Flutter :- 这个 AdWidget 已经在 Widget 树中了如何禁用此异常这是什么意思？

问题描述

所以我在列表中插入了 admob 广告。我在列表视图中添加了无限滚动的功能。因此，当用户滚动到列表末尾时，新项目会添加到列表中。对于这些项目，我还在其中添加了 admob 广告。

因此，当用户滚动到末尾时，新项目和广告会添加到列表中。那时捕获了以下异常。那么如何解决这个异常。

======== Exception caught by widgets library =======================================================
The following assertion was thrown building AdWidget-[#53ef3](dirty,state: _AdWidgetState#850ac):
This AdWidget is already in the Widget tree


If you placed this AdWidget in a list,make sure you create a new instance in the builder function with a unique ad object.
Make sure you are not using the same ad object in more than one AdWidget.

The relevant error-causing widget was: 
  AdWidget-[#53ef3] file:///D:/flutter%20project/memer/lib/pages/TimeLinePage.dart:198:42
When the exception was thrown,this was the stack: 
#0      _AdWidgetState.build (package:google_mobile_ads/src/ad_containers.dart:371:7)
#1      StatefulElement.build (package:flutter/src/widgets/framework.dart:4612:27)
#2      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4495:15)
#3      StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4667:11)
#4      Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5)

代码：-

return ListView.builder(itemBuilder: (context,index){
        //print(posts);
        if(posts[index] is Post){
          return posts[index];
        }
        else{
          final Container adContainer = Container(
                                  alignment: Alignment.center,child: AdWidget(key: UniqueKey(),ad: posts[index] as BannerAd),//AdmobService.createBannerAd()..load()
                                  height: 50,);
                      return adContainer;
        }
      },itemCount: posts.length,controller: scrollController,physics: const BouncingScrollPhysics(parent: AlwaysScrollableScrollPhysics()));
    }

解决方法

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admob firebase-admob flutter-dependencies