在浏览fluttertutorial中的示例时classRandomWordsStateextendsState{...Widget_buildSuggestions(){returnnewListView.builder(padding:constEdgeInsets.all(16.0),itemBuilder:(context,i){if(i.isOdd)returnnewDivider();finalindex=i~/2;if(index>=_suggestions.length){_suggestions.addAll(generateWordPairs().take(10))

在浏览fluttertutorial中的示例时classRandomWordsStateextendsState{...Widget_buildSuggestions(){returnnewListView.builder(padding:constEdgeInsets.all(16.0),itemBuilder:(context,i){if(i.isOdd)returnnewDivider();finalindex=i~/2;if(index>=_suggestions.length){_suggestions.addAll(generateWordPairs().take(10))

这是我的代码:build(BuildContextcontext){returnnewScaffold(body:newSafeArea(child:newListView.builder(itemBuilder:(itemBuilder),itemCount:(1),padding:kMaterialListPadding,),));}itemBuilder(BuildContextcontext,intindex){returnnewTextFormField(decoration:newInputDecoration(border:constOutlineInputBorder(

这是我的代码:build(BuildContextcontext){returnnewScaffold(body:newSafeArea(child:newListView.builder(itemBuilder:(itemBuilder),itemCount:(1),padding:kMaterialListPadding,),));}itemBuilder(BuildContextcontext,intindex){returnnewTextFormField(decoration:newInputDecoration(border:constOutlineInputBorder(

所以我有一个JSONurl，其中包含一些数据，例如名称、纬度和经度。但是，并非每个对象都有纬度和经度，我只想显示具有纬度和经度的对象的名称。带有lat和lng的JSON示例对象:dynamicDataUrl:"http://example.com",staticDataUrl:"http://example.com",limitedAccess:false,locationForDisplay:{coordinatesType:"LA4556",latitude:52.2490470982696,longitude:6.16317987442017},identifier:"4556r

除了content和index之外，我想将额外的参数传递给我的itemBuilder函数。我该怎么做？body:newListView.builder(itemCount:litems.length,itemBuilder:(BuildContextctxt,intindex){returnnewText(litems[index]);})我想要这样的东西:intk="HI";body:newListView.builder(itemCount:litems.length,itemBuilder:(BuildContextctxt,intindex,Stringk){returnnew