The onAdLoaded method is executed when an ad has finished loading. If you want to delay adding the AdView to your activity or fragment until you're sure an ad will be loaded, for example, you can do so here. If you're using a third-party analytics package to track impressions, this is also where you can place the call to record one.
# 1 楼答案
只需实现一个AdListener来监听
onAdLoaded
事件Source
注意没有必要override all methods