StreamBuilder_Example.dart

StreamBuilder(
          stream: Firestore.instance.collection("catalog").snapshots(),
          builder: (context, snapshot) {
            if (!snapshot.hasData) {
              return Center(
                child: Column(
                  children: <Widget>[
                    CircularProgressIndicator(),
                    Text("Loading . . . "),
                  ],
                ),
              );
            } else {
              return ListView.builder(
                itemCount: snapshot.data.documents.length,
                itemBuilder: (context, index) {
                  return Padding(
                    padding: const EdgeInsets.all(8.0),
                    child: Card(
                      child: Container(
                        child: InkWell(
                          onTap: () {},
                          child: Column(
                            children: <Widget>[
                              ListTile(
                                title: Text(
                                    snapshot.data.documents[index].documentID),
                                subtitle: Text(snapshot
                                    .data.documents[index].data["description"]),
                              ),
                            ],
                          ),
                        ),
                      ),
                    ),
                  );
                },
              );
            }
          },
        ),