我知道这已经被问过了，但是我的问题很奇怪，我找不到答案。
我有一个父类，其中一个成员被声明为受保护的
class BaseContoller<G: BaseContract.BasePresenter,F: BaseModel> {
protected var presenter: G? = null
// ...
}
在BaseController的每个子孙中，我毫无疑问地引用presenter，因为它可以在相同的包和子类中访问。
一个BaseController的后代也必须被其他类扩展，但是在再次引用presenter的位置执行某些操作之前，我必须做一个检查
class BackupPrinterController<G: BackupPrinterContract.Presenter,F: BaseModel>: BackupController<G,F>
private fun startScan() {
if(this is PrinterAssociationController) {
PrinterConnection.onConnection = { presenter?.onDeviceConnected(it) }
// ...
}
}
}
这里出现了奇怪的行为，presenter仅在没有过滤器if(this is PrinterAssociationController)的情况下才能完全访问，并带有该if语句，当调用onConnection回调时，一个{{ 1}}由IllegalaccessError
这是PrinterAssociationController的声明
presenter这是个例外
class PrinterAssociationController: BackupPrinterController<PrinterAssociationContract.Presenter,PrinterAssociationmodel>(),PrinterAssociationContract.View
我不明白为什么在我输入java.lang.IllegalaccessError: Method 'package.common.base.BaseContract$BasePresenter package.common.base.BaseController.getPresenter()' is inaccessible to class 'package.project.features.shared.controllers.BackupPrinterController$startScan$1' (declaration of 'package.project.features.shared.controllers.BackupPrinterController$startScan$1' appears in /data/app/package.project-1/base.apk:classes2.dex)
at package.project.features.shared.controllers.BackupPrinterController$startScan$1.invoke(BackupPrinterController.kt:53)
at package.project.features.shared.controllers.BackupPrinterController$startScan$1.invoke(BackupPrinterController.kt:35)
at package.project.utils.print.PrinterConnection$scan$1$4.accept(PrinterConnection.kt:84)
at package.project.utils.print.PrinterConnection$scan$1$4.accept(PrinterConnection.kt:24)
at io.reactivex.internal.observers.LambdaObserver.onNext(LambdaObserver.java:63)
at io.reactivex.internal.operators.observable.ObservableFilter$FilterObserver.onNext(ObservableFilter.java:52)
at io.reactivex.internal.operators.observable.ObservableDistinct$DistinctObserver.onNext(ObservableDistinct.java:85)
at io.reactivex.internal.operators.mixed.CompletableAndThenObservable$AndThenObservableObserver.onNext(CompletableAndThenObservable.java:65)
at io.reactivex.internal.operators.observable.ObservableflatMap$MergeObserver.tryEmit(ObservableflatMap.java:265)
at io.reactivex.internal.operators.observable.ObservableflatMap$InnerObserver.onNext(ObservableflatMap.java:562)
at io.reactivex.internal.operators.observable.ObservableDoOnEach$DoOnEachObserver.onNext(ObservableDoOnEach.java:101)
at io.reactivex.internal.operators.observable.ObservableMap$MapObserver.onNext(ObservableMap.java:62)
at io.reactivex.internal.operators.observable.ObservableUnsubscribeon$UnsubscribeObserver.onNext(ObservableUnsubscribeon.java:60)
at io.reactivex.internal.operators.observable.ObservableCreate$CreateEmitter.onNext(ObservableCreate.java:66)
at com.polidea.rxandroidble2.internal.serialization.FIFORunnableEntry$1.onNext(FIFORunnableEntry.java:66)
at io.reactivex.internal.operators.observable.ObservableUnsubscribeon$UnsubscribeObserver.onNext(ObservableUnsubscribeon.java:60)
at io.reactivex.internal.operators.observable.ObservableSubscribeon$SubscribeonObserver.onNext(ObservableSubscribeon.java:58)
at io.reactivex.internal.operators.observable.ObservableCreate$CreateEmitter.onNext(ObservableCreate.java:66)
at com.polidea.rxandroidble2.internal.operations.ScanOperationApi21$1.onScanResult(ScanOperationApi21.java:77)
at android.bluetooth.le.BluetoothLeScanner$BleScanCallbackWrapper$1.run(BluetoothLeScanner.java:471)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at com.osama.firecrasher.FireLooper.run(FireLooper.kt:39)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.activityThread.main(activityThread.java:6780)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1500)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1390)
语句时会发生这种情况