activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".MainActivity">

    <androidx.appcompat.widget.LinearLayoutCompat
        android:id="@+id/llForm"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clipToPadding="false"
        android:orientation="vertical"
        android:padding="16dp"
        app:divider="@drawable/divider_md"
        app:showDividers="middle">

        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/tilUsername"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/username_required">

            <com.google.android.material.textfield.TextInputEditText
                android:id="@+id/etUsername"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:imeOptions="actionNext"
                android:inputType="text" />
        </com.google.android.material.textfield.TextInputLayout>

        <com.google.android.material.button.MaterialButton
            android:id="@+id/btnSubmit"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/submit" />
    </androidx.appcompat.widget.LinearLayoutCompat>
</androidx.constraintlayout.widget.ConstraintLayout>