activity_login.xml

<AutoCompleteTextView
    android:id="@+id/email"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="@string/prompt_email"
    android:inputType="textEmailAddress"
    android:maxLines="1" />

<EditText
    android:id="@+id/password"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="@string/prompt_password"
    android:imeActionId="@+id/login"
    android:imeActionLabel="@string/action_sign_in_short"
    android:imeOptions="actionUnspecified"
    android:inputType="textPassword"
    android:maxLines="1" />

<Button
    android:id="@+id/email_sign_in_button"
    style="?android:textAppearanceSmall"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="16dp"
    android:text="@string/action_sign_in"
    android:textStyle="bold" />