Scrollable XML View

I can't get a view area to scroll. I have tried many variations of tags but without success. I need the light yellow (#FFFF99) area to be very large and that the user can move it around within the view area but the buttons remain visible. Here is my XML code.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://ift.tt/nIICcg"
xmlns:tools="http://ift.tt/LrGmb4"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFCCCCCC"
android:orientation="vertical"
tools:context=".MainActivity" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_gravity="center"
android:orientation="horizontal">
<ImageButton
android:id="@+id/play_btn"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:contentDescription="@string/dice6"
android:src="@drawable/play" />

<ImageButton
android:id="@+id/exit_btn"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:contentDescription="@string/exit"
android:src="@drawable/exit" />
</LinearLayout>
<LinearLayout

android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_gravity="center"
android:orientation="horizontal" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Commentary"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>

<ScrollView 
android:id="@+id/scrollView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
adroid:scrollbarAlwaysDrawVerticalTrack="true"
android:fillViewport="true" >
<LinearLayout     
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">

<view 
class="com.summit.DrawView" 
android:id="@+id/drawing"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1.01"
android:orientation="vertical" 
android:background="#FFFF99"
/>

</LinearLayout>
</ScrollView>
</LinearLayout>**