广告能够正常显示，但是关闭广告就崩溃了
AndroidRuntime: FATAL EXCEPTION: main
Process: org.cocos2d.helloworld, PID: 23142
java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/gms/safetynet/SafetyNet;
at com.google.android.gms.internal.zzafx.zza(Unknown Source)
at com.google.android.gms.internal.zzafs.zzha(Unknown Source)
at com.google.android.gms.internal.zzaln.reset(Unknown Source)
at com.google.android.gms.internal.zzama.destroy(Unknown Source)
at com.google.android.gms.internal.zzalz.destroy(Unknown Source)
at com.google.android.gms.ads.internal.zzbt.zzbZ(Unknown Source)
at com.google.android.gms.ads.internal.zzal.zzba(Unknown Source)
at com.google.android.gms.ads.internal.zzal.zzao(Unknown Source)
at com.google.android.gms.ads.internal.zzd.zzaz(Unknown Source)
at com.google.android.gms.ads.internal.zzal.zzaz(Unknown Source)
at com.google.android.gms.ads.internal.overlay.zzm.zzfM(Unknown Source)
at com.google.android.gms.ads.internal.overlay.zzm.zzfL(Unknown Source)
at com.google.android.gms.ads.internal.overlay.zzm.onPause(Unknown Source)
at com.google.android.gms.ads.AdActivity.onPause(Unknown Source)
at android.app.Activity.performPause(Activity.java:6138)
at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1305)
at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3452)
at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3425)
at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3400)
at android.app.ActivityThread.access$1400(ActivityThread.java:152)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1359)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5539)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: java.lang.ClassNotFoundException: Didn’t find class “com.google.android.gms.safetynet.SafetyNet” on path: DexPathList[[zip file “/data/app/org.cocos2d.helloworld-2/base.apk”],nativeLibraryDirectories=[/data/app/org.cocos2d.helloworld-2/lib/arm, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at com.google.android.gms.internal.zzafx.zza(Unknown Source)
at com.google.android.gms.internal.zzafs.zzha(Unknown Source)
at com.google.android.gms.internal.zzaln.reset(Unknown Source)
at com.google.android.gms.internal.zzama.destroy(Unknown Source)
at com.google.android.gms.internal.zzalz.destroy(Unknown Source)
at com.google.android.gms.ads.internal.zzbt.zzbZ(Unknown Source)
at com.google.android.gms.ads.internal.zzal.zzba(Unknown Source)
at com.google.android.gms.ads.internal.zzal.zzao(Unknown Source)
at com.google.android.gms.ads.internal.zzd.zzaz(Unknown Source)
at com.google.android.gms.ads.internal.zzal.zzaz(Unknown Source)
at com.google.android.gms.ads.internal.overlay.zzm.zzfM(Unknown Source)
at com.google.android.gms.ads.internal.overlay.zzm.zzfL(Unknown Source)
at com.google.android.gms.ads.internal.overlay.zzm.onPause(Unknown Source)
at com.google.android.gms.ads.AdActivity.onPause(Unknown Source)
at android.app.Activity.performPause(Activity.java:6138)
at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1305)
at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3452)
at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3425)
at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3400)
at android.app.ActivityThread.access$1400(ActivityThread.java:152)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1359)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5539)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Suppressed: java.lang.ClassNotFoundException: com.google.android.gms.safetynet.SafetyNet
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
… 29 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available