fix page pop

lib/pages/connection_page.dart

@@ -1,6 +1,5 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
-import 'package:tuple/tuple.dart';
 import 'package:url_launcher/url_launcher.dart';
 import 'dart:async';
 import '../common.dart';
@@ -164,7 +163,6 @@ class _ConnectionPageState extends State<ConnectionPage> {
                     icon: Icon(Icons.arrow_forward,
                         color: MyTheme.darkGray, size: 45),
                     onPressed: onConnect,
-                    autofocus: _idController.text.isNotEmpty,
                   ),
                 )
               ],

lib/pages/home_page.dart

@@ -29,7 +29,18 @@ class _HomePageState extends State<HomePage> {
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
+    return WillPopScope(
+        onWillPop: () async {
+          if (_selectedIndex != 0) {
+            setState(() {
+              _selectedIndex = 0;
+            });
+          } else {
+            return true;
+          }
+          return false;
+        },
+        child: Scaffold(
           backgroundColor: MyTheme.grayBg,
           appBar: AppBar(
             centerTitle: true,
@@ -50,6 +61,6 @@ class _HomePageState extends State<HomePage> {
             }),
           ),
           body: _pages.elementAt(_selectedIndex),
-    );
+        ));
   }
 }

lib/pages/server_page.dart

@@ -209,7 +209,11 @@ void showLoginReqAlert(String peerID, String name) async {
       builder: (alertContext) {
         DialogManager.reset();
         DialogManager.register(alertContext);
-        return AlertDialog(
+        return WillPopScope(
+            onWillPop: () async {
+              return false;
+            },
+            child: AlertDialog(
               title: Text("Control Request"),
               content: Container(
                   height: 100,
@@ -240,9 +244,9 @@ void showLoginReqAlert(String peerID, String name) async {
                       DialogManager.reset();
                     }),
               ],
-        );
+            ));
       });
-  DialogManager.reset();
+  DialogManager.drop();
 }
 
 class PermissionRow extends StatelessWidget {
@@ -403,7 +407,7 @@ showInputWarnAlert() async {
           ],
         );
       });
-  DialogManager.reset();
+  DialogManager.drop();
 }
 
 void toAndroidChannelInit() {