Extra spacing is showing at the bottom of the Scrollview

[amitranjan0007]

<com.emilsjolander.components.StickyScrollViewItems.StickyScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/parentScroolView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:fillViewport="true">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:weightSum="1"
    android:orientation="vertical">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dip"
        android:layout_weight=".2"
        android:background="@color/gift_vouchr_header_img"
        android:gravity="center">
        <ImageView
            android:id="@+id/imageview_gift"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@drawable/splash"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:background="@color/lvb_divider_color"
        android:layout_height="0dip"
        android:layout_weight=".8"
        android:orientation="vertical">
        <android.support.design.widget.TabLayout
            android:id="@+id/common_tablayout"
            style="@style/VoucherTabLayoutStyle"
            android:layout_width="match_parent"
            app:tabGravity="fill"
            app:tabMode="fixed"
            android:layout_height="@dimen/margin_48"
            android:tag="sticky">
        </android.support.design.widget.TabLayout>


    <android.support.v4.view.ViewPager
        android:id="@+id/common_viewpager"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    </android.support.v4.view.ViewPager>
    </LinearLayout>
</LinearLayout>