onNextClicked method from BlockingStep is not called.

[VijaiGunasekar]

I am working in kotlin. So please ignore the syntax. Just consider the logic and help me out. Thanks in advance

class StepperActivity() : AppCompatActivity(), StepperLayout.StepperListener {

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.stepper_layout)

    val stepperLayout = findViewById<StepperLayout>(R.id.stepperLayout)
    stepperLayout.adapter = StepperAdapter(supportFragmentManager, this)
    stepperLayout.setListener(this)
    stepperLayout.currentStepPosition = intent.getIntExtra(MainActivity.POSITION, 2)
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
    menuInflater.inflate(R.menu.menu_stepper, menu)
    return true
}
override fun onStepSelected(newStepPosition: Int) { }
override fun onError(verificationError: VerificationError?) {}
override fun onReturn() {}
override fun onCompleted(completeButton: View?) { }

}

class StepperAdapter(fm: FragmentManager, context: Context): AbstractFragmentStepAdapter(fm, context){ override fun getCount() = 3

override fun createStep(position: Int): Step {
    when(position){
        0 -> return CreateFrag()
        1 -> return FilterFrag()
        else -> return PublishFrag()
    }
}

override fun getViewModel(position: Int): StepViewModel {
    when(position){
        0 -> return StepViewModel.Builder(context).setTitle("Create").create()
        1 -> return StepViewModel.Builder(context).setTitle("Filter").create()
        else -> return StepViewModel.Builder(context).setTitle("Publish").create()
    }
}

}

class CreateFrag: Fragment(), BlockingStep {

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    val view = inflater.inflate(R.layout.target_create, container, false)
    view.saveExitCreate.background = getGradientDrawable(Color.rgb(42,208,147), Color.WHITE)
    return view
}

private fun getGradientDrawable(borderColor: Int, bgColor: Int = Color.rgb(242,244,247)): GradientDrawable {
    return GradientDrawable().apply {
        color = ColorStateList.valueOf(bgColor)
        cornerRadius = 20f
        setStroke(4, borderColor)
    }
}

override fun onBackClicked(callback: StepperLayout.OnBackClickedCallback?) {
    callback?.goToPrevStep()
}

override fun onSelected() { }

override fun onCompleteClicked(callback: StepperLayout.OnCompleteClickedCallback?) {
    callback?.complete()
}

override fun onNextClicked(callback: StepperLayout.OnNextClickedCallback?) {
    Toast.makeText(context, "Next Clicked", Toast.LENGTH_SHORT).show()
    callback?.goToNextStep()
}

override fun verifyStep(): VerificationError = VerificationError("")

override fun onError(error: VerificationError) { }

}

<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".StepperActivity">

<com.stepstone.stepper.StepperLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/stepperLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:ms_showBackButtonOnFirstStep="true"
    app:ms_nextButtonColor="#FFFFFF"
    app:ms_backButtonColor="#FFFFFF"
    app:ms_completeButtonText=""
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    app:ms_stepperType="tabs" />

</android.support.constraint.ConstraintLayout>