activity_main.xml

...
<android.support.design.widget.TextInputLayout
    android:id="@+id/input_name"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/toolbar">

    <EditText
        android:id="@+id/name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter username"
        android:maxLines="1" />

</android.support.design.widget.TextInputLayout>

<android.support.design.widget.TextInputLayout
    android:id="@+id/input_email"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/input_name">

    <EditText
        android:id="@+id/email"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter email"
        android:maxLines="1" />

</android.support.design.widget.TextInputLayout>
...