update logout feature

Author: duytq94

lib/main.dart

@@ -3,9 +3,11 @@ import 'dart:io';
 
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:firebase_auth/firebase_auth.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_chat_demo/chat.dart';
 import 'package:flutter_chat_demo/const.dart';
+import 'package:flutter_chat_demo/login.dart';
 import 'package:flutter_chat_demo/settings.dart';
 import 'package:google_sign_in/google_sign_in.dart';
 
@@ -39,7 +41,8 @@ class MainScreenState extends State<MainScreen> {
         context: context,
         builder: (BuildContext context) {
           return SimpleDialog(
-            contentPadding: EdgeInsets.only(left: 0.0, right: 0.0, top: 0.0, bottom: 0.0),
+            contentPadding:
+                EdgeInsets.only(left: 0.0, right: 0.0, top: 0.0, bottom: 0.0),
             children: <Widget>[
               Container(
                 color: themeColor,
@@ -58,7 +61,10 @@ class MainScreenState extends State<MainScreen> {
                     ),
                     Text(
                       'Exit app',
-                      style: TextStyle(color: Colors.white, fontSize: 18.0, fontWeight: FontWeight.bold),
+                      style: TextStyle(
+                          color: Colors.white,
+                          fontSize: 18.0,
+                          fontWeight: FontWeight.bold),
                     ),
                     Text(
                       'Are you sure to exit app?',
@@ -82,7 +88,8 @@ class MainScreenState extends State<MainScreen> {
                     ),
                     Text(
                       'CANCEL',
-                      style: TextStyle(color: primaryColor, fontWeight: FontWeight.bold),
+                      style: TextStyle(
+                          color: primaryColor, fontWeight: FontWeight.bold),
                     )
                   ],
                 ),
@@ -102,7 +109,8 @@ class MainScreenState extends State<MainScreen> {
                     ),
                     Text(
                       'YES',
-                      style: TextStyle(color: primaryColor, fontWeight: FontWeight.bold),
+                      style: TextStyle(
+                          color: primaryColor, fontWeight: FontWeight.bold),
                     )
                   ],
                 ),
@@ -183,7 +191,8 @@ class MainScreenState extends State<MainScreen> {
           },
           color: greyColor2,
           padding: EdgeInsets.fromLTRB(25.0, 10.0, 25.0, 10.0),
-          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10.0)),
+          shape:
+              RoundedRectangleBorder(borderRadius: BorderRadius.circular(10.0)),
         ),
         margin: EdgeInsets.only(bottom: 10.0, left: 5.0, right: 5.0),
       );
@@ -196,19 +205,27 @@ class MainScreenState extends State<MainScreen> {
     if (choice.title == 'Log out') {
       handleSignOut();
     } else {
-      Navigator.push(context, MaterialPageRoute(builder: (context) => Settings()));
+      Navigator.push(
+          context, MaterialPageRoute(builder: (context) => Settings()));
     }
   }
 
   Future<Null> handleSignOut() async {
     this.setState(() {
       isLoading = true;
     });
+
+    await FirebaseAuth.instance.signOut();
+    await googleSignIn.disconnect();
     await googleSignIn.signOut();
+
     this.setState(() {
       isLoading = false;
     });
-    Navigator.pop(context);
+
+    Navigator.of(context).pushAndRemoveUntil(
+        MaterialPageRoute(builder: (context) => MyApp()),
+        (Route<dynamic> route) => false);
   }
 
   @override
@@ -264,7 +281,8 @@ class MainScreenState extends State<MainScreen> {
                   } else {
                     return ListView.builder(
                       padding: EdgeInsets.all(10.0),
-                      itemBuilder: (context, index) => buildItem(context, snapshot.data.documents[index]),
+                      itemBuilder: (context, index) =>
+                          buildItem(context, snapshot.data.documents[index]),
                       itemCount: snapshot.data.documents.length,
                     );
                   }
@@ -277,7 +295,9 @@ class MainScreenState extends State<MainScreen> {
               child: isLoading
                   ? Container(
                       child: Center(
-                        child: CircularProgressIndicator(valueColor: AlwaysStoppedAnimation<Color>(themeColor)),
+                        child: CircularProgressIndicator(
+                            valueColor:
+                                AlwaysStoppedAnimation<Color>(themeColor)),
                       ),
                       color: Colors.white.withOpacity(0.8),
                     )