demo.dart

import 'package:flutter/material.dart';

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/rendering.dart';

class History extends StatefulWidget {
  @override
  _HistoryState createState() => _HistoryState();
}

class _HistoryState extends State<History> {
  var fsconnect = FirebaseFirestore.instance;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black,
      appBar: AppBar(
        backgroundColor: Colors.black26,
        title: Text(
          'Command History',
        ),
      ),
      body: SafeArea(
        child: SingleChildScrollView(
          child: Container(
            child: StreamBuilder<QuerySnapshot>(
              stream: fsconnect.collection('terminal_outputs').snapshots(),
              builder: (context, snapshot) {
                if(snapshot.data == null) return CircularProgressIndicator();
                var msg = snapshot.data.docs;
                List<Widget> y = [];
                for (var d in msg) {
                  var commandName = d.data()['commandName'].toString();
                  var commandOutput = d.data()['commandOutput'].toString();
                  print(commandName);
                  var comm = FutureBuilder(
                    future: getData("kYS7uQdqxVHwqEggtHcW"),
                    builder: (BuildContext context, AsyncSnapshot<String> snapshot){
                      Widget widget;
                      if (snapshot.connectionState == ConnectionState.done) {
                        widget = Text(
                          snapshot.data,
                          style: TextStyle(
                            color: Colors.white,
                          ),
                        );
                      } else {
                        widget = CircularProgressIndicator();
                      }
                      return widget;
                    },
                  );
                  y.add(comm);
                }
                return Container(
                  child: Column(
                    children: y,
                  ),
                );
              },
            ),
          ),
        ),
      ),
    );
  }
  Future<String> getData(String Id) async {
    var workoutData;
    await fsconnect.collection("terminal_outputs").doc(Id).get().then((value) {
      // Getting data from the document from another collection
      workoutData = value.data();
    });
    // retrieving data from particular field
    var data = await workoutData["timestamp"];
    print("workoutData: $workoutData");
    print("data is:: $data");
    return data;
  }
}