Add loading indicator

lib/main.dart

@@ -8,6 +8,7 @@ import 'widgets/returnDestination.dart';
 import 'package:geocoding/geocoding.dart';
 import 'package:geolocator/geolocator.dart';
 import 'package:http/http.dart' as http;
+import 'dart:async';
 import 'dart:convert';
 import 'package:weather_icons/weather_icons.dart';
 import 'config/config.dart';
@@ -90,6 +91,7 @@ class _MyHomePageState extends State<MyHomePage> {
   // Weather API
   var _forecastList = [];
   bool _isCollapsed = false;
+  bool _isLoading = false;
 
   // Format input text.
   String getFormattedText(String inputText) {
@@ -164,9 +166,16 @@ class _MyHomePageState extends State<MyHomePage> {
   // -----------Section For Map Operations, Coords, Polyline..----------------
   // Get shortest path.
   void _getShortestPath() async {
-    _getWeather();
     _resetPolyline();
-    _getDirections();
+
+    _isLoading = true;
+
+    await Future.wait<void>([
+      _getWeather(),
+      _getDirections(),
+    ]);
+
+    _isLoading = false;
   }
 
   // Add markers for origin/dest coords.
@@ -222,7 +231,7 @@ class _MyHomePageState extends State<MyHomePage> {
   }
 
   // Get coords between origin/dest points corresponding to shortest path.
-  void _getDirections() async {
+  Future<void> _getDirections() async {
     _resetPolyline();
     try {
       var originlat = _originCoordinates.latitude;
@@ -682,7 +691,7 @@ class _MyHomePageState extends State<MyHomePage> {
 
   // ----------Section For Getting Weather Data------------
   // Create weather query to the external weather API
-  void _getWeather() async {
+  Future<void> _getWeather() async {
     _forecastList = [];
     setState(() {
       _forecastList;
@@ -1024,7 +1033,7 @@ class _MyHomePageState extends State<MyHomePage> {
                   itemBuilder: (BuildContext context, int index) {
                     return Stack(
                       children: [
-                        Column(
+                        _isLoading ? Center(child: const CircularProgressIndicator()) : Column(
                           children: [
                             Container(
                               margin: EdgeInsets.only(bottom: 15, top: 5),