我只想当我单击“赞”按钮时，就像只有一篇帖子一样，请帮助我如何实现此功能，例如“赞”按钮谢谢。
import 'package:assort_project/preferences.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:firebase_database/firebase_database.dart';
import 'package:share/share.dart';
import 'browser.dart';
import 'home_screen.dart';
import 'package:timeago/timeago.dart' as timeago;
class NewsFeedPage extends StatefulWidget {
@override
_NewsFeeds createState() => _NewsFeeds();
}
class _NewsFeeds extends State<NewsFeedPage> {
String _id;
bool liked = false;
var date = new DateTime.fromMillisecondsSinceEpoch(1561092817 * 1000);
final GlobalKey<RefreshIndicatorState> _refreshIndicatorKey =
new GlobalKey<RefreshIndicatorState>();
void getData() {
FirebaseDatabase.instance
.reference()
.child("NewsFeed")
.once()
.then((DataSnapshot snapshot) {
Map<dynamic, dynamic> values = snapshot.value;
values.forEach((key, values) {
print(values["country"]);
});
});
}
@override
void initState() {
super.initState();
getCurrentUser();
}
@override
Widget build(BuildContext context) {
getData();
getCurrentUser();
print(getCurrentUser());
return new Scaffold(
appBar: new AppBar(
title: new Text('News Feed'),
),
drawer: new Drawer(
child: Container(
alignment: Alignment.center,
child: new Column(
children: <Widget>[
Container(
padding: EdgeInsets.only(bottom: 10, right: 5, top: 25),
alignment: Alignment.center,
color: Color(0xffF7F7F7),
child: Column(
children: <Widget>[
Image.asset(
'assets/images/defalut.png',
height: 100,
width: 100,
),
SizedBox(
height: 15.0,
),
Container(
alignment: Alignment.topRight,
child: Row(
// Replace with a Row for horizontal icon + text
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
Icon(Icons.border_color),
SizedBox(
width: 10.0,
),
Text(
"Edit Profile",
style: TextStyle(
color: Colors.black,
fontSize: 15.0,
),
),
],
),
)
],
),
),
Container(
padding: EdgeInsets.all(20),
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
SizedBox(
height: 15.0,
),
Row(
// Replace with a Row for horizontal icon + text
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Icon(Icons.radio),
SizedBox(
width: 10.0,
),
Text(
"News Feed",
style: TextStyle(
color: Colors.black,
fontSize: 15.0,
),
)
],
),
SizedBox(
height: 15.0,
),
InkWell(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => UserBirthBasisPage()),
);
},
child: Row(
// Replace with a Row for horizontal icon + text
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Icon(Icons.settings),
SizedBox(
width: 10.0,
),
Text(
"Preferences",
style: TextStyle(
color: Colors.black,
fontSize: 15.0,
),
)
],
),
),
SizedBox(
height: 15.0,
),
Row(
// Replace with a Row for horizontal icon + text
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Icon(Icons.favorite_border),
SizedBox(
width: 10.0,
),
Text(
"Favorite",
style: TextStyle(
color: Colors.black,
fontSize: 15.0,
),
)
],
),
SizedBox(
height: 15.0,
),
Row(
// Replace with a Row for horizontal icon + text
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Icon(Icons.announcement),
SizedBox(
width: 10.0,
),
Text(
"About us",
style: TextStyle(
color: Colors.black,
fontSize: 15.0,
),
)
],
),
SizedBox(
height: 15.0,
),
InkWell(
onTap: () {
Navigator.pushReplacement(
context,
MaterialPageRoute(
builder: (context) => new LoginScreen()),
);
},
child: Row(
// Replace with a Row for horizontal icon + text
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Icon(Icons.exit_to_app),
SizedBox(
width: 10.0,
),
Text(
"Logout",
style: TextStyle(
color: Colors.black,
fontSize: 15.0,
),
)
],
),
),
],
),
),
],
)),
),
backgroundColor: Color(0xffF7F7F7),
body: StreamBuilder(
stream:
FirebaseDatabase.instance.reference().child("NewsFeed").onValue,
builder: (BuildContext context, AsyncSnapshot<Event> snapshot) {
if (snapshot.hasData) {
Map<dynamic, dynamic> map = snapshot.data.snapshot.value;
map.forEach((dynamic, v) => print(v["imageUrl"]));
return ListView.builder(
itemCount: map.values.toList().length,
itemBuilder: (context, index) {
return nameDropDownList1(
map,
index,
);
},
);
} else {
return Center(child: CircularProgressIndicator());
}
}));
}
Future<String> getCurrentUser() async {
FirebaseUser user = await FirebaseAuth.instance.currentUser();
_id = user.uid.toString();
return user.uid.toString();
}
Future<void> signOut() async {
return FirebaseAuth.instance.signOut();
}
void _likePressed() {
setState(() {
liked = !liked;
});
}
Widget nameDropDownList1(Map map, int index) {
return Column(mainAxisSize: MainAxisSize.min, children: <Widget>[
Flexible(
child: Card(
child: new InkWell(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => ContactUsPage(
map.values.toList()[index]["articleUrl"])),
);
},
child: new Padding(
padding: const EdgeInsets.all(4.0),
child: new Column(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Flexible(
child: Container(
alignment: Alignment.topCenter,
width: double.infinity,
height: 250,
child: Image.network(
map.values.toList()[index]["imageUrl"],
width: double.infinity,
height: 300,
fit: BoxFit.cover,
),
),
fit: FlexFit.loose,
flex: 7,
),
SizedBox(
height: 5,
),
new Flexible(
child: Text(
map.values.toList()[index]["articleTitle"],
textAlign: TextAlign.left,
style: TextStyle(
fontSize: 16,
color: Colors.blue,
fontWeight: FontWeight.bold),
maxLines: 2,
),
flex: 2,
fit: FlexFit.loose,
),
SizedBox(
height: 10,
),
new Flexible(
child: Text(
map.values.toList()[index]["content"],
style: TextStyle(
fontSize: 15,
color: Colors.black54,
),
textAlign: TextAlign.left,
overflow: TextOverflow.ellipsis,
maxLines: 2,
),
flex: 2,
fit: FlexFit.loose,
),
SizedBox(
height: 15,
),
new Flexible(
child: Align(
alignment: Alignment.centerRight,
child: Text(
timeago.format(DateTime.fromMillisecondsSinceEpoch(
map.values.toList()[index]["timeStamp"] * 1000)),
style: TextStyle(
fontSize: 15,
color: Colors.black,
),
textAlign: TextAlign.right,
overflow: TextOverflow.ellipsis,
maxLines: 1,
),
),
flex: 1,
fit: FlexFit.loose,
),
Flexible(
child: new Row(
crossAxisAlignment: CrossAxisAlignment.end,
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
IconButton(
icon: Icon(
liked ? Icons.favorite : Icons.favorite_border,
color: liked ? Colors.red : Colors.black,
),
onPressed: () {
}),
IconButton(
icon: Icon(
Icons.comment,
),
onPressed: () {}),
IconButton(
icon: Icon(
Icons.star_border,
),
onPressed: () {
FirebaseDatabase.instance
.reference()
.child('UserFavouritPoste')
.child(_id)
.push()
.set({
'newsFeedId': map.values.toList()[index]
["NewsFeedId"],
});
}),
IconButton(
icon: Icon(
Icons.share,
),
onPressed: () {
Share.share('check out ' +
map.values.toList()[index]["articleUrl"]);
}),
],
),
fit: FlexFit.loose,
flex: 2,
),
],
),
),
),
),
fit: FlexFit.loose,
flex: 1,
),
]);
}
}
我被困在那里，我们将不胜感激任何帮助或建议。提前致谢。
答案 0 :(得分：0)
您需要将帖子分成单独的小部件。设置后，更改liked属性，该属性对于您正在构建的所有卡都是相同的，这就是所有帖子都被喜欢的原因。如果您将每个帖子都作为单独的小部件，则每个帖子将具有不同的状态。
示例：
return ListView.builder(
itemCount: map.values.toList().length,
itemBuilder: (context, index) {
return PostWidget();
},
);
发布小部件：
class PostWidget extends StatefulWidget {
@override
State<StatefulWidget> createState() {
return _PostWidgetState();
}
}
class _PostWidgetState extends State<PostWidget> {
bool _liked = false;
@override
Widget build(BuildContext context) {
return GestureDetector(
onTap: () {
setState(() { _liked = !_liked; });
},
child: Container(
color: Colors.red,
),
);
}
}