title: 2-column TableLayout with 50% exactly for each column
body: <p>This one puzzles me since my first steps with Android. I can't make both columns in a 2-column TableLayout exact 50% each.</p>
  
  <p>Here's an example:</p>
  
  <pre><code>&lt;ScrollView
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_height="wrap_content"
      android:layout_width="fill_parent" &gt;
  
      &lt;TableLayout
          android:id="@+id/tablelayout"
          android:layout_height="wrap_content"
          android:layout_width="fill_parent"
          android:paddingRight="2dip" &gt;
  
          &lt;TableRow&gt;
              &lt;TextView
                  style="@style/TextViewStandard"
                  android_layout_span="2"
                  android:layout_weight="1" 
                  android:text="Bla" /&gt;
          &lt;/TableRow&gt;
  
          &lt;TableRow&gt;
              &lt;TextView
                  style="@style/TextViewStandard"
                  android:layout_weight="1"
                  android:text="Name:" /&gt;
  
              &lt;EditText
                  style="@style/EditTextStandard"
                  android:id="@+id/et_name"
                  android:layout_weight="1" /&gt;
          &lt;/TableRow&gt;
  
          &lt;TableRow&gt;
              &lt;TextView
                  style="@style/TextViewStandard"
                  android:layout_weight="1"
                  android:text="URL:" /&gt;
  
              &lt;EditText
                  style="@style/EditTextStandard"
                  android:id="@+id/et_url"
                  android:layout_weight="1" /&gt;
          &lt;/TableRow&gt;
  
          &lt;TableRow&gt;
              &lt;Button
                  style="@style/ButtonStandard"
                  android:layout_column="0"
                  android:layout_marginTop="6dip"
                  android:onClick="onClickOk"
                  android:text="@android:string/ok" /&gt;
          &lt;/TableRow&gt;
      &lt;/TableLayout&gt;
  &lt;/ScrollView&gt;
  </code></pre>
  
  <p>And here's the corresponding style definition:</p>
  
  <pre><code>&lt;resources&gt;
      &lt;style name="ButtonStandard" parent="@android:style/Widget.Button"&gt;
          &lt;item name="android:layout_height"&gt;wrap_content&lt;/item&gt;
          &lt;item name="android:layout_width"&gt;fill_parent&lt;/item&gt;
      &lt;/style&gt;
  
      &lt;style name="EditTextStandard" parent="@android:style/Widget.EditText"&gt;
          &lt;item name="android:layout_height"&gt;wrap_content&lt;/item&gt;
          &lt;item name="android:layout_marginLeft"&gt;2dip&lt;/item&gt;
          &lt;item name="android:layout_marginRight"&gt;2dip&lt;/item&gt;
          &lt;item name="android:layout_marginTop"&gt;2dip&lt;/item&gt;
          &lt;item name="android:layout_width"&gt;fill_parent&lt;/item&gt;
      &lt;/style&gt;
  
      &lt;style name="TextViewStandard" parent="@android:style/Widget.TextView"&gt;
          &lt;item name="android:layout_height"&gt;wrap_content&lt;/item&gt;
          &lt;item name="android:layout_marginLeft"&gt;2dip&lt;/item&gt;
          &lt;item name="android:layout_marginRight"&gt;2dip&lt;/item&gt;
          &lt;item name="android:layout_marginTop"&gt;2dip&lt;/item&gt;
          &lt;item name="android:layout_width"&gt;fill_parent&lt;/item&gt;
          &lt;item name="android:textColor"&gt;@android:color/white&lt;/item&gt;
      &lt;/style&gt;
  &lt;/resources&gt;
  </code></pre>
  
  <p>This becomes really messed up with a CheckBox involved.</p>
  
  <p>What's wrong with my definition?</p>
  
  <p>Many thanks in advance.
  HJW</p>