activity_basic_spinner.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context="com.godoro.androidbasics.BasicSpinnerActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="20dp"
        android:text="@string/selectFromSpinner"
        android:textAlignment="center"
        android:textStyle="bold" />

    <Spinner
        android:id="@+id/subjectSpinner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="20dp" />

    <Button
        android:id="@+id/processButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="20dp"
        android:text="@string/process"
        android:textAlignment="center"
        android:onClick="onClickItemSelect"/>

    <TextView
        android:id="@+id/selectedView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="20dp" />

</LinearLayout>