Pass post details to new page (Firebase in Flutter) - firebase

Multi level Flutter Page
I need to add the functionality of pressing a post card and it loading a more detailed page with that posts information. So far I have developed the listview displaying the post cards and have wrapped them with an InkWell that pushes to the detailed page.
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('Friends')),
body: FutureBuilder(
future: FirebaseFirestore.instance
.collection('posts')
.where('uid', isEqualTo: widget.uid)
.get(),
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.waiting) {
return const Center(
child: CircularProgressIndicator(),
);
}
return ListView.builder(
shrinkWrap: true,
physics: const ScrollPhysics(),
itemCount: (snapshot.data! as dynamic).docs.length,
itemBuilder: (context, index) {
DocumentSnapshot snap =
(snapshot.data! as dynamic).docs[index];
return Container(
decoration: BoxDecoration(
color: Colors.grey.shade300,
borderRadius:
BorderRadius.all(Radius.circular(20))),
padding: const EdgeInsets.all(8.0),
margin: const EdgeInsets.all(8.0),
child: Row(
children: [
InkWell(
child: Container(
padding: EdgeInsets.all(10),
width: 140,
height: 140,
child: ClipRRect(
borderRadius: BorderRadius.circular(10),
child: Container(
child: Material(
child: Ink.image(
image:
NetworkImage(snap['postUrl']),
fit: BoxFit.cover,
child: InkWell(
onTap: () => Navigator.push(
context,
MaterialPageRoute(
builder: (context,) =>
DetailedPage(uid: FirebaseAuth.instance.currentUser!.uid)),
),
)),
))),
),
),

Related

snapshot.data.docs.length not working on flutter

I make some listview and it have likes and comments section. I want to show how many likes and comments that post had. The like section works by displaying the number of users who like it, i try to show it with snapshot.data.docs.length.toString() from firestore but when i try to show how many comments with same code as like section it not working and only get 0.
this is inside comments field
Padding(
padding: const EdgeInsets.only(top: 8),
child: Padding(
padding: const EdgeInsets.only(left: 15),
child: Row(
mainAxisAlignment:
MainAxisAlignment.spaceEvenly,
children: [
Container(
width: 80.0,
child: Row(
mainAxisAlignment:
MainAxisAlignment.start,
children: [
GestureDetector(
onLongPress: () {
Provider.of<PostFunction>(context,
listen: false)
.showLikes(
context,
documentSnapshot
.data()['title']);
},
onTap: () {
print('Adding like...');
Provider.of<PostFunction>(context,
listen: false)
.addLike(
context,
documentSnapshot
.data()['title'],
Provider.of<AuthenticationService>(
context,
listen: false)
.getUserUid);
},
child: Icon(
FontAwesomeIcons.arrowAltCircleUp,
color: kGreyColor,
size: 18.0,
),
),
StreamBuilder<QuerySnapshot>(
stream: FirebaseFirestore.instance
.collection('posts')
.doc(documentSnapshot
.data()['title'])
.collection('likes')
.snapshots(),
builder: (context, snapshot) {
if (snapshot.connectionState ==
ConnectionState.waiting) {
return Center(
child:
CircularProgressIndicator());
} else {
return Padding(
padding:
const EdgeInsets.only(
left: 8.0),
child: RichText(
text: TextSpan(
text: snapshot
.data.docs.length
.toString(),
style: GoogleFonts
.openSans(
color:
kGreyColor,
fontSize: 16.0),
children: <TextSpan>[
TextSpan(
text: ' votes',
style: GoogleFonts
.openSans(
color:
kGreyColor,
fontSize: 16.0,
)),
]),
),
);
}
})
],
),
),
SizedBox(width: 20),
Container(
width: 150.0,
child: Row(
mainAxisAlignment:
MainAxisAlignment.start,
children: [
GestureDetector(
onTap: () {
Provider.of<PostFunction>(context,
listen: false)
.showComments(
context,
documentSnapshot,
documentSnapshot
.data()['title']);
},
child: Icon(
FontAwesomeIcons.solidComments,
color: kGreyColor,
size: 16.0,
),
),
StreamBuilder<QuerySnapshot>(
stream: FirebaseFirestore.instance
.collection(' posts')
.doc(documentSnapshot
.data()['title'])
.collection('comments')
.snapshots(),
builder: (context, snapshot) {
if (snapshot.connectionState ==
ConnectionState.waiting) {
return Center(
child:
CircularProgressIndicator());
} else {
return Padding(
padding:
const EdgeInsets.only(
left: 8.0),
child: Text(
snapshot.data.docs.length
.toString(),
style: GoogleFonts.openSans(
color: kGreyColor,
fontSize: 16.0),
),
);
}
}),
],
),
),
Spacer(),
Provider.of<AuthenticationService>(context,
listen: false)
.getUserUid ==
documentSnapshot.data()['useruid']
? IconButton(
icon: Icon(EvaIcons.moreVertical,
color: kGreyColor, size: 16),
onPressed: () {
Provider.of<PostFunction>(context,
listen: false)
.showPostOptions(
context,
documentSnapshot
.data()['title']);
})
: Container(width: 0.0, height: 0.0)
],
),
),
),

Replace
.collection(' posts')
with
.collection('posts')
in the “comments” section of the Streambuilder.
Your stream data is coming as empty as the database cannot find a collection with name (“ posts”).
So when you try to show how many comments the post had with the same code as the “likes” section it is not working and only getting 0 each time.

just declare the dataType of builder's arguments..i mean, builder:(BuildContext context,AsyncSnapshot snapShot).check the image

Could you please try this one?
StreamBuilder(
stream: firestoreDB,
builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
if (!snapshot.hasData) {
return Center(child: CircularProgressIndicator());
}
return ListView.builder(
itemCount: snapshot.data!.size,
itemBuilder: (context, index) {
return Card(
child: ListTile(
title: Text(snapshot.data!.docs[index]['name']),
subtitle: Text(snapshot.data!.docs[index]['description']),
),
);
},
);
},
),

Horizontal ListView inside SliverAppBar

I am trying to add a Horizontal ListView.builder Inside a SliverAppBar, but every list item appears on top of each other like a traditional list (VERTICLE), when try to change the Scroll direction the whole list disappear.
this is the Items inside SAB
body: SingleChildScrollView(
child: Column(
children: [
CATS(),
Center(
child: Text('خانه های کرایی جدید'),
SizedBox(height: 5),
LatestForRent(),//TO BE SCROLLED HORIZONTAL
SizedBox(height: 5),
Center(
child: Text('خانه های فروشی جدید'),
SizedBox(height: 5),
LatestForSale(), //TO BE SCROLLED HORIZONTAL
SizedBox(height: 5),
Center(
child: Text('خانه های گروی جدید'),
SizedBox(height: 5),
LatestGerawi(),//TO BE SCROLLED HORIZONTAL
this is the List
StreamBuilder(
stream: FirebaseFirestore.instance
.collection('Sell')
.orderBy('TS', descending: true)
.snapshots(),
builder: (context, snapshot) {
if (snapshot.data == null)
return Center(
child: CircularProgressIndicator(
backgroundColor: Colors.red,
valueColor: new AlwaysStoppedAnimation<Color>(Colors.cyan[400]),
),
);
return ListView.builder(
// scrollDirection: Axis.horizontal,
shrinkWrap: true,
itemCount: 2,
itemBuilder: (context, index) => Padding(
padding: const EdgeInsets.all(5.0),
child: Container(
height: 200,
width: 300,

Give an height to your ListView.
StreamBuilder(
stream: FirebaseFirestore.instance
.collection('Sell')
.orderBy('TS', descending: true)
.snapshots(),
builder: (context, snapshot) {
if (snapshot.data == null)
return Center(
child: CircularProgressIndicator(
backgroundColor: Colors.red,
valueColor: new AlwaysStoppedAnimation<Color>(Colors.cyan[400]),
),
);
return Container(
height: 200,
child:ListView.builder(
scrollDirection: Axis.horizontal,
shrinkWrap: true,
itemCount: 2,
itemBuilder: (context, index) => Padding(
padding: const EdgeInsets.all(5.0),
child: Container(
height: 200,
width: 300,
)));

Flutter/Firebase - Merge 2 streams and utilise result in PageView Builder

I am trying to take two streams of data from firebase and merge them into one, then use in my PageView builder in my flutter app. I have managed to get my first stream working (default occasions) but I now need to add another. Here are the two streams:
Stream<QuerySnapshot> getDefaultOccasions(BuildContext context) async*{
yield* Firestore.instance.collection('datestoremember').document('default').collection('Dates_to_Remember').snapshots();
}
Stream<QuerySnapshot> getPersonalOccasions(BuildContext context) async*{
final uid = await Provider.of(context).auth.getCurrentUID();
yield* Firestore.instance.collection('datestoremember').document(uid).collection('Dates_to_Remember').snapshots();
}
I'm not sure the best way to merge the two streams together and then use the result in a Page View Builder:
child: StreamBuilder(
stream: getDefaultOccasions(context),
builder: (context, snapshot) {
if(!snapshot.hasData) return const Text("Loading...");
return new PageView.builder(
itemCount: snapshot.data.documents.length,
controller: PageController(viewportFraction: 0.5),
onPageChanged: (int index) => setState(() => _index = index),
itemBuilder: (_, i) {
return Transform.scale(
scale: i == _index ? 1 : 0.5,
child: Card(
elevation: 6,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10)),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(snapshot.data.documents[i]['Date'].toDate().day.toString()),
Text(DateFormat.MMMM()
.format(
formatter.parse(snapshot.data.documents[i]['Date'].toDate().toString()))
.toString()),
Padding(
padding: const EdgeInsets.only(
left: 8.0, right: 8.0),
child: FittedBox(
fit: BoxFit.contain,
child: Text(
snapshot.data.documents[i]['Title'],
overflow: TextOverflow.ellipsis,
),
),
)
],
),
),
);
},
);},
),
Here is all the code:
class AccountPage extends StatefulWidget {
#override
_AccountPageState createState() => _AccountPageState();
}
class _AccountPageState extends State<AccountPage> {
List<Category> _categories = [
Category('My History', Icons.history, MyHistory()),
Category('Dates to Remember', Icons.event_note, DatesToRemember()),
Category('Terms and Conditions', Icons.assignment, TermsandConditions()),
Category('Privacy Notice', Icons.security, PrivacyNotice()),
Category('Rate us', Icons.stars, RateUs()),
Category('Send us Feedback', Icons.feedback, GiveUsFeedback())
];
DateFormat formatter = DateFormat('dd-MM-yyyy');
int _index = 0;
#override
Widget build(BuildContext context) {
return SingleChildScrollView(
scrollDirection: Axis.vertical,
child: Column(
children: [
Container(
child: SizedBox(
height: 75, // card height
child: StreamBuilder(
stream: getDefaultOccasions(context),
builder: (context, snapshot) {
if(!snapshot.hasData) return const Text("Loading...");
return new PageView.builder(
itemCount: snapshot.data.documents.length,
controller: PageController(viewportFraction: 0.5),
onPageChanged: (int index) => setState(() => _index = index),
itemBuilder: (_, i) {
return Transform.scale(
scale: i == _index ? 1 : 0.5,
child: Card(
elevation: 6,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10)),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(snapshot.data.documents[i]['Date'].toDate().day.toString()),
Text(DateFormat.MMMM()
.format(
formatter.parse(snapshot.data.documents[i]['Date'].toDate().toString()))
.toString()),
Padding(
padding: const EdgeInsets.only(
left: 8.0, right: 8.0),
child: FittedBox(
fit: BoxFit.contain,
child: Text(
snapshot.data.documents[i]['Title'],
overflow: TextOverflow.ellipsis,
),
),
)
],
),
),
);
},
);},
),
),
),
// SizedBox(height: 100.0,),
Container(
// Page Options
height: MediaQuery
.of(context)
.size
.height * 0.7,
child: ListView.builder(
itemCount: _categories.length,
itemBuilder: (context, index) {
return Column(
children: <Widget>[
ListTile(
leading: Icon(
_categories[index].icon,
color: Colors.black,
),
title: Text(_categories[index].name),
trailing: Icon(Icons.arrow_forward_ios),
onTap: () =>
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
_categories[index].route)),
),
Divider(), // <-- Divider
],
);
}),
),
],
),
);
}
}
Stream<QuerySnapshot> getDefaultOccasions(BuildContext context) async*{
yield* Firestore.instance.collection('datestoremember').document('default').collection('Dates_to_Remember').snapshots();
}
Stream<QuerySnapshot> getPersonalOccasions(BuildContext context) async*{
final uid = await Provider.of(context).auth.getCurrentUID();
yield* Firestore.instance.collection('datestoremember').document(uid).collection('Dates_to_Remember').snapshots();
}

You can Merge your two Streams like this:
StreamGroup.merge([getDefaultOccasions(context), getPersonalOccasions(context)]).asBroadcastStream();

How to get data from other collection in streambuilder

I am facing a problem and I cannot solve it, I have a collection "Posts" that contain users' posts, each post contains a uid of the owner of the post, and I have another collection named "users", and each user has his name and photo, I want to get the user's name and image to display on his post.
Posts Collection
Users Collection
I have seen this article but I did not benefit perhaps because I am a beginner.
My Code:
StreamBuilder(
stream: Firestore.instance
.collection('Posts')
.orderBy('date', descending: true)
.snapshots(),
builder: (context, snapshot) {
if (!snapshot.hasData) {
const Text('Loading...');
} else {
return ListView.builder(
physics:
NeverScrollableScrollPhysics(),
shrinkWrap: true,
scrollDirection: Axis.vertical,
itemCount: snapshot
.data.documents.length,
itemBuilder: (context, index) {
DocumentSnapshot mypost =
snapshot
.data.documents[index];
return Stack(
children: <Widget>[
Container(
decoration:
BoxDecoration(
borderRadius:
BorderRadius
.circular(
15.0),
),
child: Padding(
padding:
EdgeInsets
.all(8.0),
child: Column(
children: <
Widget>[
InkWell(
child: Row(
children: <
Widget>[
Container(
width:
32.0,
height:
32.0,
decoration: BoxDecoration(shape: BoxShape.circle, image: DecorationImage(fit: BoxFit.fill, image: NetworkImage(
// user image url
'Owner of post img')))),
SizedBox(
width:
10.0,
),
Text(
'Owner of post Name',
style: TextStyle(
color: Colors.white,
fontSize: 12.0,
fontWeight: FontWeight.bold,
fontFamily: 'BalooDa2'),
),
],
),
),
Padding(
padding:
EdgeInsets.all(
5.0),
child: Text(
'${mypost['text']}',
style: TextStyle(
color: Colors
.white,
fontSize:
16.0,
fontFamily:
'Tajawal',
height:
1.3),
textAlign:
TextAlign
.justify,
textDirection:
TextDirection.rtl),
),
],
),
),
),
],
);
});
}
return Container(
height: 0.0,
width: 0.0,
);
},
),

You can user nested StreamBuilders to fetch user detail from the uid you are getting from posts collection.I have added a query which will match uid from posts data and look for the documents in users collection where uid is equal to uid from posts collection.
StreamBuilder(
stream: Firestore.instance
.collection('Posts')
.orderBy('date', descending: true)
.snapshots(),
builder: (context, snapshot) {
if (!snapshot.hasData) {
const Text('Loading...');
} else {
return ListView.builder(
physics:
NeverScrollableScrollPhysics(),
shrinkWrap: true,
scrollDirection: Axis.vertical,
itemCount: snapshot
.data.documents.length,
itemBuilder: (context, index) {
DocumentSnapshot mypost =
snapshot
.data.documents[index];
return Stack(
children: <Widget>[
Container(
decoration:
BoxDecoration(
borderRadius:
BorderRadius
.circular(
15.0),
),
child: Padding(
padding:
EdgeInsets
.all(8.0),
child: Column(
children: <
Widget>[
StreamBuilder(
stream: Firestore.instance
.collection('users')
.where('uid', isEqualTo: mypost['uid'])
.snapshots(),
builder: (context, snapshot){
switch (snapshot.connectionState) {
case ConnectionState.waiting:
return SizedBox();
case ConnectionState.active:
default:
break;
}
if (snapshot.hasError) print(snapshot.error);
DocumentSnapshot user = snapshot.data.documents[0];
return InkWell(
child: Row(
children: <
Widget>[
Container(
width:
32.0,
height:
32.0,
decoration: BoxDecoration(shape: BoxShape.circle, image: DecorationImage(fit: BoxFit.fill, image: NetworkImage(
// user image url
'${user['uimg']}')))),
SizedBox(
width:
10.0,
),
Text(
'${user['name']}',
style: TextStyle(
color: Colors.white,
fontSize: 12.0,
fontWeight: FontWeight.bold,
fontFamily: 'BalooDa2'),
),
],
),
);
},
),
Padding(
padding:
EdgeInsets.all(
5.0),
child: Text(
'${mypost['text']}',
style: TextStyle(
color: Colors
.white,
fontSize:
16.0,
fontFamily:
'Tajawal',
height:
1.3),
textAlign:
TextAlign
.justify,
textDirection:
TextDirection.rtl),
),
],
),
),
),
],
);
});
}
return Container(
height: 0.0,
width: 0.0,
);
},
),

Flutter: Do FutureBuilder Loads everything at the same time?

My app has a book summaries Feature, Now since I don't have money to host an API, I am using Firebase/Firestore database where I add summaries manually and then retrieve data from firebase to App.
I am using FutureBuilder for it.
Now say I have 10 summaries will FutureBuilder first load all 10 of them and then display data on screen(which is a ListView.builder and can show only 2 summaries without scrolling) or it will load only the data which need to be painted on the screen just like simple ListView.builder.
// code to retrieve data:
Future<QuerySnapshot> getFeedsfromFb() async {
var data = await Firestore.instance
.collection('feedItem')
.orderBy('feedId', descending: true).getDocuments();
return data;
}
// building widget:
Widget feed() {
return Container(
width: deviceWidth,
height: deviceHeight / 3,
child: FutureBuilder(
future: getFeedsfromFb(),
builder: (BuildContext context, AsyncSnapshot snapshot) {
if (snapshot.hasData) {
return ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: snapshot.data.documents.length > 10
? 10
: snapshot.data.documents.length,
itemBuilder: (BuildContext context, int index) {
return Container(
width: deviceWidth / 2.5,
child: GestureDetector(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (BuildContext context) => FeedIntro(
snapshot.data.documents[index]['feedId'])));
},
child: Card(
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Container(
// width: 150,
height: 150,
foregroundDecoration: BoxDecoration(
image: DecorationImage(
image: NetworkImage(
snapshot.data.documents[index]['feedImage'],
),
fit: BoxFit.fill)),
),
Center(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Text(snapshot.data.documents[index]['title']),
)),
],
)),
),
);
},
);
} else if (snapshot.hasError) {
return Center(child: Text('Sorry Something went wrong!'));
} else {
return Center(
child: SizedBox(
child: CircularProgressIndicator(),
width: 50,
height: 50,
),
);
}
}),
);
}

Your FutureBuilder will load all items at the same, but only needed data by ListView.builder will be painted on the screen.

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