admob cannot be viewed in android

i tried using Admob in my app by running it in a device and it showed nothing and i found the followig errors in logcat

04-07 10:49:05.570: ERROR/Ads(1084): AdView missing required XML attribute adUnitId. 04-07 10:49:07.850: ERROR/Ads(1084): Could 开发者_开发百科not find com.google.ads.AdActivity, please make sure it is registered in AndroidManifest.xml.

But in manifest file i have mentioned the following lines {<meta-data android:value="axxxxxxxxxxxxxxxx" android:name="ADMOB_PUBLISHER_ID"/> <activity android:name="com.google.ads.AdMobActivity"/>}

What is my error...

I have totally 4 Activities in my App and i am trying to add the admob in my 4th activity. whether i have to add the above said lines with that activity or anything else pls help me friends...

The error shown can be fixed by adding the following to the manifest file:

<activity android:name="com.google.ads.AdActivity" android:theme="@android:style/Theme.NoTitleBar.Fullscreen" android:configChanges="orientation|keyboard|keyboardHidden" />