Challenge 1: A LinearLayout Form — Solution

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp">

    <TextView
        android:id="@+id/nameLabel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Your name:" />

    <EditText
        android:id="@+id/nameInput"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textPersonName"
        android:hint="Enter your name" />

    <Button
        android:id="@+id/submitButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Submit" />

</LinearLayout>

Notes:
- orientation="vertical" stacks the three Views top to bottom, in the
  order they're declared — LinearLayout's children always render in
  document order along its orientation axis.
- The TextView and Button use wrap_content for both dimensions (only as
  big as their text needs); the EditText uses match_parent width so the
  input field spans the full available width, which is the normal
  pattern for a text field in a form.
- inputType="textPersonName" hints to Android which keyboard layout and
  autocapitalization behavior to use — a name field capitalizes each
  word automatically, unlike a plain "text" inputType.