在我的应用中，我想显示来自不同网络的奖励视频。仅使用AdMob的奖励视频会出现问题。完成后，我会收到此错误：
完整堆栈：
java.lang.AbstractMethodError: abstract method "void com.google.android.gms.ads.reward.RewardedVideoAdListener.onRewardedVideoCompleted()"
at com.google.android.gms.internal.ads.zzain.onRewardedVideoCompleted(Unknown Source)
at com.google.android.gms.internal.ads.zzaij.dispatchTransaction(Unknown Source)
at com.google.android.gms.internal.ads.zzen.onTransact(Unknown Source)
at android.os.Binder.transact(Binder.java:387)
at oa.b(:com.google.android.gms.dynamite_adsdynamite@14366052@14.3.66 (040700-213742215):15)
at com.google.android.gms.ads.internal.reward.client.n.f(:com.google.android.gms.dynamite_adsdynamite@14366052@14.3.66 (040700-213742215):19)
at com.google.android.gms.ads.internal.a.u(:com.google.android.gms.dynamite_adsdynamite@14366052@14.3.66 (040700-213742215):354)
at com.google.android.gms.ads.internal.reward.e.l_(:com.google.android.gms.dynamite_adsdynamite@14366052@14.3.66 (040700-213742215):55)
at com.google.android.gms.ads.internal.reward.mediation.h.h(:com.google.android.gms.dynamite_adsdynamite@14366052@14.3.66 (040700-213742215):26)
at com.google.android.gms.ads.internal.reward.mediation.client.d.g(:com.google.android.gms.dynamite_adsdynamite@14366052@14.3.66 (040700-213742215):38)
at com.google.ads.mediation.b.f(:com.google.android.gms.dynamite_adsdynamite@14366052@14.3.66 (040700-213742215):27)
at com.google.android.gms.ads.internal.reward.client.q.f(:com.google.android.gms.dynamite_adsdynamite@14366052@14.3.66 (040700-213742215):18)
at com.google.android.gms.ads.internal.a.u(:com.google.android.gms.dynamite_adsdynamite@14366052@14.3.66 (040700-213742215):354)
at com.google.android.gms.ads.internal.al.aa(:com.google.android.gms.dynamite_adsdynamite@14366052@14.3.66 (040700-213742215):219)
at com.google.android.gms.ads.internal.gmsg.al.a(:com.google.android.gms.dynamite_adsdynamite@14366052@14.3.66 (040700-213742215):9)
at com.google.android.gms.ads.internal.webview.j.a(:com.google.android.gms.dynamite_adsdynamite@14366052@14.3.66 (040700-213742215):293)
at com.google.android.gms.ads.internal.webview.ac.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at com.google.android.gms.ads.internal.util.e.dispatchMessage(:com.google.android.gms.dynamite_adsdynamite@14366052@14.3.66 (040700-213742215):5)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5480)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
我了解问题出在需要RewardedVideoAdListener的admob视频中。但是我不知道如何从Appodeal获取它的实例。我该如何解决这个问题？