Android Admob代码不工作

下面的代码是我实现的，只是为了检查admob广告检索，但我无法获得任何广告，尽管代码甚至没有崩溃。 请告知此代码中的错误

public class MainActivity extends Activity {

    public AdView  admobView;
    public View mainView;

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

        admobView = new AdView(this, AdSize.BANNER, "Top secret");
        RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.WRAP_CONTENT,
                RelativeLayout.LayoutParams.WRAP_CONTENT);
        lp.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
        admobView.setLayoutParams(lp);
        //mainView.setLayoutParams(lp);

        RelativeLayout layout = new RelativeLayout(this);

        AdRequest adRequest = new AdRequest();

        //tested this
        adRequest.addTestDevice(AdRequest.TEST_EMULATOR);               // Emulator

        //tested this
        //adRequest.addTestDevice("20cb18e8ffc74ad2");

        //tested this
        //adRequest.addMediationExtra("3d879f364d5747c5", null);
        admobView.loadAd(adRequest);
        layout.addView(admobView);
        //layout.addView(mainView);

        setContentView(layout);
    }

---

您是否在menifest中添加了admob的权限和更改。因为我已经运行了你的代码，它显示在我的模拟器中。此外，为了显示“添加”应用程序的targetSdkVersion需要大于14

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

<activity android:name="com.google.ads.AdActivity"
            android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize" >
        </activity>

和Manifest=

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.ee"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name="com.google.ads.AdActivity"
            android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize" >
        </activity>
    </application>

</manifest>

如果“layout”变量被向下声明，我如何调用上面的代码？上面的代码实际上没有崩溃，我不能在logcat中看到这个东西，但广告是不可见的。I/Ads（601）：收到的广告url：您是否在LogCat中收到

onReceiveAd（）

或

onFailedToReceiveAd（）

通知？

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.ee"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name="com.google.ads.AdActivity"
            android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize" >
        </activity>
    </application>

</manifest>