Create a spinner dialog using Recycler view and Higher order function

SpinnerDialog.txt

# This is the Util function

````
import android.app.Dialog
import android.content.Context
import android.graphics.Color
import android.graphics.drawable.ColorDrawable
import android.view.LayoutInflater
import androidx.databinding.DataBindingUtil
import androidx.recyclerview.widget.RecyclerView
import com.sslwireless.alil.R
import com.sslwireless.alil.databinding.CustomSpinnerDialogBinding
import kotlinx.android.synthetic.main.custom_spinner_dialog.*

object D {

    inline fun showSpinnerDialog(context: Context, title : String, rv : (RecyclerView, Dialog) -> Unit ) {
        val newDialog = Dialog(context, R.style.customDialog)
        newDialog.requestWindowFeature(android.view.Window.FEATURE_NO_TITLE)
        newDialog.window!!.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))

        val customDialogBinding: CustomSpinnerDialogBinding = DataBindingUtil.inflate(
            LayoutInflater.from(context),
            R.layout.custom_spinner_dialog, null, false
        )

        newDialog.setContentView(customDialogBinding.root)

        rv(customDialogBinding.recyclerView2, newDialog)

        customDialogBinding.textView92.text = title

        customDialogBinding.done.setOnClickListener {

        }
        customDialogBinding.cancle.setOnClickListener {
            newDialog.dismiss()
        }

        newDialog.show()
        newDialog.setCancelable(false)
    }
}



````
# Calling from fragment or activity


````
tvPrefix.setOnClickListener {
        D.showSpinnerDialog(requireContext(), "Prefixes") { rv, dialog ->
            initPrefixRV(rv, dialog)
          }
      }

````

# Recycler view

````
  private fun initPrefixRV(rv: RecyclerView, dialog: Dialog) {
        val prefixes = arrayListOf("Mr.", "Mrs.")

        rv.layoutManager = LinearLayoutManager(requireContext())
        rv.adapter = BaseRecyclerAdapter(requireContext(), object:IAdapterListener{
            override fun <T> clickListener(position: Int, model: T, view: View) {

                tvPrefix.text = prefixes[position]
                dialog.dismiss()
            }

            override fun getViewHolder(parent: ViewGroup, viewType: Int): BaseViewHolder {
                return SpinnerAdapterRecycler(
                    DataBindingUtil.inflate(
                        LayoutInflater.from(parent.context)
                        , R.layout.custom_user_spinner
                        , parent, false
                    )
                    , requireContext(), "application_form_prefix"
                )
            }
        }, prefixes)
    }
````

# Spinner Adapter

````
import android.content.Context
import androidx.databinding.ViewDataBinding
import com.sslwireless.alil.databinding.CustomUserSpinnerBinding
import com.sslwireless.alil.view.base.BaseViewHolder

class SpinnerAdapterRecycler(
    itemView: ViewDataBinding,
    context: Context,
    private val type: String
) :
    BaseViewHolder(itemView.root) {

    var binding = itemView as CustomUserSpinnerBinding
    var mContext: Context = context

    override fun <T> onBind(
        position: Int,
        itemModel: T,
        listener: IAdapterListener
    ) {
        when (type) {
            
            "application_form_prefix" -> {
                itemModel as String

                binding.spinnerDataItem.text = itemModel

                binding.root.setOnClickListener {
                    listener.clickListener(position, itemModel, binding.root)
                }
            }
        }
    }
}
````

# Custom Spinner xml

````
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:tools="http://schemas.android.com/tools"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

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

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline7"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            app:layout_constraintGuide_begin="8dp" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline8"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            app:layout_constraintGuide_end="8dp" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline9"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_begin="6dp" />

        <com.sslwireless.alil.util.CustomTextView
            android:id="@+id/spinnerDataItem"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginEnd="16dp"
            android:gravity="center_vertical"
            android:maxLines="4"
            android:text="sadads"
            android:padding="6sp"
            android:background="?attr/selectableItemBackground"
            android:paddingEnd="55dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/imageView22"
            app:layout_constraintStart_toStartOf="@+id/guideline7"
            app:layout_constraintTop_toTopOf="@+id/guideline9" />

        <ImageView
            android:id="@+id/imageView22"
            android:layout_width="18dp"
            android:layout_height="18dp"
            android:layout_marginEnd="24dp"
            android:visibility="gone"
            android:tint="@color/colorPrimary"
            app:layout_constraintBottom_toBottomOf="@+id/spinnerDataItem"
            app:layout_constraintEnd_toStartOf="@+id/guideline8"
            app:layout_constraintTop_toTopOf="@+id/guideline9"
            android:src="@drawable/ic_tick" />

        <View
            android:id="@+id/view47"
            android:layout_width="0dp"
            android:layout_height="0.5dp"
            android:layout_marginTop="8dp"
            android:background="@color/divider_color"
            app:layout_constraintEnd_toStartOf="@+id/guideline8"
            app:layout_constraintStart_toStartOf="@+id/guideline7"
            app:layout_constraintTop_toBottomOf="@+id/spinnerDataItem" />

        <androidx.constraintlayout.widget.Group
            android:id="@+id/itemSelectGroup"
            android:layout_width="0dp"
            android:layout_height="0dp"
            app:constraint_referenced_ids="spinnerDataItem"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/guideline8"
            app:layout_constraintStart_toStartOf="@+id/spinnerDataItem"
            app:layout_constraintTop_toTopOf="@+id/guideline9" >
        </androidx.constraintlayout.widget.Group>

    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>

````