Admob ads not showing - Android

Question

My ads don't display at all, I think I've followed the documentation correctly but they still won't show. The program is basically a webview and I want the ad to display at the bottom.

Heres my layout file:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:myapp="http://schemas.android.com/apk/res/man.utd.headlines"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent">
   <WebView
      android:id="@+id/webview"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent" />
   <com.admob.android.ads.AdView
      android:id="@+id/ad"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      myapp:backgroundColor="#000000"
      myapp:primaryTextColor="#FFFFFF"
      myapp:secondaryTextColor="#CCCCCC" />
</LinearLayout>

Any ideas?

EDIT: this is what I now have but it still doesn't appear to be quite right:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:myapp="http://schemas.android.com/apk/res/man.utd.headlines"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent" >
<com.admob.android.ads.AdView 
    android:id="@+id/ad"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    myapp:backgroundColor="#000000"
    myapp:primaryTextColor="#FFFFFF"
    myapp:secondaryTextColor="#CCCCCC" />
<WebView
    android:id="@+id/webview"
    android:layout_above="@id/ad"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" />
</RelativeLayout>

Answer 1

Your Problem is that the WebView will take all the space on the screen and there is no space left for the ads.

A LinearLayout will distribute the space on a first come first serve rule. If the first View takes all the space the second view won't get any space..

I would use a RelativeLayout and add the adds first with a layout_alignParentBottom attribute and then add the webview with a layout_above="id for the adds". This will ensure that the adds are always on the bottom of the screen even if the webview wont take all the space at the moment and the webview will always be above the adds.