title: Button half width of screen
body: <p>I have a single button in a linear layout.  I want the button to take up half the width of its parent.  Is there a way to do this in the layout xml.</p>
  
  <pre><code>&lt;LinearLayout
      android:id="@+id/linearLayout1"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:orientation="horizontal"
      android:gravity="center_horizontal"
      android:padding="6dp"&gt;
  
      &lt;Button
          android:id="@+id/buttonCollect"
          android:layout_width="wrap_content"
          android:layout_height="match_parent"
          android:text="@string/hello"
          android:paddingLeft="8dp"
          android:paddingRight="8dp"/&gt;
  
  &lt;/LinearLayout&gt; 
  </code></pre>
  
  <p>My question is much like this one <a href="https://stackoverflow.com/q/2581481/758074">Assign width to half available screen width declaratively</a> except I only have a single button.</p>