Flutter刷新指示器重建Listview。使用StreamBuilder添加新项目后的Builder

Question

我有一个包含在StreamBuilder中的刷新指标。每当StreamBuilder添加了新数据时，刷新指标都会重建其Listview。建筑商在这个过程中跳到了顶端。

StreamBuilder（stream： apiResultStream.stream，Builder：（BuildContext上下文，AsyncSnapshot快照）{if（snapshot.has错误）{print（有错误）；}if（！snapshot.has数据）{

            return  RefreshIndicator(
                onRefresh: () {
                  _apiResult=[];
                  return _loadMoreData(0);
                },
                child:snapshot.data.length == 0 ? Padding(
                  padding: const EdgeInsets.all(20.0),
                  child: Center(child: Text('No items', style: TextStyle(fontSize: 16.0, fontWeight: FontWeight.bold),)),
                ):SingleChildScrollView(
                    controller: scrollController,
                    physics: const AlwaysScrollableScrollPhysics(),
                    child:ListView.builder(
                    itemBuilder:(BuildContext ctxt, int index){
                      return InkWell(
                          
                          child:TripItem(key: ValueKey(snapshot.data[index].Id),item:snapshot.data[index])
                      );
                    }
                    ,itemCount:snapshot.data.length,
                    shrinkWrap: true,
                      physics: NeverScrollableScrollPhysics(),
                    key: UniqueKey(),


                ))

            );
     

Answer 1

解决方案是将GlobalKey添加到刷新指标。当StreamBuilder有新数据时，这将阻止ReresIndex重建其子级。

StreamBuilder(
    stream: apiResultStream.stream,
    builder:
        (BuildContext context, AsyncSnapshot<dynamic> snapshot) {
          if(snapshot.hasError){
            print("has error");
          }
          if(!snapshot.hasData)
          {


       
            return  RefreshIndicator(
                key: _refreshIndicatorKey ,
                onRefresh: () {
                  _apiResult=[];
                  return _loadMoreData(0);
                },
                child:snapshot.data.length == 0 ? Padding(
                  padding: const EdgeInsets.all(20.0),
                  child: Center(child: Text('No items', style: 
                  TextStyle(fontSize: 16.0, fontWeight: 
                  FontWeight.bold),)),
                ):SingleChildScrollView(
                    controller: scrollController,
                    physics: const AlwaysScrollableScrollPhysics(),
                    child:ListView.builder(
                    itemBuilder:(BuildContext ctxt, int index){
                      return InkWell(
                          
                          child:TripItem(key: 
            ValueKey(snapshot.data[index].Id),item:snapshot.data[index])
                      );
                    }
                    ,itemCount:snapshot.data.length,
                    shrinkWrap: true,
                      physics: NeverScrollableScrollPhysics(),
                    key: UniqueKey(),


                ))

);