Afficher la carte de Google dans mon application

salut à tous

voici mon programme
tout va bien sauf que la carte ne s'affiche pas
merci de m'aider

*********java*********

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package com.android.map;
 
import android.os.Bundle;
 
import com.google.android.maps.MapActivity;
 
public class HelloGoogleMapActivity extends MapActivity {
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.main);
 }
 
 @Override
 protected boolean isRouteDisplayed()
 {
   return false;
 }
 
}

*****main.xml************

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 >
<com.google.android.maps.MapView
 android:id="@+id/mapView"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:enabled="true"
 android:clickable="true"
 android:apiKey="@string/mapKey"
 />
 
</LinearLayout>

************string.xml*************
à noter que j'ai tapé mon clé API au lieu de xxxxxxxxxxxxxxxxxx

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<?xml version="1.0" encoding="utf-8"?>
<resources>
     <string name="hello">Hello World, HelloGoogleMapActivity!</string>
     <string name="app_name">GoogleMapTuto</string>
     <string name="mapKey">XxxxxxxxxxxxxxxxxxxxxxxxxX</string>
</resources>

************manifest******************

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.android.map"
 android:versionCode="1"
 android:versionName="1.0">
   <application android:icon="@drawable/icon" android:label="@string/app_name">
       <uses-library android:name="com.google.android.maps" />
       <activity android:name=".HelloGoogleMapActivity"
                     android:label="@string/app_name">
           <intent-filter>
              <action android:name="android.intent.action.MAIN" />
              <category android:name="android.intent.category.LAUNCHER" />
          </intent-filter>
      </activity>
  </application>
 
  <uses-permission android:name="android.permission.INTERNET" />
</manifest>