Parse correctly conversation color

lib/helpers/conversations_helper.dart

@@ -17,6 +17,7 @@ import 'package:comunic/models/new_conversation_message.dart';
 import 'package:comunic/models/new_conversation_settings.dart';
 import 'package:comunic/models/unread_conversation.dart';
 import 'package:comunic/utils/account_utils.dart';
+import 'package:comunic/utils/dart_color.dart';
 import 'package:meta/meta.dart';
 
 /// Conversation helper
@@ -190,7 +191,7 @@ class ConversationsHelper {
         id: map["id"],
         lastActivity: map["last_activity"],
         name: map["name"],
-        color: map["color"],
+        color: map["color"] == null ? null : HexColor(map["color"]),
         logoURL: map["logo"],
         groupID: map["group_id"],
         members: map["members"]

lib/models/conversation.dart

@@ -1,6 +1,7 @@
 import 'package:comunic/helpers/serialization/base_serialization_helper.dart';
 import 'package:comunic/models/conversation_member.dart';
 import 'package:comunic/utils/account_utils.dart';
+import 'package:flutter/material.dart';
 import 'package:meta/meta.dart';
 
 /// Conversation model
@@ -13,7 +14,7 @@ class Conversation extends SerializableElement<Conversation> {
   final int id;
   final int lastActivity;
   final String name;
-  final String color;
+  final Color color;
   final String logoURL;
   final int groupID;
   final List<ConversationMember> members;
@@ -61,7 +62,7 @@ class Conversation extends SerializableElement<Conversation> {
   Conversation.fromJson(Map<String, dynamic> map)
       : id = map["id"],
         name = map["name"],
-        color = map["color"],
+        color = map["color"] == null ? null : Color(map["color"]),
         logoURL = map["logoURL"],
         groupID = map["groupID"],
         lastActivity = map["lastActivity"],
@@ -78,7 +79,7 @@ class Conversation extends SerializableElement<Conversation> {
     return {
       "id": id,
       "name": name,
-      "color": color,
+      "color": color?.value,
       "logoURL": logoURL,
       "groupID": groupID,
       "lastActivity": lastActivity,

lib/ui/tiles/conversation_tile.dart

@@ -71,7 +71,7 @@ class ConversationTile extends StatelessWidget {
         conversation.sawLastMessage ? Icons.check_circle : Icons.lens,
         color: conversation.sawLastMessage
             ? (darkTheme() ? darkAccentColor : null)
-            : Colors.blue,
+            : conversation.color ?? Colors.blue,
       ),
 
       // Conversation information
@@ -79,8 +79,8 @@ class ConversationTile extends StatelessWidget {
       subtitle: Column(
         crossAxisAlignment: CrossAxisAlignment.stretch,
         children: <Widget>[
-          _buildSubInformation(
-              Icons.access_time, diffTimeFromNowToStr(conversation.lastActivity)),
+          _buildSubInformation(Icons.access_time,
+              diffTimeFromNowToStr(conversation.lastActivity)),
           _buildSubInformation(
             Icons.group,
             conversation.members.length == 1

lib/utils/dart_color.dart

@@ -0,0 +1,14 @@
+// https://stackoverflow.com/a/53905427
+import 'package:flutter/material.dart';
+
+class HexColor extends Color {
+  static int _getColorFromHex(String hexColor) {
+    hexColor = hexColor.toUpperCase().replaceAll("#", "");
+    if (hexColor.length == 6) {
+      hexColor = "FF" + hexColor;
+    }
+    return int.parse(hexColor, radix: 16);
+  }
+
+  HexColor(final String hexColor) : super(_getColorFromHex(hexColor));
+}