GridLayout (not GridView) how to stretch all children evenly

I want to have a 2×2 grid with a buttons inside. This is only ICS so I am trying to use the new GridLayout given.

Here’s the XML of my layout:

 <?xml version="1.0" encoding="utf-8"?>
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/favorites_grid"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#00ff00"
    android:rowCount="2"
    android:columnCount="2">
  <Button
      android:text="Cell 0"
      android:layout_row="0"
      android:layout_column="0"
      android:textSize="14dip" />
  <Button
      android:text="Cell 1"
      android:layout_row="0"
      android:layout_column="1"
      android:textSize="14dip" />

  <Button
      android:text="Cell 2"
      android:layout_row="1"
      android:layout_column="0"
      android:textSize="14dip" />
  <Button
      android:text="Cell 3"
      android:layout_row="1"
      android:layout_column="1"
      android:textSize="14dip" />
</GridLayout>

The problem is that my views do not stretch evenly for each row. This causes a lot of extra space to the right of my GridLayout.

I tried setting layout_gravity="fill_horizontal" but that only applies to the last view on the row. This means Cell 1 stretches all the way to give enough space for Cell 0.

Thoughts on how to tackle this?