unable to get future value into Widget widget-CodePudding

i have a list view and i want to get a finishedDate from firebase for every listTile if condition is serving. but i got an error future is not subtype of DateTime

what did i do is:

 @override
    Widget build(BuildContext context) {
        return ListView.builder(
            itemCount: widget.servineraProviders!.length,
            itemBuilder: (context, int currentIndex){
              DateTime? finishedDate;
              String state = widget.servineraProviders![currentIndex].providerState;
              if(state == "Serving")
                finishedDate = getFinishedDate(widget.servineraProviders![currentIndex].providerID);
                return Stack(
                    children: <Widget>[
                        Container(
                            width:double.infinity,
                            color: Colors.grey[50],
                            child: state == "Serving" ? Text(finishedDate.toString) : Text("provider is available")
                        )
                    ],
                );
            },
        );
    }

the finishedDate function is as follows

getFinishedDate(providerID)async {
    DateTime dt = await DatabaseService().getFinishedTimeOfService(providerID);
    return dt;
  }

then the getFinishedTiumeofService:

Future<DateTime> getFinishedTimeOfService(providerID) async {
    DateTime finishedDate = DateTime.now();
    try{
      await ordersCollection
        .where('orderStatus', isEqualTo: 'inprogress')
        .where('providerID', isEqualTo: providerID)
        .get()
        .then((querySnapshot){
          var doc = querySnapshot.docs[0].data() as Map<String, dynamic>;
            DateTime timeArrived =  doc['timeArrived'].toDate();//DateFormat("hh:mm").parse('${data[0].timeArrived}');
            List<String> parts = doc['estimatedTime'].split(':');
            int hours = 0, minutes = 0;
            if(parts.length > 2) hours = int.parse(parts[parts.length - 3]);
            if(parts.length > 1) minutes = int.parse(parts[parts.length -2]);
            Duration d = Duration(hours: hours, minutes: minutes);
            finishedDate = timeArrived.add(d);
        });
        return finishedDate;
    }catch(e){
      print(e.toString());
      return DateTime.now();
    }
  }

CodePudding user response：

You can wrap your Stack widget with Future Builder

CodePudding user response：

wrap your widget with Future Builder

CodePudding user response：

Just wrap your Stack widget with FutureBuilder widget and pass the getFinishedDate method to future property of FutureBuilder

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemCount: widget.servineraProviders!.length,
      itemBuilder: (context, int currentIndex){
        DateTime? finishedDate;
        String state = widget.servineraProviders![currentIndex].providerState;
        return FutureBuilder(
          future: getFinishedDate(widget.servineraProviders![currentIndex].providerID),
          builder: (context, snapshot) {
            if (snapshot.hasData && !snapshot.hasError) {
              return Stack(
                children: <Widget>[
                  Container(
                      width: double.infinity,
                      color: Colors.grey[50],
                      child: Text(snapshot.data.toString)
                  )
                ],
              );
            } else if (snapshot.hasError){
              print(snapshot.error.toString());
              return Text(snapshot.error.toString());
            } else {
              return CircularProgressIndicator();
            }
          }
        );
      },
    );
  }