google Map


刚刚看视频做个google Map  但是怎么也出不来  各项我认为都配置正确了  求大神指导看哪儿出了问题
package com.example.activity3_06;import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;import android.os.Bundle;
public class MainActivity extends MapActivity {
    /** Called when the activity is first created. */
    @Override
   
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        MapView mapView = (MapView) findViewById(R.id.mapview);
        mapView.setBuiltInZoomControls(true);
    } @Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
   
}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.activity3_06"
    android:versionCode="1"
    android:versionName="1.0" >    <uses-sdk
        android:minSdkVersion="10"
        android:targetSdkVersion="10" />
  
     <uses-permission android:name="android.permission.INTERNET" />
     
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <uses-library android:name="com.google.android.maps" />
        <activity
            android:name="com.example.activity3_06.MainActivity"
            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>
       </manifest>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    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.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="AIzaSyBZ7QIPfb7SMWmcgi2XwZwynRx6lhSgtHU"
     /></RelativeLayout>