Android :: Fitting Table Of ImageButtons Within The Screen

I am trying to create a table of 7 rows and 7 columns of ImageButtons - buttons with image resource added from the drawable folder. The problem is I can only see the first button and the rest go off screen. How do I scale the image or the buttons so all 49 can be viewed on screen?

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TableRow>
<ImageButton
android:id="@+id/r0c0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/frog"
android:scaleType="centerInside"....................