How to set content in a Linear layout to the BOTTOM of the Screen in Android.?

See the following XML code

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <include layout="@layout/header" />

        <TextView
            android:layout_width="fill_parent"
            android:layout_height="18dp" />

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/header"
            android:orientation="horizontal" >

            <ImageView
                android:layout_width="50dp"
                android:layout_height="50dp"
                android:src="@drawable/calendar" />

            <TextView
                android:id="@+id/tvTitle"
                android:layout_width="fill_parent"
                android:layout_height="50dp"
                android:gravity="center"
                android:text="@string/calendar"
                android:textColor="#FFFFFFFF"
                android:textSize="18sp" />
        </LinearLayout>

        <LinearLayout
            android:id="@+id/myLayout"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" >


        </LinearLayout>
        <!-- <include layout="@layout/footer"/> -->

        <LinearLayout 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            android:background="@drawable/datename_bottom_bg"
            android:orientation="horizontal">


            <TextView
                android:id="@+id/upgrade_4"