fix: dispay error if duration is 0:00:00

lib/components/create_join_dialog.dart

@@ -76,13 +76,13 @@ class CreateJoinBeaconDialog {
                                       .toString()
                                       .substring(0, 8);
                                 },
-                                validator: (value) {
-                                  if (value.startsWith("0:00:00"))
-                                    return "Enter valid duration";
-                                  return null;
-                                },
+                                validator: (value) =>
+                                    Validator.validateDuration(
+                                        value.toString()),
                                 decoration: InputDecoration(
                                     alignLabelWithHint: true,
+                                    errorStyle:
+                                        TextStyle(color: Colors.red[800]),
                                     floatingLabelBehavior:
                                         FloatingLabelBehavior.always,
                                     labelText: 'Duration',

lib/router.dart

@@ -1,5 +1,4 @@
 import 'package:beacon/splash_screen.dart';
-import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:beacon/utilities/constants.dart';
 import 'package:beacon/views/auth_screen.dart';

lib/services/navigation_service.dart

@@ -1,4 +1,3 @@
-import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 
 class NavigationService {

lib/services/validators.dart

@@ -55,4 +55,11 @@ class Validator {
     }
     return null;
   }
+
+  static String validateDuration(String duration) {
+    if (duration.startsWith("0:00:00.")) {
+      return "Duration cannot be $duration";
+    }
+    return null;
+  }
 }

lib/views/auth_screen.dart

@@ -5,7 +5,6 @@ import 'package:beacon/utilities/indication_painter.dart';
 import 'package:beacon/view_model/auth_screen_model.dart';
 import 'package:beacon/views/base_view.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter/services.dart';
 
 class AuthScreen extends StatefulWidget {
   const AuthScreen({Key key}) : super(key: key);

lib/views/hike_screen.dart

@@ -1,7 +1,6 @@
 import 'dart:async';
 import 'package:beacon/components/hike_button.dart';
 import 'package:beacon/queries/beacon.dart';
-import 'package:flutter/rendering.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_config/flutter_config.dart';
 import 'package:fluttertoast/fluttertoast.dart';