I’m currently developing a todo app as taught in this tutorial on Youtube
https://www.youtube.com/watch?v=TclK5gNM_PM
I’m trying to practice fundamentals and decided to make a todo app for an entire week with a Drawer. for that I made some changed in the hive database and created 7 different pages with routes in main.dart.
I have converted the todoList from a list to a map of lists with 7 different lists associated with the respective days in the week.
Here is my code for database.dart after the changes.
import 'package:hive_flutter/hive_flutter.dart';
class ToDoData {
final _myBox = Hive.box('myBox');
Map<String, List> toDoList = {
"monday": [],
"tuesday": [],
"wednesday": [],
"thursday": [],
"friday": [],
"saturday": [],
"sunday": [],
};
void createInitialData(){
toDoList = {
"monday": [["Create a new task.", false]],
"tuesday": [["Create a new task.", false]],
"wednesday": [["Create a new task.", false]],
"thursday": [["Create a new task.", false]],
"friday": [["Create a new task.", false]],
"saturday": [["Create a new task.", false]],
"sunday": [["Create a new task.", false]],
};
}
void loadData(){
var loadedData = _myBox.get("TODOLIST");
if(loadedData != null && loadedData is Map){
toDoList = Map<String, List>.from(
loadedData.map((key, value) => MapEntry(
key as String,
List<dynamic>.from(value).map((e) => e as List).toList(),
)),
);
}
else {
createInitialData();
}
}
void updateData(){
_myBox.put("TODOLIST", toDoList);
}
}
After this, I have the following code to call the toDoTile from all different pages.dart
body: ListView.builder(
itemCount: db.toDoList.length,
itemBuilder: (context, index) {
return ToDoTile(
taskname: db.toDoList[day]![index][0],
taskStatus: db.toDoList[day]![index][1],
onChanged: (value) => checkBoxChanged(value, index),
deleteFunction: (context) => deleteTask(index),
);
},
),
I’m getting exception in the line after navigation. What I mean is that the app starts properly but when I navigate around using the drawer, this exception occurs.
taskname: db.toDoList[day]![index][0];
This is what the exception says
RangeError (RangeError (index): Invalid value: Only valid value is 0: 1)
I’m a beginner and I’ve no idea what is happening. Please help if possible.
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2
Your Map<String,list> was initial
monday": [["Create a new task.", false]],
So that mean your todoList[‘monday’] length gonna be 1 (index 0)
and in your listview it gonna build 7 times because your item count is todoList.length (7)
Idk what you want to do with your listview but if you want to change a day you can try this
body: ListView.builder(
itemCount: db.toDoList.length,
itemBuilder: (context, index) {
return ToDoTile(
taskname: db.toDoList[toDoList.keys.toList()[index]]?[0][0] ?? '',
taskStatus: db.toDoList[toDoList.keys.toList()[index]]?[0][1]?? '',
onChanged: (value) => checkBoxChanged(value, index),
deleteFunction: (context) => deleteTask(index),
);
},
),
ps. this code will show only single task per day you need to imporve that
2
body: ListView.builder(
itemCount: db.toDoList[day]!.length,
itemBuilder: (context, index) {
return ToDoTile(
taskname: db.toDoList[day]![index][0],
taskStatus: db.toDoList[day]![index][1],
onChanged: (value) => checkBoxChanged(value, index),
deleteFunction: (context) => deleteTask(index),
);
},
),