ساخت اپلیکیشن چت با فلاتر و فایربیس بخش دوم

  final FirebaseAuth _auth = FirebaseAuth.instance;

  final firestoreInstance = FirebaseFirestore.instance.collection("users");

 Stream<QuerySnapshot> _userlist(){

   return firestoreInstance.where('userid',isNotEqualTo: _auth.currentUser.uid).snapshots();
  }

StreamBuilder<QuerySnapshot>(
            stream:_userlist() ,
            builder: (context,snapshot){
              if(!snapshot.hasData){
                return CircularProgressIndicator();
              }
              final List<Users> children = snapshot.data.docs.map((doc) =>
                  Users(doc['name'].toString(),doc['userid'].toString(),doc['email'].toString())
              ).toList();

              return Container(
                child: ListView.builder(
                  itemCount: children.length,
                  itemBuilder: (context,index){
                    return list_row(children[index]);
                  },
                ),
              );
            },
          )

Row(
      children: [
        SizedBox(width:8.0),
        IconButton(icon: Icon(Icons.arrow_back_ios_outlined,color: Colors.white,), onPressed: (){}),
        SizedBox(width: 10.0,),
        CircleAvatar(
          radius: 26.0,
          backgroundColor: Colors.transparent,
          backgroundImage: NetworkImage('http://mrgamification.com/wp-content/uploads/2018/02/cell311_1x.png'),

        ),
        SizedBox(width: 17.0,),
        Column(
          children: [
            Text(widget.user.name,style: TextStyle(color: Colors.white,fontSize: 17.0,
            fontWeight: FontWeight.w700),),
            SizedBox(height: 3.0,),
            Text('Online',style: TextStyle(color: Color(0xffc8c7d4),fontSize: 15.0),)
          ],
        )
      ],
    );

  void Sendmsg(var text) async{

    return firebaseInstance.add({
      "message":text,
      "time":int.parse(_getCurrentTime()),
      "sender": _auth.currentUser.uid,
      "receiver":widget.user.userid,
      "relation": key_relation
    }).then((value) {
      print("Message sent");
    }).catchError((error){
      print("Message failed");
    });
  }

  String _getCurrentTime(){
    var now = DateTime.now();
  var date = "${now.year}${now.month.toString().padLeft(2,'0')}${now.day.toString().padLeft(2,'0')}"
      "${now.hour.toString().padLeft(2,'0')}"
      "${now.minute.toString().padLeft(2,'0')}${now.second.toString().padLeft(2,'0')}";
      return date;
  }

  Stream<QuerySnapshot> _chatlist(){
    return firebaseInstance.where('relation',isEqualTo: key_relation)
        .orderBy('time')
        .snapshots();
  }

 Widget Receiver(var text){
    return Align(
      alignment: Alignment.topLeft,
      child: Container(
          padding: EdgeInsets.symmetric(vertical: 8.0,horizontal: 10.0),
          margin: EdgeInsets.only(left: 10,top: 9.0),
          decoration: BoxDecoration(
              color: Color(0xfff1f0f5),
              borderRadius: BorderRadius.circular(7.0)
          ),
          child:Text(text,style: TextStyle(color: Color(0xff1c3865),fontSize: 18.0),)
      ),
    );

  }