Android Admob横幅广告仅在特定上下文中无法查看

Question

我有一个活动，我试图显示admob横幅，但它永远不会出现在此活动中，我已经修改了参数与其他活动和xml文件，没有什么不同的除了粗糙的java代码逻辑背后和xml设计，与调用admob横幅相关的任何其他内容都是相同的。

xml代码

 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#CCFF0FF0"
 >
<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >
<com.google.android.gms.ads.AdView
    android:id="@+id/adView"
     android:layout_height="wrap_content" 
android:layout_width="wrap_content"
    ads:adSize="BANNER"
    ads:adUnitId="myid" />
    <AutoCompleteTextView
        android:id="@+id/AutoCompleteTextView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="Search" >

        <requestFocus />
    </AutoCompleteTextView>

    <RelativeLayout
        android:id="@+id/RelativeLayout1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_gravity="left"
        android:gravity="right" >

        <Button
            android:id="@+id/a"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
              android:layout_alignParentRight="true"
            android:text="a" />

        <Button
            android:id="@+id/b"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"

             android:layout_centerInParent="true"
            android:layout_alignParentTop="true"
            android:gravity="center_horizontal"
            android:text="b" />

        <Button
            android:id="@+id/c"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:text="c" />
    </RelativeLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <fragment
            android:id="@+id/afragment"
            android:name="Fragments.Afragment"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </LinearLayout>


</LinearLayout>

我的java代码看起来与本教程完全相同，因为请求部分

，我不会发布完整的代码

public class MainActivity extends Activity {
private InterstitialAd interstitial;
AdView adView;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // Get the view from activity_main.xml
    setContentView(R.layout.activity_main);

    // Prepare the Interstitial Ad
    interstitial = new InterstitialAd(MainActivity.this);
    // Insert the Ad Unit ID
    interstitial.setAdUnitId("myid");

    //Locate the Banner Ad in activity_main.xml
     adView = (AdView) this.findViewById(R.id.adView);

    // Request for Ads
    AdRequest adRequest = new AdRequest.Builder()

    // Add a test device to show Test Ads
     .addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
            .build();

    // Load ads into Banner Ads
    adView.loadAd(adRequest);
//      adView.
    // Load ads into Interstitial Ads
    interstitial.loadAd(adRequest);

    // Prepare an Interstitial Ad Listener
    interstitial.setAdListener(new AdListener() {
        public void onAdLoaded() {
            // Call displayInterstitial() function
            displayInterstitial();
        }
        @Override
        public void onAdOpened() {
            // TODO Auto-generated method stub
            super.onAdOpened();
        }
    });

public void displayInterstitial() {
    // If Ads are loaded, show Interstitial else show nothing.
    if (interstitial.isLoaded()) {
        interstitial.show();
    }
 }
 }

广告横幅位置在运行时保留，但没有显示任何内容！