Issue with layout inside scroll view

Question

I have this layout:

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <EditText
            android:id="@+id/username_edittext"
            android:layout_width="match_parent"
            android:layout_height="55dp"
            android:background="@android:color/white"
            android:gravity="center"
            android:hint="@string/username"
            android:textColor="@color/dark_grey" />

        <EditText
            android:id="@+id/password_edittext"
            android:layout_width="match_parent"
            android:layout_height="55dp"
            android:layout_below="@id/username_edittext"
            android:background="@android:color/white"
            android:gravity="center"
            android:hint="@string/password"
            android:textColor="@color/dark_grey" />

        <Button
            android:id="@+id/login_button"
            style="@style/ButtonStyle"
            android:layout_width="match_parent"
            android:layout_height="55dp"
            android:layout_alignParentBottom="true"
            android:layout_below="@id/password_edittext"
            android:text="@string/login" />

    </RelativeLayout>

</ScrollView>

and it is shown as:

But I want align the button "Entrar" (login_button) at bottom of the screen. RelativeLayout is not filling parent (ScrollView) so alignParentBottom = true in the button is not working properly.

What can I do?

Thanks.

Answer 1

Solved! I have added android:fillViewport="true" in the ScrollView and removed the android:layout_below="@id/password_edittext" from the Button.

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fillViewport="true">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <EditText
            android:id="@+id/username_edittext"
            android:layout_width="match_parent"
            android:layout_height="55dp"
            android:background="@android:color/white"
            android:gravity="center"
            android:hint="@string/username"
            android:textColor="@color/dark_grey" />

        <EditText
            android:id="@+id/password_edittext"
            android:layout_width="match_parent"
            android:layout_height="55dp"
            android:layout_below="@id/username_edittext"
            android:background="@android:color/white"
            android:gravity="center"
            android:hint="@string/password"
            android:textColor="@color/dark_grey" />

        <Button
            android:id="@+id/login_button"
            style="@style/ButtonStyle"
            android:layout_width="match_parent"
            android:layout_height="55dp"
            android:layout_alignParentBottom="true"
            android:text="@string/login" />

    </RelativeLayout>

</ScrollView>