title: Android: relative layout, put an element at the bottom
body: <p>Hello i have this layout:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical" &gt;
  &lt;ImageView
      android:src="@drawable/head"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="top"
      android:id="@+id/image1"
       /&gt;
  &lt;Button
      android:id="@+id/button1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:background="@drawable/scan"
      android:text=""
      android:layout_below="@+id/image1" /&gt;
  &lt;LinearLayout
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/mio_ad"&gt;
  &lt;/LinearLayout&gt;
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>there's no way i can put my #mio_ad at the bottom: it remains at the top.
  how can i?
  thanks.</p>