Android : Add a footer to a GridView Android

I am developing an android application for listing the products of an on-line store. For this I have used a GridView for that. But inside a category could be a big number of products, so I have to implement a feature like, "Loading on demand", with a button at the end of a gridView telling (Load More). Of course this button will be visible only if the GridView has reached the end of the items. But I dont how to do it. Below is my solution so far, but the button is not visible when gridview goes at the end.

<?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="fill_parent"
    android:fillViewport="true" >

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

        <com.twotoasters.jazzylistview.JazzyGridView
            android:id="@+id/ebuy_list"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:drawSelectorOnTop="true"
            android:horizontalSpacing="15dp"
            android:numColumns="2"
            android:verticalSpacing="15dp" />

        <TextView
            android:id="@+id/more"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:layout_marginTop="10dp"
            android:background="@drawable/ebuy_now_background"
            android:clickable="true"
            android:onClick="loadMore"
            android:padding="15dp"
            android:text="Load More"
            android:textColor="@color/ebuy_color_second_strip"
            android:textSize="25sp" />

    </LinearLayout>

</ScrollView>

Suggestions or other solution will be more than welcome :)