Two-way Layout Databinding for start and end

[mcanyucel]

Instead of using the callback functions to get the new values, I tried to data-bind them to my view model. When the data-binding is one way, the control can get the value from the view-model without any issues:

<?xml version="1.0" encoding="utf-8"?>
<layout 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"
    tools:context=".MainActivity">
    <data>
        <variable
            name="mainViewModel"
            type="com.bridgewiz.laserdotdetection.viewmodel.MainViewModel" />
    </data>

    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <me.bendik.simplerangeview.SimpleRangeView
            android:id="@+id/fixed_rangeview"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal|top"
            app:count="180"
            app:start="@{mainViewModel.hueMin}"
            app:end="@{mainViewModel.hueMax}"
            app:minDistance="20" />
    </androidx.coordinatorlayout.widget.CoordinatorLayout>
</layout>

Viewmodel:

...
    val hueMin= MutableLiveData(5)
    val hueMax= MutableLiveData(160)
...

Of course in this case the changes by user are not reflected to viewmodel. Therefore when if I change the binding to two-way then the compilation fails:

            app:start="@={mainViewModel.hueMin}"

Cannot find a getter for <me.bendik.simplerangeview.SimpleRangeView app:start> that accepts parameter type 'java.lang.Integer'
If a binding adapter provides the getter, check that the adapter is annotated correctly and that the parameter type matches.

Do I need a custom adapter for this? If I need one, I don't get how to write the adapter because it seems to me like the type Int is correct and there is nothing to adapt for the adapter.