Add an item at bottom in listview in Flutter

Question

I'm making an app similar to to-do's app and i can able to add an item from textfield to listview.builder. In this whenever i add a new item it comes below of the todo's list in listview.builder. Now the problem is i make reverse: true inside listview.builder and if i add an item this time it is coming at the top instead at bottom. How can i display the new item at bottom even if it is reverse: true inside listview.builder.

Answer 1

Say you have a boolean (for reverse) stored in your state, you could then, when adding the item, add it either to the front or the back depending on this value

// State variables
bool isReverse;
List<Todo> todos;

void addListItem(Todo item) {
  if (isReverse) {
    // add to the front of the original array
    todos.insert(0, item);
  } else {
    // add to the back (default case)
    todos.add(item);
  }
}

Though I'd intuitively say that when the list is reversed, you expect new items to end up at the top.

Order example

To illustrate this insertion at index 0 and reverse, I've put the following code and ran it on https://dartpad.dev/

void main() {
  List<String> todos = [];
  
  todos.addAll(['Clean Bedroom', 'Do dishes', 'Cook food']);
  
  print('Normal order: $todos');
  print('Reversed order: ${todos.reversed.toList()}');
  
  // Add item at index 0 (start of the normal list, end of the reversed list)
  todos.insert(0, 'Buy Groceries');
  
  print('Normal order with groceries: $todos');
  print('Reversed order with groceries: ${todos.reversed.toList()}');
}

The output of which is

Normal order: [Clean Bedroom, Do dishes, Cook food]
Reversed order: [Cook food, Do dishes, Clean Bedroom]
Normal order with groceries: [Buy Groceries, Clean Bedroom, Do dishes, Cook food]
Reversed order with groceries: [Cook food, Do dishes, Clean Bedroom, Buy Groceries]

Answer 2

With some more research after posting the question I was able to find a workable solution to the issue. I was wrong assuming that localStorage would work for mobile platform as well. I should have used AsyncStorage to set and get JWT token. This is how I solved the problem:

1. I installed AsyncStorage in my expo project using import AsyncStorage from '@react-native-async-storage/async-storage'.
2. I used AsyncStorage.setItem('loginToken', response.data.token) instead of localStorage.setItem('loginToken', response.data.token).
3. I used const loginToken = await AsyncStorage.getItem('loginToken') instead of const loginToken = await localStorage.getItem('loginToken'). That did the rest. Now I am being able to login from web as well as android simulator and my android phone and being successfully able to fetch the user credentials in authenticated page(s).