layout_weight is not working in scroll view

Question

I am trying to use this code but its not working when i put layout weight.If i remove layout weight and enter height for image view,it works fine.

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:weightSum="10">

    <ImageView
        android:id="@+id/informative_image_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="3.7"
        android:scaleType="fitXY"></ImageView>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view_option_menu"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="6.3" />
</LinearLayout>
</ScrollView>

Answer 1

Actually you don't need scrollview. Remove it. And if you are using recyclerview inside scrollview then you need to specify height in dp of list to make it work properly.