Not enough space to show ad (AdMob)

I am trying to show AdMob ads in my activity, but it is always giving error that "not enough space to show ad".

My XML file is:

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <com.google.ads.AdView
        android:id="@+id/adMobadView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        ads:adSize="BANNER"
        ads:adUnitId="@string/admobid"
        android:layout_alignParentBottom="true"
        android:gravity="bottom|center_horizontal"
        ads:loadAdOnCreate="true" />
</RelativeLayout>

My Java file:

    AdView ad=(AdView)findViewById(R.id.adMobadView);

    AdRequest re = new AdRequest();
    re.setTesting(true);
    re.setGender(AdRequest.Gender.FEMALE);
    ad.loadAd(re);

LogCat:

   02-18 14:16:17.869: W/webcore(813): Can't get the viewWidth after the first layout
   02-18 14:16:17.979: I/Ads(813): onReceiveAd()
   02-18 14:16:17.979: W/Ads(813): Not enough space to show ad! Wants: <320, 50>, Has: <288, 430>

The left and right padding of your RelativeLayout is consuming space required by your AdView.

Change RelativeLayout config to :

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 ...
 android:paddingLeft="0dp"
 android:paddingRight="0dp"
 ...
>

You probably also want to change your AdView config to:

<com.google.ads.AdView
        android:id="@+id/adMobadView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        ...
        />

as you don't really want your AdView to consume the entire screen.