Admob - aucune annonce à afficher

Bonjour
J'ai essayer de faire un certain programme d'exemple affichant des publicités sur Android, et j'essaie de le tester sur Émulateur de v2.2
Tout dans le code semble être bien, mais AdListener dans le débogueur dit que:

Message de réponse est égal à zéro ou à la valeur null;
onFailedToReceiveAd( Aucune annonce).

Est-il un moyen pour qu'il soit de ma faute? Quelqu'un rencontre le même problème?
Voici le code
Manifeste:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.AdTest"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
    <activity android:name=".AdTest"
              android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
<!-- AdMobActivity definition -->
<activity android:name="com.google.ads.AdActivity"
android:configChanges="orientation|keyboard|keyboardHidden" />
</application>
<uses-sdk android:minSdkVersion="7"></uses-sdk>
<!-- AdMob SDK requires Internet permission -->
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

Mise en page xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/main"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
>
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
/>
</LinearLayout>

et de l'Activité code

package com.AdTest;
import com.google.ads.*;
import com.google.ads.AdRequest.ErrorCode;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.LinearLayout;
public class AdTest extends Activity implements AdListener{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
LinearLayout layout = (LinearLayout)findViewById(R.id.main);
AdView adView = new AdView(this, AdSize.BANNER, "anonymouse");
//Unit ID is correct, I changed it on purpose while pasting here
adView.setAdListener(this);
layout.addView(adView);
AdRequest request= new AdRequest();
adView.loadAd(request);            
}
public void onFailedToReceiveAd(AdView adView)
{
Log.d("AdListener", "onFailedToReceiveAd");
}
public void onFailedToReceiveRefreshedAd(AdView adView)
{
Log.d("AdListener", "onFailedToReceiveRefreshedAd");
}
public void onReceiveAd(AdView adView)
{
Log.d("AdListener", "onReceiveAd");
}
public void onReceiveRefreshedAd(AdView adView)
{
Log.d("AdListener", "onReceiveRefreshedAd");
}
@Override
public void onDismissScreen(Ad arg0) {
//TODO Auto-generated method stub
}
@Override
public void onFailedToReceiveAd(Ad arg0, ErrorCode arg1) {
Log.d("AdListener", "onFailedToReceiveAD");
}
@Override
public void onLeaveApplication(Ad arg0) {
//TODO Auto-generated method stub
}
@Override
public void onPresentScreen(Ad arg0) {
//TODO Auto-generated method stub
}
@Override
public void onReceiveAd(Ad arg0) {
Log.d("AdListener", "Received succesfully");
}
}

OriginalL'auteur gisel | 2011-03-18