Example of an XML layout using MaterialSpinner

example_spinner.xml

<?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">

    <data>
        <import type="com.google.android.material.textfield.TextInputLayout" />

        <variable
            name="viewModel"
            type="com.example.SpinnerViewModel" />

    </data>
  
  <FrameLayout
    android:id="@+id/wrapper"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
  
    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/input_layout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="@string/selection_hint"
        app:startIconDrawable="@drawable/selection_icon"
        app:boxBackgroundMode="outline"
        app:endIconMode="@{viewModel.items == null || viewModel.items.size() != 0 ? TextInputLayout.END_ICON_DROPDOWN_MENU : TextInputLayout.END_ICON_NONE}">

        <com.example.MaterialSpinner
            android:id="@+id/items"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:items="@{viewModel.items}"
            app:selectedPosition="@={viewModel.selectedItemPosition}"
            app:emptyText="@string/selection_no_item_text" />

    </com.google.android.material.textfield.TextInputLayout>
    
  </FrameLayout>