RenderFlex children have non-zero flex but incoming height constraints are unbounded in flatter - flutter

Question

I have a page code written in an android studio. On this page, I display a list of objects, as well as a widget to search for these objects. When I clicked on the search widget, I had the following problem: "The following statement was thrown during layout:
RenderFlex is overcrowded 31 pixels below.
The corresponding widget that caused the errors was: "But then I found the answer to this question and added" SingleChildScrollView ".
But then I had this problem: "RenderFlex have non-zero flexibility, but the input height limits are unlimited." . And I can't solve it in any way. I will be grateful for your help. Here is my code:
import 'package:flutter/material.dart';
import 'package:flutter_app_seals/model/post/form_unseals.dart';
import 'package:flutter_app_seals/model/post/form_seals.dart';
import 'package:flutter_app_seals/model/setting/globalvar.dart' as global;
import 'dart:async';
import 'dart:io';
import 'dart:convert';
void main() => runApp(JsonParseObjectSts_UN());
class JsonParseObjectSts_UN extends StatefulWidget {
JsonParseObjectSts_UN() : super();
#override
_JsonParseObjectsState createState() => _JsonParseObjectsState();
}
class _JsonParseObjectsState extends State <StatefulWidget> {
List<UserDetails> _searchResult = [];
List<UserDetails> _userDetails = [];
TextEditingController controller = new TextEditingController();
final String url = global.urlVar ;
// Get json result and convert it to model. Then add
Future<Null> getUserDetails() async {
HttpClient client = new HttpClient();
client.badCertificateCallback = ((X509Certificate cert, String host, int port) => true);
final request = await client
.getUrl(Uri.parse(url))
.timeout(Duration(seconds: 5));
HttpClientResponse response = await request.close();
var responseBody = await response.transform(utf8.decoder).join();
final responseJson = json.decode(responseBody);
setState(() {
for (Map user in responseJson) {
_userDetails.add(UserDetails.fromJson(user));
}
});
}
#override
void initState() {
super.initState();
getUserDetails();
}
Widget _buildUsersList() {
return new ListView.builder(
itemCount: _userDetails.length,
itemBuilder: (context, index) {
return new Card(
color: (_userDetails[index].sealed == "Так") ? Colors.redAccent : Colors.greenAccent,
margin: EdgeInsets.symmetric(vertical: 7),
child: ListTile(
title: Text(
_userDetails[index].name,
style: TextStyle(fontSize: 25),
),
subtitle: Text("Запломбований:${_userDetails[index].sealed}"),
leading: Icon(
Icons.home_outlined,
size: 30,
color: Colors.black87,
),
onTap: () =>
{
if ('Так' == _userDetails[index].sealed) {
global.nameObj = _userDetails[index].name,
global.sealsNumb = _userDetails[index].seal_number,
global.typesOp = 'Так',
Navigator.push(
context,
MaterialPageRoute(builder: (context) => Unseals()),
)
}
else{
{
global.nameObj = _userDetails[index].name,
global.typesOp = 'Ні',
Navigator.push(
context,
MaterialPageRoute(builder: (context) => Form_seals()),
)
}
}
}
),
);
},
);
}
Widget _buildSearchResults() {
return new ListView.builder(
itemCount: _searchResult.length,
itemBuilder: (context, i) {
return new Card(
color: (_searchResult[i].sealed == "Так") ? Colors.redAccent : Colors.greenAccent,
margin: EdgeInsets.symmetric(vertical: 7),
child: ListTile(
title: Text(
_searchResult[i].name,
style: TextStyle(fontSize: 25),
),
subtitle: Text("Запломбований:${_searchResult[i].sealed}"),
leading: Icon(
Icons.home_outlined,
size: 30,
color: Colors.black87,
),
onTap: () =>
{
if ('Так' == _searchResult[i].sealed) {
global.nameObj = _searchResult[i].name,
global.sealsNumb = _searchResult[i].seal_number,
global.typesOp = 'Так',
Navigator.push(
context,
MaterialPageRoute(builder: (context) => Unseals()),
)
}
else{
{
global.nameObj = _searchResult[i].name,
global.typesOp = 'Ні',
Navigator.push(
context,
MaterialPageRoute(builder: (context) => Form_seals()),
)
}
}
}
),
);
},
);
}
Widget _buildSearchBox() {
return new Padding(
padding: const EdgeInsets.all(8.0),
child: new Card(
child: new ListTile(
leading: new Icon(Icons.search),
title: new TextField(
controller: controller,
decoration: new InputDecoration(
hintText: 'Пошук', border: InputBorder.none),
onChanged: onSearchTextChanged,
),
trailing: new IconButton(
icon: new Icon(Icons.cancel),
onPressed: () {
controller.clear();
onSearchTextChanged('');
},
),
),
),
);
}
Widget _buildBody() {
return new Scaffold(
body:Container(
decoration: BoxDecoration(
gradient: LinearGradient(
colors: [Colors.blue, Colors.white],
begin: Alignment.topCenter,
end: Alignment.bottomCenter),
),
child: SingleChildScrollView(
child:Column(
children: <Widget>[
new Container(
color: Theme.of(context).primaryColor, child: _buildSearchBox()),
new Expanded(
child: _searchResult.length != 0 || controller.text.isNotEmpty
? _buildSearchResults()
: _buildUsersList()),
],
),
),
),
);
}
#override
Widget build(BuildContext context) {
return new Scaffold(
body: _buildBody()
);
}
onSearchTextChanged(String text) async {
_searchResult.clear();
if (text.isEmpty) {
setState(() {});
return;
}
_userDetails.forEach((userDetail) {
if (userDetail.name.contains(text) ) _searchResult.add(userDetail);
});
setState(() {});
}
}
class UserDetails {
final String name, seal_number,sealed;
UserDetails({this.name, this.sealed, this.seal_number});
factory UserDetails.fromJson(Map<String, dynamic> json) {
return new UserDetails(
sealed: json['sealed'],
name: json['name'],
seal_number: json['seal_number'],
);
}
}
My scrin:
My scrin when I want to use search: