Android AdMob未在片段活动中显示

AdMob未在片段活动中显示，我的代码如下所示。但同样的代码也适用于正常活动。没有得到这个代码中的错误。请建议

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.fragment_delete);

    adView = (AdView)findViewById(R.id.adView);
    adView.loadAd(new AdRequest());

}

AndroidManifest.xml

---

您必须将以下内容添加到清单文件（应用程序内部）。如果您还没有在Eclipse工作区中添加和引用GooglePlayServices库项目，也可以这样做

<meta-data android:name="com.google.android.gms.version"
           android:value="@integer/google_play_services_version"/>

这是谷歌的完整教程

<uses-sdk
    android:minSdkVersion="11"
    android:targetSdkVersion="17" />

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<!-- Required permission to check licensing. -->
<uses-permission android:name="com.android.vending.CHECK_LICENSE" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@android:style/Theme.Holo.Light" >
    <activity
        android:name=".MainFragmentActivity"
        android:label="@string/app_name"
        android:screenOrientation="portrait" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>

        <meta-data
            android:name="android.app.default_searchable"
            android:value=".extra.SearchManager" />
    </activity>
    <activity
        android:name=".DeleteRecords"
        android:parentActivityName=".MainFragmentActivity"
        android:screenOrientation="portrait" >
    </activity>
    <activity
        android:name="com.google.ads.AdActivity"
        android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize" />
</application>

<meta-data android:name="com.google.android.gms.version"
           android:value="@integer/google_play_services_version"/>