FLUTTER 错误：java.lang.RuntimeException：无法实例化应用程序

Question

我对这个裸露的东西很陌生。

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我正在 VS 中运行我的代码

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我正在尝试运行我的 FLUTTER 应用程序，但不断收到错误：

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Launching lib\\main.dart on TECNO LC6 in debug mode...\n\xe2\x9c\x93 Built build\\app\\outputs\\flutter-apk\\app-debug.apk.\nE/AndroidRuntime(32535): FATAL EXCEPTION: main\nE/AndroidRuntime(32535): Process: com.oneclick.errands, PID: 32535\nE/AndroidRuntime(32535): java.lang.RuntimeException: Unable to instantiate application com.oneclick.errands.Application: java.lang.ClassNotFoundException: Didn't find class "com.oneclick.errands.Application" on path: DexPathList[[zip file "/system/framework/org.apache.http.legacy.boot.jar", zip file "/data/app/com.oneclick.errands-9wup51WXGNuAJqp8P2doyw==/base.apk"],nativeLibraryDirectories=[/data/app/com.oneclick.errands-9wup51WXGNuAJqp8P2doyw==/lib/arm, /data/app/com.oneclick.errands-9wup51WXGNuAJqp8P2doyw==/base.apk!/lib/armeabi-v7a, /system/lib]]\nE/AndroidRuntime(32535): at android.app.LoadedApk.makeApplication(LoadedApk.java:1069)\nE/AndroidRuntime(32535): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5923)\nE/AndroidRuntime(32535): at android.app.ActivityThread.access$1200(ActivityThread.java:213)\nE/AndroidRuntime(32535): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1685)\nE/AndroidRuntime(32535): at android.os.Handler.dispatchMessage(Handler.java:106)\nE/AndroidRuntime(32535): at android.os.Looper.loop(Looper.java:193)\nE/AndroidRuntime(32535): at android.app.ActivityThread.main(ActivityThread.java:6758)\nE/AndroidRuntime(32535): at java.lang.reflect.Method.invoke(Native Method)\nE/AndroidRuntime(32535): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:497)\nE/AndroidRuntime(32535): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:912)\nE/AndroidRuntime(32535): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.oneclick.errands.Application"\non path: DexPathList[[zip file "/system/framework/org.apache.http.legacy.boot.jar", zip file "/data/app/com.oneclick.errands-9wup51WXGNuAJqp8P2doyw==/base.apk"],nativeLibraryDirectories=[/data/app/com.oneclick.errands-9wup51WXGNuAJqp8P2doyw==/lib/arm, /data/app/com.oneclick.errands-9wup51WXGNuAJqp8P2doyw==/base.apk!/lib/armeabi-v7a, /system/lib]]\nE/AndroidRuntime(32535): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134)\nE/AndroidRuntime(32535): at java.lang.ClassLoader.loadClass(ClassLoader.java:379)\nE/AndroidRuntime(32535): at java.lang.ClassLoader.loadClass(ClassLoader.java:312)\nE/AndroidRuntime(32535): at android.app.AppComponentFactory.instantiateApplication(AppComponentFactory.java:50)\nE/AndroidRuntime(32535): at androidx.core.app.CoreComponentFactory.instantiateApplication(CoreComponentFactory.java:52)\nE/AndroidRuntime(32535): at android.app.Instrumentation.newApplication(Instrumentation.java:1120)\nE/AndroidRuntime(32535): at android.app.LoadedApk.makeApplication(LoadedApk.java:1061)\nE/AndroidRuntime(32535): ... 9 more\n\n

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然后它挂在最后一步。我什至把它放了3个小时，我变得不耐烦了。我已尝试添加尽可能多的相关信息，但系统希望我添加更多信息，但我已经说过我不得不说。现在我只是打字来摆脱这个警告。

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！！！帮助！！！

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我的构建.gradle

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def localProperties = new Properties()\ndef localPropertiesFile = rootProject.file('local.properties')\nif (localPropertiesFile.exists()) {\n    localPropertiesFile.withReader('UTF-8') { reader ->\n        localProperties.load(reader)\n    }\n}\n\ndef flutterRoot = localProperties.getProperty('flutter.sdk')\nif (flutterRoot == null) {\n    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")\n}\n\ndef flutterVersionCode = localProperties.getProperty('flutter.versionCode')\nif (flutterVersionCode == null) {\n    flutterVersionCode = '2'\n}\n\ndef flutterVersionName = localProperties.getProperty('flutter.versionName')\nif (flutterVersionName == null) {\n    flutterVersionName = '3.15.0'\n}\n\napply plugin: 'com.android.application'\napply plugin: 'kotlin-android'\napply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"\n\ndef keystorePropertiesFile = rootProject.file("key.properties")\ndef keystoreProperties = new Properties()\nkeystoreProperties.load(new FileInputStream(keystorePropertiesFile))\n\nandroid {\n    compileSdkVersion 29\n\n    sourceSets {\n        main.java.srcDirs += 'src/main/kotlin'\n    }\n\n    lintOptions {\n        disable 'InvalidPackage'\n    }\n\n    defaultConfig {\n        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).\n        applicationId "com.oneclick.errands"\n        minSdkVersion 19\n        targetSdkVersion 29\n        versionCode flutterVersionCode.toInteger()\n        versionName flutterVersionName\n        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"\n\n        //Added to fix error <FirebaseCorePlugin.java uses unchecked or unsafe operations>\n        multiDexEnabled true\n    }\n\n    signingConfigs {\n        release {\n            keyAlias keystoreProperties['keyAlias']\n            keyPassword keystoreProperties['keyPassword']\n            storeFile file(keystoreProperties['storeFile'])\n            storePassword keystoreProperties['storePassword']\n        }\n    }\n\n    buildTypes {\n        release {\n            // TODO: Add your own signing config for the release build.\n            // Signing with the debug keys for now, so `flutter run --release` works.\n//            signingConfig signingConfigs.debug\n            signingConfig signingConfigs.release\n        }\n    }\n}\n\nflutter {\n    source '../..'\n}\n\ndependencies {\n    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"\n    implementation 'com.google.firebase:firebase-messaging:20.1.3'\n    implementation 'androidx.annotation:annotation:1.1.0'\n    implementation 'androidx.localbroadcastmanager:localbroadcastmanager:1.0.0'\n    testImplementation 'junit:junit:4.12'\n    androidTestImplementation 'androidx.test:runner:1.1.1'\n    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'\n\n    //Added to fix error <FirebaseCorePlugin.java uses unchecked or unsafe operations>\n    implementation 'com.android.support:multidex:1.0.3'\n}\n\napply plugin: 'com.google.gms.google-services'\n\n\n

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感谢您的时间。

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Answer 1

也许问题是因为项目结构中的 flutter/dart 配置导致 flutter 无法在启动时访问您的应用程序。也许您可以尝试在 AndroidManifest.xml 中使用默认的 Flutter 应用程序名称。见下图。

<application android:name="io.flutter.app.FlutterApplication" android:label="AppLabel">

AndroidManifest.xml