Flutter：SliverList中的ListView Builder [英] Flutter: ListView Builder inside SliverList
问题描述
我正在尝试在Listbox Builder中使用Flutter EasyRefresh插件。
https://pub.dev/packages/flutter_easyrefresh
I am trying to use Flutter EasyRefresh plugin in Listbox Builder. https://pub.dev/packages/flutter_easyrefresh
我以前使用Scroll Controller加载更多功能并且可以正常工作，但是现在我决定添加下拉菜单以刷新。
Earlier I was using Scroll Controller for load more function and that was working but now I decided to add pull down to refresh.
我的代码很长，但是我试图
My code is quite long but I am trying to make it smaller for this question.
Future <List> getData() async{
if(endofrecord == false){
try{
var deviceid = '1234';
var uid = '999';
var bodyss = { "uid" : id, "deviceid": deviceid, "offset": offset};
var url = 'http://192.168.100.4:8080/get-followerdata.php';
// Starting Web API Call.
var response = await http.post(url, body: json.encode(bodyss)).timeout(Duration(seconds: 5),
onTimeout: (){
// throw Exception();
//or you can also
return null;
});
if(response.statusCode == 200){
final data = getFollowingFromJson(response.body);
setState(() {
_inProcess = false;
if(data.count == null){
count = 0;
}else{
offset = offset + 1;
print(offset);
count = data.count;
}
if(data.content.length > 0 && data.content[0].name != 'Empty'){
for (var i in data.content) {
lists.add(i);
}
}else{
nodata = 'No Record Found';
endofrecord = true;
}
});
print(lists.length);
}
}catch(e){
print("Exception Caught: $e");
}
return lists;
}
}
以下是与代码相关的其他小工具。
Here are other widget related to codes.
body: EasyRefresh.custom(
enableControlFinishRefresh: false,
enableControlFinishLoad: true,
controller: _controllers,
header: ClassicalHeader(),
footer: ClassicalFooter(),
onRefresh: () async {
await Future.delayed(Duration(seconds: 2), () {
print('onRefresh');
setState(() {
_count = 2;
getData();
});
_controllers.resetLoadState();
});
},
onLoad: () async {
await Future.delayed(Duration(seconds: 2), () {
print('onLoad');
setState(() {
_count += 2;
getData();
});
_controllers.finishLoad(noMore: _count >= 4);
});
},
slivers: <Widget>[
SliverList(
delegate: SliverChildBuilderDelegate(
(context, index) {
return Container(
//child: Container(
height: MediaQuery.of(context).size.height,
width: MediaQuery.of(context).size.width,
child: Stack(
children: <Widget>[
TabBarView(
controller: _controller,
children: [
// Text("TAB ONE CONTENT"),
Container(
decoration: BoxDecoration(
// borderRadius: BorderRadius.circular(25),
color: Colors.black87,
),
padding: EdgeInsets.only(top: 10, bottom: 5),
height: MediaQuery.of(context).size.height,
width: double.infinity,
child: ListView.builder(
// controller: _scrollcontroller,
itemCount: lists.length,
itemBuilder: (BuildContext context, int index) {
return buildList1(context, index);
}),
),
一旦数据加载到Listview.builder onRefresh或onload函数中没有开火。简而言之，一旦将数据加载到刷新或加载中就不会发生。如果我没有加载数据，那么我可以在加载时看到并下拉刷新。
Once data is loaded in Listview.builder onRefresh or onload function didn't fire. In simple words, once data is loaded onRefresh or on load didn't happen. If I didn't load the data then I can see on load and pull down to refresh is firing.
编辑：
我发现onRefresh正在射击，但我需要将其拖动到屏幕顶部。如果我从中心或底部拖动，则不会触发。用简单的话来说，只要有一个列表视图项就不会触发。
I found that onRefresh is firing but I need to drag it top of the screen. If I drag from center or bottom then it is not firing. In Simple words wherever there is a listview item it is not firing.
编辑2
我怀疑是
return Container(
//child: Container(
height: MediaQuery.of(context).size.height,
width: MediaQuery.of(context).size.width,
child: Stack(
children: <Widget>[
TabBarView(
controller: _controller,
children: [
// Text("TAB ONE CONTENT"),
推荐答案
您需要等待getData（），而不是等待延迟2秒。将来的工作完成后，您应该更改小部件的状态
You need to await for getData(), instead of await delayed 2 seconds. Once the future is completed, you should change the state of your widget
您的代码应该像下面这样：
Your code should we something like:
- 等待getData（）;
- 更新状态
这篇关于Flutter：SliverList中的ListView Builder的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
