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我正在尝试在我的应用上显示广告横幅,但我似乎遇到了问题.每当我进入活动时,应用程序崩溃并在我尝试加载广告时提及某些内容,它是一个空引用.虽然如此,我并不积极.

以下是adview的xml:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/gameLayout">

    <com.google.android.gms.ads.AdView
        android:id="@+id/bannerAd"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        ads:adSize="BANNER"
        ads:adUnitId="MY_ADUNITID" />

</FrameLayout>

以下是使用广告的java代码:

//load ads
AdView adView = (AdView)findViewById(R.id.bannerAd);
AdRequest.Builder request = new AdRequest.Builder();
request.addTestDevice(AdRequest.DEVICE_ID_EMULATOR);
adView.loadAd(request.build());

这是logcat:

09-21 21:55:39.300: E/AndroidRuntime(1168): FATAL EXCEPTION: main
09-21 21:55:39.300: E/AndroidRuntime(1168): Process: com.project.llb, PID: 1168
09-21 21:55:39.300: E/AndroidRuntime(1168): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.twentytwentythree.sab/com.twentytwentythree.sab.runGraphics}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.ads.AdView.loadAd(com.google.android.gms.ads.AdRequest)' on a null object reference
09-21 21:55:39.300: E/AndroidRuntime(1168):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2596)
09-21 21:55:39.300: E/AndroidRuntime(1168):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2653) …