我对新的admob有疑问。这是我的代码，试图在我的主要Activity中创建和加载广告:privatevoidcreateAndLoadAd(StringadUnitID,RelativeLayoutrlRoot,ViewupperView){adView=newAdView(this);adView.setAdUnitId(adUnitID);adView.setAdSize(AdSize.BANNER);adView.setId(R.id.ad_view);RelativeLayout.LayoutParamsparams=newRelativeLayout.LayoutParam