别

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>

条码扫描器抖动：-我已经在杂波应用程序中集成了条码扫描器。通过遵循此git链接。链接：-https://github.com/apptreesoftware/flutter_barcode_reader

一切都很好。我被android应用程序崩溃困住了，

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,
    );
  }
}

我遇到错误：-

android.content.ActivityNotFoundException：无法找到显式的活动类{com.example.pwlp / com.apptreesoftware.barcodescan.BarcodeScannerActivity}；您是否在AndroidManifest.xml中声明了此活动？

任何建议或我还有其他事情要解决。

请帮助。谢谢

Answer 1

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