Как правильно сделать обработку событий с привязкой данных

Question

как указано выше, я пытаюсь сделать рабочую обработку событий для нескольких кнопок, используя привязку данных (точные ссылки на методы), но, похоже, не могу заставить ее работать.Похоже, что слушатель onCLick не может найти указанный метод.Не уверен, почему это происходит.Вот соответствующие фрагменты кода и ошибка, которую я продолжаю получать:

Основная активность:

class MainActivity : AppCompatActivity(), EntryScreenFragment.FragInterface, ImageChoiceFragment.FragInterface,
        AccelerometerDisplayFragment.FragInterface, JSONPostChooserFragment.FragInterface {
    companion object {
        const val MY_REQUEST_CODE_1 = 24215
        const val MY_REQUEST_CODE_2 = 31345
    }

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    setSupportActionBar(findViewById(R.id.my_toolbar))

    val fragment = EntryScreenFragment()
    fragment.listener = this

    addNewFragment(fragment)

    supportActionBar?.setHomeAsUpIndicator(R.mipmap.ic_launcher_round)
    supportActionBar?.setHomeButtonEnabled(true)
    supportActionBar?.setDisplayHomeAsUpEnabled(true)
}

override fun screenshotAccelerometer(): Boolean {
    if (isExternalStorageWritable()) checkAndAskForPermissionToWrite()
    return true
}

override fun imageChoiceButtonclick1(input: String) {
    val fragment = ImageDisplayFragment.newInstanceWithText(getString(R.string.url_1), input)
    addNewFragment(fragment)
}

override fun imageChoiceButtonclick2(input: String) {
    val fragment = ImageDisplayFragment.newInstanceWithText(getString(R.string.url_2), input)
    addNewFragment(fragment)
}

override fun imageChoiceButtonclick3(input: String) {
    val fragment = ImageDisplayFragment.newInstanceWithText(getString(R.string.url_3), input)
    addNewFragment(fragment)
}

override fun entryScreenButtonClickImages() {
    val fragment = ImageChoiceFragment()
    fragment.listener = this
    addNewFragment(fragment)
}

override fun entryScreenButtonClickAccelerometer() {
    val fragment = AccelerometerDisplayFragment()
    fragment.listener = this
    addNewFragment(fragment)
}

override fun entryScreenButtonClickJSON() {
    //   val fragment=JSONLoaderFragment()
    val fragment = JSONPostChooserFragment()
    fragment.listener = this
    addNewFragment(fragment)
}

override fun entryScreenButtonClickNoXML() {
    val fragment = NoXMLFragment()
    addNewFragment(fragment)
}

override fun entryScreenButtonClickCheckForInternet() {
    return checkAndAskForPemissionToAccessNetworkState()
}

override fun entryScreenButtonClickImageBind() {
    val fragment =ImageBindFragment()
    addNewFragment(fragment)
}

override fun onCreateOptionsMenu(menu: Menu): Boolean {
    menuInflater.inflate(R.menu.test_menu, menu)
    return true
}

override fun onOptionsItemSelected(item: MenuItem?): Boolean {
    when (item?.itemId) {
        android.R.id.home -> {
            val mgr = supportFragmentManager
            if (!mgr.popBackStackImmediate())
                finish()

        }
        R.id.action_settings -> {

        }
        else -> {

        }
    }
    return super.onOptionsItemSelected(item)
}

override fun createChosenPostFragment(data: PostEntity) {
    val fragment = ChosenJSONPostFragment.newInstance(data)
    addNewFragment(fragment)

}

override fun onStart() {
    super.onStart()
}

override fun onResume() {
    super.onResume()
}

override fun onPause() {
    super.onPause()
}

fun addNewFragment(f: Fragment) {
    val transaction = supportFragmentManager.beginTransaction()
    transaction.setCustomAnimations(R.anim.anim_entry_1, R.anim.anim_exit_1, R.anim.anim_entry_1, R.anim.anim_exit_1)
    transaction.add(R.id.fragment_container, f).addToBackStack(UUID.randomUUID().toString()) //potential error
    transaction.commit()
}

private fun checkAndAskForPermissionToWrite() {
    if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED) {

        ActivityCompat.requestPermissions(this,
                arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE), MY_REQUEST_CODE_1)
    } else {
        if (isExternalStorageWritable())
            return

    }
}

private fun checkAndAskForPemissionToAccessNetworkState() {
    if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_NETWORK_STATE)
            != PackageManager.PERMISSION_GRANTED) {

        ActivityCompat.requestPermissions(this,
                arrayOf(Manifest.permission.ACCESS_NETWORK_STATE), MY_REQUEST_CODE_2)
    } else {
        //what to do with permission
        openWifi()
    }
    return
}

override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
    when (requestCode) {
        MY_REQUEST_CODE_1 -> {
            if ((grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED)) {
                //what to do with permission
                if (isExternalStorageWritable())
                    return
            }
        }

        MY_REQUEST_CODE_2 -> {
            if ((grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED)) {
                openWifi()
            }
        }
        else -> {
            //...
            Toast.makeText(this, "Permission not granted", Toast.LENGTH_LONG).show()
        }
    }
}

fun openWifi() {
    if (isNetworkAvailable())
    else {
        val bar = Snackbar.make(findViewById(R.id.EntryScreenCoordinatorLayout), getString(R.string.internet_check_snackbar_text), Snackbar.LENGTH_LONG)
        bar.show()
        bar.setAction(getString(R.string.internet_check_snackbar_action)) { startActivity(Intent(Settings.ACTION_WIFI_SETTINGS)) }
    }
}

private fun isNetworkAvailable(): Boolean {
    val cm = this.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
    val activeNetwork: NetworkInfo? = cm.activeNetworkInfo
    return activeNetwork?.isConnectedOrConnecting == true
}

fun isExternalStorageWritable(): Boolean {
    return Environment.getExternalStorageState() == Environment.MEDIA_MOUNTED
}

} Фрагмент:

class EntryScreenFragment : Fragment() {
    interface FragInterface {
        fun entryScreenButtonClickImages()
        fun entryScreenButtonClickAccelerometer()
        fun entryScreenButtonClickJSON()
        fun entryScreenButtonClickNoXML()
        fun entryScreenButtonClickCheckForInternet()
        fun entryScreenButtonClickImageBind()
    }

var listener: FragInterface? = null
lateinit var binding: FragmentEntryScreenBinding
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    binding=DataBindingUtil.inflate(inflater,R.layout.fragment_entry_screen,container,false)
    binding.handlers= EntryScreenEventHandlers()
    binding.handlers.listener=listener
    binding.root.isClickable=true
    return binding.root


}

} XML-фрагмент:

<layout>

<data>

    <variable
        name="handlers"
        type="com.example.robert.testapp.EntryScreenEventHandlers" />
</data>

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/EntryScreenCoordinatorLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorWhite"
    android:orientation="vertical">

    <Button
        android:id="@+id/EntryScreenButtonToImages"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|start"
        android:onClick="@{handlers::entryScreenButtonClickImages}"
        android:text="Make Fragment"
        app:layout_behavior="com.example.robert.testapp.ButtonSnackbarBehaviour" />

    <Button
        android:id="@+id/EntryScreenAccelerometerButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:onClick="@{handlers::entryScreenButtonClickAccelerometer}"
        android:text="Accelerometer screen"
        app:layout_behavior="com.example.robert.testapp.ButtonSnackbarBehaviour" />

    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <Button
            android:id="@+id/EntryScreenButtonToJSONLoader"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="@{handlers::entryScreenButtonClickJSON}"
            android:text="@string/entry_screen_load_json_button"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toRightOf="@id/EntryScreenButtonToNoXmlFragment"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <Button
            android:id="@+id/EntryScreenButtonToNoXmlFragment"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="@{handlers::entryScreenButtonClickNoXML"
            android:text="@string/entry_screen_to_no_xml_button"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toLeftOf="@id/EntryScreenButtonToJSONLoader"
            app:layout_constraintTop_toTopOf="parent" />

        <Button
            android:id="@+id/EntryScreenButtonInternetCheck"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="@{handlers::entryScreenButtonClickCheckForInternet"
            android:text="@string/entry_screen_internet_check_button"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <Button
            android:id="@+id/EntryScreenButtonImageBind"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="@{handlers::entryScreenButtonClickImageBind"
            android:text="@string/entry_screen_image_bind_button"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    </android.support.constraint.ConstraintLayout>

</android.support.design.widget.CoordinatorLayout>

Класс обработки событий:

class EntryScreenEventHandlers {
    var listener : EntryScreenFragment.FragInterface? = null
    fun entryScreenButtonClickImages(){listener?.entryScreenButtonClickImageBind()}
    fun entryScreenButtonClickAccelerometer(){listener?.entryScreenButtonClickAccelerometer()}
    fun entryScreenButtonClickJSON(){listener?.entryScreenButtonClickJSON()}
    fun entryScreenButtonClickNoXML(){listener?.entryScreenButtonClickNoXML()}
    fun entryScreenButtonClickCheckForInternet(){listener?.entryScreenButtonClickCheckForInternet()}
    fun entryScreenButtonClickImageBind() {listener?.entryScreenButtonClickImageBind()}

}

и, наконец, сообщение об ошибке:

[kapt] An exception occurred: android.databinding.tool.util.LoggedErrorException: Found data binding errors.
****/ data binding error ****msg:Listener class android.view.View.OnClickListener with method onClick did not match signature of any method handlers::entryScreenButtonClickImages
file:C:\Users\Robert\Desktop\AP_projects\app\src\main\res\layout\fragment_entry_screen.xml
loc:22:31 - 22:68
****\ data binding error ****

at android.databinding.tool.processing.Scope.assertNoError(Scope.java:112)
at android.databinding.annotationprocessor.ProcessDataBinding.doProcess(ProcessDataBinding.java:101)
at android.databinding.annotationprocessor.ProcessDataBinding.process(ProcessDataBinding.java:65)
at org.jetbrains.kotlin.kapt3.ProcessorWrapper.process(annotationProcessing.kt:133)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:794)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$200(JavacProcessingEnvironment.java:91)
at com.sun.tools.javac.processing.JavacProcessingEnvironment$DiscoveredProcessors$ProcessorStateIterator.runContributingProcs(JavacProcessingEnvironment.java:627)
at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1033)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1198)
at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)
at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1068)
at org.jetbrains.kotlin.kapt3.AnnotationProcessingKt.doAnnotationProcessing(annotationProcessing.kt:89)
at org.jetbrains.kotlin.kapt3.AnnotationProcessingKt.doAnnotationProcessing$default(annotationProcessing.kt:46)
at org.jetbrains.kotlin.kapt3.AbstractKapt3Extension.runAnnotationProcessing(Kapt3Extension.kt:226)
at org.jetbrains.kotlin.kapt3.AbstractKapt3Extension.analysisCompleted(Kapt3Extension.kt:181)
at org.jetbrains.kotlin.kapt3.ClasspathBasedKapt3Extension.analysisCompleted(Kapt3Extension.kt:93)
at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM$analyzeFilesWithJavaIntegration$2.invoke(TopDownAnalyzerFacadeForJVM.kt:97)
at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration(TopDownAnalyzerFacadeForJVM.kt:107)
at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration$default(TopDownAnalyzerFacadeForJVM.kt:84)
at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:374)
at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:64)
at org.jetbrains.kotlin.cli.common.messages.AnalyzerWithCompilerReport.analyzeAndReport(AnalyzerWithCompilerReport.kt:101)
at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.analyze(KotlinToJVMBytecodeCompiler.kt:365)
at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli(KotlinToJVMBytecodeCompiler.kt:130)
at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:161)
at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:63)
at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.java:108)
at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.java:52)
at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:92)
at org.jetbrains.kotlin.daemon.CompileServiceImpl$compile$1$1$2.invoke(CompileServiceImpl.kt:395)
at org.jetbrains.kotlin.daemon.CompileServiceImpl$compile$1$1$2.invoke(CompileServiceImpl.kt:97)
at org.jetbrains.kotlin.daemon.CompileServiceImpl$doCompile$$inlined$ifAlive$lambda$2.invoke(CompileServiceImpl.kt:909)
at org.jetbrains.kotlin.daemon.CompileServiceImpl$doCompile$$inlined$ifAlive$lambda$2.invoke(CompileServiceImpl.kt:97)
at org.jetbrains.kotlin.daemon.common.DummyProfiler.withMeasure(PerfUtils.kt:137)
at org.jetbrains.kotlin.daemon.CompileServiceImpl.checkedCompile(CompileServiceImpl.kt:939)
at org.jetbrains.kotlin.daemon.CompileServiceImpl.doCompile(CompileServiceImpl.kt:908)
at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:394)
at sun.reflect.GeneratedMethodAccessor105.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)