So far in my learning I have only come across spreading column sizes equally, giving one/two a higher priority to take as much space as they need, or setting the size of a colum
You can do this by using android:layout_span
Here is an example :
<?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"
android:stretchColumns="*">
<TableRow
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:background="#aa0000"
android:text="1/6"
android:gravity="center_horizontal"/>
<TextView
android:background="#00aa00"
android:text="3/6"
android:gravity="center_horizontal"
android:layout_span="3"/>
<TextView
android:background="#0000aa"
android:text="2/6"
android:gravity="center_horizontal"
android:layout_span="2"/>
</TableRow>
</TableLayout>