Android admob ad不'；t出现，并且没有错误

我用admob广告创建了一个简单的应用程序，但广告没有出现，也没有错误，API级别为21

这是我的密码：

xml文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/RelativeLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<com.google.android.gms.ads.AdView
    android:id="@+id/adView"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:layout_marginBottom="76dp"
    ads:adSize="SMART_BANNER"
    ads:adUnitId="ca-app-pub-2615894909216466/7973602032">
     </com.google.android.gms.ads.AdView>

</RelativeLayout>

logcat消息：

10-31 16:30:11.267: W/ScreenOrientationListener(1199): Removing an       inexistent observer!
10-31 16:30:11.383: W/Ads(1199): There was a problem getting an ad response. ErrorCode: 0
10-31 16:30:11.506: W/art(1199): Attempt to remove local handle scope entry from IRT, ignoring
10-31 16:30:11.547: W/AwContents(1199): onDetachedFromWindow called when already detached. Ignoring
10-31 16:30:11.647: W/art(1199): Attempt to remove local handle scope entry from IRT, ignoring
10-31 16:30:11.730: W/Ads(1199): Failed to load ad: 0

确保：

您在清单文件中具有Internet权限 name=“banner\u ad\u unit\u id”>yourAppID

Java类中有一行代码：MobileAds.initialize（mainActivity.getApplicationContext（），“YourAppID”）

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有时广告不会从服务器加载，原因总是出现在logcat中，请注意并跟踪它，然后将其添加到帖子中。@我在帖子中添加了logcat如果您在emulator中测试应用程序，请尝试在真实设备上测试它。@Mohamed我在我的设备上尝试过，但仍然不起作用。

10-31 16:30:11.267: W/ScreenOrientationListener(1199): Removing an       inexistent observer!
10-31 16:30:11.383: W/Ads(1199): There was a problem getting an ad response. ErrorCode: 0
10-31 16:30:11.506: W/art(1199): Attempt to remove local handle scope entry from IRT, ignoring
10-31 16:30:11.547: W/AwContents(1199): onDetachedFromWindow called when already detached. Ignoring
10-31 16:30:11.647: W/art(1199): Attempt to remove local handle scope entry from IRT, ignoring
10-31 16:30:11.730: W/Ads(1199): Failed to load ad: 0