apply layout_weight in a xml object so that it will have 20% of height and 80% of width

cus_view.xml

    /**
     * Author S Mahbub-Uz Zaman on November 8, 2015
     * Lisence Under GPL2
    */

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:weightSum="100">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="20"
        android:orientation="horizontal"
        android:weightSum="100">

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="90"
            android:background="@color/topic_bg">

            <TextView
                android:id="@+id/text"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_gravity="left"
                android:padding="5dp"
                android:text="dffsdfdf"
                android:textColor="@android:color/white"
                android:textSize="17sp"
                android:textStyle="bold" />
        </LinearLayout>
    </LinearLayout>
</LinearLayout>