my activity contains 4 section as follow:

```
<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"></LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"></LinearLayout>
    <ScrollView>
        <LinearLayout></LinearLayout>
    </ScrollView>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"></LinearLayout>
</RelativeLayout>

```

what is the correct layout properties for scrollview?