Passing a function with inputs as parameter

hdpe1399 · December 5, 2019, 10:30am

Hello guys, I’m very new to Kotlin (and fairly new to java) and was trying out making an abstract classes for my list adapters in my testing / studying android app, so I wouldn’t have to create one for every list.

Like this:

abstract class BaseRecyclerView {

    abstract class Adapter<ITEM : Any, B : ViewDataBinding>(
        private val listener : ((s : Any) -> View.OnClickListener)? = null,
        @LayoutRes private val layoutResId: Int,
        private val bindingVariableId: Int? = null
    ) : RecyclerView.Adapter<ViewHolder<B>>() {
    ...

The problen is with one of its parameter, a method that has a data class as a parameter and returns a View.OnClickListener.

Later, the listener method is used to set the onClickListener of a view

listener?.let { itemView.setOnClickListener(it(item as Any)) }

Then, in the main activity, I create&attach an instance of the adapter to a list

deprListView.adapter = object : BaseRecyclerView.Adapter<Station, StationListItemBinding>(
            listener = { s ->
                s as Station
                View.OnClickListener {
                    Toast.makeText(this@StationActivity, "${s.stationName} : ${s.stationCode}", Toast.LENGTH_SHORT).show()
                }
            },
            layoutResId = R.layout.station_list_item,
            bindingVariableId = BR.station
        ) {}

So what I explained worked well without the listener parameter, but with the listener parameter AndroidStudio outputs an error output like below on build.

Is this not the correct way to get a method as a parameter? If so what would be the right way to do so? Thanks for reading my long question ^^

e: java.lang.IllegalStateException: Backend Internal error: Exception during code generation
File being compiled at position: file://C:/Users/dev/Desktop/ExpressBus1/app/src/main/java/com/example/expressbus1/ui/station/StationActivity.kt
The root cause java.lang.AssertionError was thrown at: org.jetbrains.kotlin.codegen.inline.MethodInliner$doInline$lambdaInliner$1.visitMethodInsn(MethodInliner.kt:314)
	at org.jetbrains.kotlin.codegen.CompilationErrorHandler.lambda$static$0(CompilationErrorHandler.java:35)
	at org.jetbrains.kotlin.codegen.PackageCodegenImpl.generate(PackageCodegenImpl.java:76)
	at org.jetbrains.kotlin.codegen.DefaultCodegenFactory.generatePackage(CodegenFactory.kt:96)
	at org.jetbrains.kotlin.codegen.DefaultCodegenFactory.generateModule(CodegenFactory.kt:67)
	at org.jetbrains.kotlin.codegen.KotlinCodegenFacade.doGenerateFiles(KotlinCodegenFacade.java:47)
	at org.jetbrains.kotlin.codegen.KotlinCodegenFacade.compileCorrectFiles(KotlinCodegenFacade.java:39)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.generate(KotlinToJVMBytecodeCompiler.kt:637)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli(KotlinToJVMBytecodeCompiler.kt:195)
	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:165)
	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:55)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:84)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:42)
	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:104)
	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:349)
	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:105)
	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileIncrementally(IncrementalCompilerRunner.kt:237)
	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:88)
	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:606)
	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:99)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1645)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	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:357)
	at sun.rmi.transport.Transport$1.run(Transport.java:200)
	at sun.rmi.transport.Transport$1.run(Transport.java:197)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.AssertionError: <init> call doesn't correspond to object transformation info for 'com/example/expressbus1/ui/station/StationActivity$onCreate$1$1.<init>': null
	at org.jetbrains.kotlin.codegen.inline.MethodInliner$doInline$lambdaInliner$1.visitMethodInsn(MethodInliner.kt:314)
	at org.jetbrains.org.objectweb.asm.tree.MethodInsnNode.accept(MethodInsnNode.java:117)
	at org.jetbrains.org.objectweb.asm.tree.InsnList.accept(InsnList.java:144)
	at org.jetbrains.org.objectweb.asm.tree.MethodNode.accept(MethodNode.java:792)
	at org.jetbrains.kotlin.codegen.inline.MethodInliner.doInline(MethodInliner.kt:389)
	at org.jetbrains.kotlin.codegen.inline.MethodInliner.doInline(MethodInliner.kt:97)
	at org.jetbrains.kotlin.codegen.inline.MethodInliner.access$doInline(MethodInliner.kt:43)
	at org.jetbrains.kotlin.codegen.inline.MethodInliner$doInline$lambdaInliner$1.visitMethodInsn(MethodInliner.kt:301)
	at org.jetbrains.org.objectweb.asm.tree.MethodInsnNode.accept(MethodInsnNode.java:117)
	at org.jetbrains.org.objectweb.asm.tree.InsnList.accept(InsnList.java:144)
	at org.jetbrains.org.objectweb.asm.tree.MethodNode.accept(MethodNode.java:792)
	at org.jetbrains.kotlin.codegen.inline.MethodInliner.doInline(MethodInliner.kt:389)
	at org.jetbrains.kotlin.codegen.inline.MethodInliner.doInline(MethodInliner.kt:97)
	at org.jetbrains.kotlin.codegen.inline.MethodInliner.doInline(MethodInliner.kt:70)
	at org.jetbrains.kotlin.codegen.inline.InlineCodegen.inlineCall(InlineCodegen.kt:261)
	at org.jetbrains.kotlin.codegen.inline.InlineCodegen.performInline(InlineCodegen.kt:142)
	at org.jetbrains.kotlin.codegen.inline.PsiInlineCodegen.genCallInner(PsiInlineCodegen.kt:67)
	at org.jetbrains.kotlin.codegen.CallGenerator$DefaultImpls.genCall(CallGenerator.kt:115)
	at org.jetbrains.kotlin.codegen.inline.PsiInlineCodegen.genCall(PsiInlineCodegen.kt:31)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.invokeMethodWithArguments(ExpressionCodegen.java:2533)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.invokeMethodWithArguments(ExpressionCodegen.java:2476)
	at org.jetbrains.kotlin.codegen.Callable$invokeMethodWithArguments$1.invoke(Callable.kt:41)
	at org.jetbrains.kotlin.codegen.Callable$invokeMethodWithArguments$1.invoke(Callable.kt:13)
	at org.jetbrains.kotlin.codegen.OperationStackValue.putSelector(StackValue.kt:79)
	at org.jetbrains.kotlin.codegen.StackValueWithLeaveTask.putSelector(StackValue.kt:67)
	at org.jetbrains.kotlin.codegen.StackValue.put(StackValue.java:122)
	at org.jetbrains.kotlin.codegen.StackValue.put(StackValue.java:115)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.putStackValue(ExpressionCodegen.java:384)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.gen(ExpressionCodegen.java:365)
	at org.jetbrains.kotlin.codegen.ExpressionCodegen.returnExpression(ExpressionCodegen.java:1701)
	at org.jetbrains.kotlin.codegen.FunctionGenerationStrategy$FunctionDefault.doGenerateBody(FunctionGenerationStrategy.java:64)
	at org.jetbrains.kotlin.codegen.FunctionGenerationStrategy$CodegenBased.generateBody(FunctionGenerationStrategy.java:84)
	at org.jetbrains.kotlin.codegen.FunctionCodegen.generateMethodBody(FunctionCodegen.java:666)
	at org.jetbrains.kotlin.codegen.FunctionCodegen.generateMethodBody(FunctionCodegen.java:473)
	at org.jetbrains.kotlin.codegen.FunctionCodegen.generateMethod(FunctionCodegen.java:260)
	at org.jetbrains.kotlin.codegen.FunctionCodegen.generateMethod(FunctionCodegen.java:176)
	at org.jetbrains.kotlin.codegen.FunctionCodegen.gen(FunctionCodegen.java:147)
	at org.jetbrains.kotlin.codegen.MemberCodegen.genSimpleMember(MemberCodegen.java:197)
	at org.jetbrains.kotlin.codegen.ClassBodyCodegen.generateDeclaration(ClassBodyCodegen.java:166)
	at org.jetbrains.kotlin.codegen.ClassBodyCodegen.generateBody(ClassBodyCodegen.java:86)
	at org.jetbrains.kotlin.codegen.MemberCodegen.generate(MemberCodegen.java:129)
	at org.jetbrains.kotlin.codegen.MemberCodegen.genClassOrObject(MemberCodegen.java:302)
	at org.jetbrains.kotlin.codegen.MemberCodegen.genClassOrObject(MemberCodegen.java:286)
	at org.jetbrains.kotlin.codegen.PackageCodegenImpl.generateClassesAndObjectsInFile(PackageCodegenImpl.java:118)
	at org.jetbrains.kotlin.codegen.PackageCodegenImpl.generateFile(PackageCodegenImpl.java:137)
	at org.jetbrains.kotlin.codegen.PackageCodegenImpl.generate(PackageCodegenImpl.java:68)
	... 35 more

Wasabi375 · December 5, 2019, 1:45pm

From what I can tell you did everything right. I don’t know android so I can’t tell you if there are better ways to sovle your problem.
The error you get however looks like a bug in the kotlin compiler. You should never see a “Backend Internal error”.
What version of kotlin are you using? If it’s not the latests(1.3.61) upgrade and try again. If you still get the same error you should create an issue here(https://kotl.in/issue) so that it can be fixed.

hdpe1399 · December 5, 2019, 2:14pm

Thank you for the answer, I’m currently using kotlin plugin 1.3.61-release-Studio3.5-1, which is the latest version, so I think it may-be a bug converting kotlin to java?

Wasabi375 · December 5, 2019, 2:23pm

Kotlin isn’t converted to java. It’s compiled to JVM bytecode. But AFAICT it’s still a bug in kotlin and not with your code so you should create the issue (and post it here)

Alexey.Belkov · December 13, 2019, 2:03pm

For reference, the issue is https://youtrack.jetbrains.com/issue/KT-35301

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Passing a function with inputs as parameter

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