title: Android TableLayout weights are not exact
body: <p>In the layout below I expect the rows to have exact heights first row 178px and the next two of 71px. Instead I am getting the bottom two with a few extra pixels. What am I doing wrong or is the tablelayout just not as precise as I like?</p>
  
  <pre><code>&lt;TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="480px"
      android:layout_height="320px"
      android:background="@drawable/screen"
      android:padding="0dp"
      android:layout_margin="0dp"
      android:stretchColumns="0"
      android:weightSum="320" &gt;
      &lt;TableRow android:layout_weight="178" android:padding="0dp" android:layout_margin="0dp"&gt;
          &lt;TextView
            android:text=""
            android:gravity="center_horizontal"
            android:background="#99aa0000"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:padding="0dp"
             /&gt;
      &lt;/TableRow&gt;
      &lt;TableRow android:layout_weight="71" android:padding="0dp" android:layout_margin="0dp"&gt;
          &lt;TextView
            android:text=""
            android:gravity="center_horizontal"
            android:background="#990000aa"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:padding="0dp"
            android:layout_margin="0dp" /&gt;
  
      &lt;/TableRow&gt;
      &lt;TableRow android:layout_weight="71" android:padding="0dp" android:layout_margin="0dp"&gt;
          &lt;TextView
            android:text=""
            android:gravity="center_horizontal"
            android:background="#9900aa00"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:padding="0dp"
            android:layout_margin="0dp"
            /&gt;
      &lt;/TableRow&gt;
  &lt;/TableLayout&gt;
  &lt;/blink&gt; 
  </code></pre>