How to pass a value to the variable of android.view.View.OnClickListener in data binding in Android Studio?

The following code is from the project sunflower.

There is variable named clickListener, it's a variable of android.view.View.OnClickListener.

I don't know how to pass a value to the variable clickListener of android.view.View.OnClickListener in data binding in Android Studio, could you tell me?

And more, I can't understand that the code binding.setClickListener{...} in PlantAdapter.kt, could you tell me?

list_item_plant.xml

<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">

    <data>
        <variable
            name="clickListener"
            type="android.view.View.OnClickListener"/>
        ...
    </data>

    <com.google.samples.apps.sunflower.views.MaskedCardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"      
        android:onClick="@{clickListener}"
       
    ...
}

PlantAdapter.kt

class PlantAdapter : ListAdapter<Plant, RecyclerView.ViewHolder>(PlantDiffCallback()) {    
    ...
    class PlantViewHolder(
        private val binding: ListItemPlantBinding
    ) : RecyclerView.ViewHolder(binding.root) {
        init {
            binding.setClickListener {
                binding.plant?.let { plant ->
                    navigateToPlant(plant, it)
                }
            }
        }

     ...
}

Added content

Normally, I define a data binding variable name in plain_activity_solution_2.xml, I should assign a value for it such as binding.name = "Ada" in PlainOldActivitySolution2.kt.

So when I define a data binding variable clickListener in list_item_plant.xml, I should assign a value for it such as binding.clickListener=... in PlantAdapter.kt, But I can't find binding.clickListener=... in PlantAdapter.kt, instead I only find binding.setClickListener {...} , why?

plain_activity_solution_2.xml

<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">

    <data>    
        <variable
            name="name"
            type="String"/>    
    </data>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:id="@+id/plain_name"
            android:layout_width="0dp"
            android:layout_height="wrap_content"                
            android:text="@{name}"
     ...
}

PlainOldActivitySolution2.kt

class PlainOldActivitySolution2 : AppCompatActivity() {

    // Obtain ViewModel from ViewModelProviders
    private val viewModel by lazy { ViewModelProviders.of(this).get(SimpleViewModel::class.java) }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        val binding: PlainActivitySolution2Binding =
            DataBindingUtil.setContentView(this, R.layout.plain_activity_solution_2)

        binding.name = "Ada"
        binding.lastName = "Lovelace"
       
    }

    ...
}