我有一个网格视图构建器，但我的问题是，当数据库中没有数据时，它仍然返回一个我设置为包含数据的容器，如果有数据，它不会根据数据库中的数据复制容器，它仍然只返回一个容器，我什至将它设置为创建一个小部件，如果它找不到数据，它会说没有数据，但如果我从集合中删除所有数据，它仍然没有显示
这是我的代码
import 'package:flutter/material.dart';
import 'package:flutter_bounce/flutter_bounce.dart';
import 'package:swipe_to/swipe_to.dart';
import 'package:page_indicator/page_indicator.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
class HomeScreen extends StatefulWidget {
@override
Home createState() => Home( );
}
class Home extends State<HomeScreen> {
String user_id = "2467046743";
checkCategories() {
var docSnapshot = FirebaseFirestore.instance
.collection('categories').where('id',isEqualTo:user_id.toString()).snapshots();
print ("found data on cloudstore "+docSnapshot.toString());
return docSnapshot;
}
bool step1 = true;
bool step2 = false;
@override
void initState() {
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Color(0xff0B0B0B),
body:
Stack(
children: <Widget>[
SafeArea(child:
/* PageIndicatorContainer(
align: IndicatorAlign.bottom,
length: 2,
indicatorSpace: 5.0,
padding: EdgeInsets.only(bottom: MediaQuery.of(context).size.height*6.5/100 + 7,),
indicatorColor: Colors.white,
indicatorSelectorColor: Color(0xff00bdf4),
shape: IndicatorShape.circle(size: 6),
child:*/ PageView(
children: <Widget>[
Container( color: Color(0xff0B0B0B),
child:
Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Center(child:Container( margin: EdgeInsets.only(top:10), width: MediaQuery.of(context).size.width*90/100, height: 50,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(5),
color: Color(0xff323336),
),
child: TextField( style: TextStyle(
color: Color(0xfffA3A3AB),
fontFamily: 'Montserrat',
fontSize: 20,
fontWeight: FontWeight.w500),
decoration: InputDecoration( contentPadding: const EdgeInsets.only(top:13,left:0),
prefixIcon: Padding(
padding: const EdgeInsets.all(10.0),
child:Transform.scale(
scale: 1.2,
child: Image.asset(
'assets/images/search.png',
width: 10,
height: 10,
fit: BoxFit.contain,color: Color(0xff90939A),
)),
), suffixIcon: Padding(
padding: const EdgeInsets.all(10.0),
child:Transform.scale(
scale: 1.0,
child: Image.asset(
'assets/images/bar_code_scanner.png',
width: 20,
height: 20, color: Color(0xff989EA4),
fit: BoxFit.contain,
),
)),
border: InputBorder.none,
hintText: 'Search', hintStyle: TextStyle(
color: Color(0xffBABABD),
fontSize: 19,
fontWeight: FontWeight.w500)
),
) )),
Container( height:MediaQuery.of(context).size.height *90/100,
decoration: BoxDecoration(
),
child: Stack(
children: <Widget>[
Container(color: Color(0xff0B0B0B),
child: SingleChildScrollView(
child: ConstrainedBox(
constraints: BoxConstraints(
minHeight: MediaQuery.of(context).size.height,
),
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
StreamBuilder(
stream: checkCategories(),
builder: (context, snapshot) {
if (snapshot.hasData) {
if (snapshot.data.documents.isEmpty) {
print("noooooooooooooooooooooooooooooooooooooooooooooooooo");
return Text("No Data Found");
}
else if(snapshot.data.documents.isNotEmpty){
print("yessssssssssssssssssssssssssssssssssssssssssssssssssss");
return GridView.builder(
shrinkWrap: true,
itemCount: snapshot.data.documents.length,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
childAspectRatio: 1.7,
crossAxisCount:2),
itemBuilder: (BuildContext context, int index) {
DocumentSnapshot thesnapshot = snapshot.data.docs[index];
return Container( margin:EdgeInsets.only(left:25,right:25, top:20),height: 200,decoration: BoxDecoration(
color: Color(0xff1e82d2),
borderRadius: BorderRadius.circular(5),));
},
);
}
}
return Container();
})