[Solved] Android Development Layout

Try this

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/background">
<RelativeLayout
    android:layout_width="match_parent"
    android:layout_marginBottom="10dp"
    android:layout_marginTop="5dp"
    android:background="@color/black"
    android:layout_marginRight="5dp"
    android:layout_marginLeft="10dp"
    android:layout_height="match_parent">
    <RelativeLayout
        android:layout_alignParentBottom="true"
        android:layout_width="match_parent"
        android:background="@color/cost"
        android:layout_height="60sp"/>
</RelativeLayout>