错误：com.app.android.dagger.component.AppComponent（unscoped）可能不引用作用域绑定：

嗨我在我的android应用程序中使用dagger2。 我有提供ConnectivityManager AppModule和AppComponent。

AppModule.kt

 @Module class AppModule(private val application: Application) { @Provides @Singleton fun providesApplication(): Application = application @Provides @Singleton fun providesConnectivityManager(): ConnectivityManager = application.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager } 

AppComponent.kt

 @Component(modules = arrayOf(AppModule::class)) interface AppComponent { fun inject(app: ApprApplication) } 

在我的应用程序类中，我正在注入ConnectivityManager但是当我正在进行日志记录时，它的值为null。

 class AppApplication : Application(), AnkoLogger { private val appComponent: AppComponent by lazy { DaggerAppComponent.builder().appModule(AppModule(this)).build() } lateinit @Inject var cm: ConnectivityManager override fun onCreate() { super.onCreate() appComponent.inject(this) info { "connectivity manager ${cm}" } } } 

堆栈跟踪：

 $ gradlew build > Configure project :app NDK is missing a "platforms" directory. If you are using NDK, verify the ndk.dir is set to a valid NDK directory. It is currently set to C:\android-ndk-r15. If you are not using NDK, unset the NDK variable from ANDROID_NDK_HOME or local.properties to remove this warning. > Task :app:kaptGenerateStubsDebugKotlin Using kotlin incremental compilation e: D:\android\appandroid\app\app\build\tmp\kapt3\stubs\debug\com\app\android\dagger\component\AppComponent.java:4: error: com.app.android.dagger.component.AppComponent (unscoped) may not reference scoped bindings: e: e: @dagger.Component(modules = {com.app.android.dagger.module.AppModule.class}) e: ^ e: @org.jetbrains.annotations.NotNull @Singleton @Provides android.net.ConnectivityManager com.app.android.dagger.module.AppModule.providesConnectivityManager() e: java.lang.IllegalStateException: failed to analyze: org.jetbrains.kotlin.kapt3.diagnostic.KaptError: Error while annotation processing at org.jetbrains.kotlin.analyzer.AnalysisResult.throwIfError(AnalysisResult.kt:57) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules(KotlinToJVMBytecodeCompiler.kt:138) at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:170) at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:58) at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.java:93) at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.java:46) at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:92) at org.jetbrains.kotlin.daemon.CompileServiceImpl$compile$1$2.invoke(CompileServiceImpl.kt:386) at org.jetbrains.kotlin.daemon.CompileServiceImpl$compile$1$2.invoke(CompileServiceImpl.kt:98) at org.jetbrains.kotlin.daemon.CompileServiceImpl$doCompile$$inlined$ifAlive$lambda$2.invoke(CompileServiceImpl.kt:832) at org.jetbrains.kotlin.daemon.CompileServiceImpl$doCompile$$inlined$ifAlive$lambda$2.invoke(CompileServiceImpl.kt:98) at org.jetbrains.kotlin.daemon.common.DummyProfiler.withMeasure(PerfUtils.kt:137) at org.jetbrains.kotlin.daemon.CompileServiceImpl.checkedCompile(CompileServiceImpl.kt:859) at org.jetbrains.kotlin.daemon.CompileServiceImpl.doCompile(CompileServiceImpl.kt:831) at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:385) at sun.reflect.GeneratedMethodAccessor80.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:346) at sun.rmi.transport.Transport$1.run(Transport.java:200) at sun.rmi.transport.Transport$1.run(Transport.java:197) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:196) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: org.jetbrains.kotlin.kapt3.diagnostic.KaptError: Error while annotation processing at org.jetbrains.kotlin.kapt3.AnnotationProcessingKt.doAnnotationProcessing(annotationProcessing.kt:90) at org.jetbrains.kotlin.kapt3.AnnotationProcessingKt.doAnnotationProcessing$default(annotationProcessing.kt:42) at org.jetbrains.kotlin.kapt3.AbstractKapt3Extension.runAnnotationProcessing(Kapt3Extension.kt:205) at org.jetbrains.kotlin.kapt3.AbstractKapt3Extension.analysisCompleted(Kapt3Extension.kt:166) at org.jetbrains.kotlin.kapt3.ClasspathBasedKapt3Extension.analysisCompleted(Kapt3Extension.kt:82) at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM$analyzeFilesWithJavaIntegration$2.invoke(TopDownAnalyzerFacadeForJVM.kt:96) at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration(TopDownAnalyzerFacadeForJVM.kt:106) at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration$default(TopDownAnalyzerFacadeForJVM.kt:83) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:377) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:68) at org.jetbrains.kotlin.cli.common.messages.AnalyzerWithCompilerReport.analyzeAndReport(AnalyzerWithCompilerReport.kt:96) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.analyze(KotlinToJVMBytecodeCompiler.kt:368) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules(KotlinToJVMBytecodeCompiler.kt:133) ... 29 more FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':app:kaptDebugKotlin'. > Internal compiler error. See log for more details * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. * Get more help at https://help.gradle.org BUILD FAILED in 7s 13 actionable tasks: 2 executed, 11 up-to-date 

当我从providesConnectivityManager中删除@Singleton ，它运行良好。 有谁知道这是什么问题？