Flutter converting a string into array

Question

I am trying to change a long string text into an array, There are some methods in dart as String.split but its not working in Flutter, is there any solution that I can convert a string by spaces into an array and then use the array in a Listview

Thanks maybe I forgot to add dart Convert package in my code — Wali Seddiqi, Mar 26 '19 at 12:39
Convert? `split()` is a `String` method, what does Convert has to do with it? — pskink, Mar 26 '19 at 12:43

score 28 · Accepted Answer · answered Mar 26 '19 at 13:25

28

After using String.split to create the List (the Dart equivalent of an Array), we have a List<String>. If you wanna use the List<String> inside a ListView, you'll need a Widget which displays the text. You can simply use a Text Widget.

The following functions can help you to do this:

String.split: To split the String to create the List
List<String>.map: Map the String to a Widget
Iterable<Widget>.toList: Convert the Map back to a List

Below a quick standalone example:

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  static const String example = 'The quick brown fox jumps over the lazy dog';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: ListView(
          children: example
              .split(' ')                       // split the text into an array
              .map((String text) => Text(text)) // put the text inside a widget
              .toList(),                        // convert the iterable to a list
        )
      ),
    );
  }
}

answered Mar 26 '19 at 13:25

NiklasPor

9,116
1
45
47

Thanks I will try that it is bit short and seems easier , I wrote it a little different – Wali Seddiqi Mar 26 '19 at 14:26
2

static List Calories=name.split(" "); final foods=List.generate(15,(i)=> "${Myarray[i]} ${Calories[i]}"); body: ListView.builder( itemCount: foods.length, itemBuilder: (context,index){ return ListTile( title: Text('${foods[index]}'), – Wali Seddiqi Mar 26 '19 at 14:26
You may wanna add the code to your question, to clarify your goal and what you have tried! – NiklasPor Mar 26 '19 at 14:47
Okay thank you very much, I wasnt aware of being able to add code into question cuz I am new in here, I will try to add in future – Wali Seddiqi Mar 26 '19 at 16:02
@Niklas, this is exactly what I'm looking for, but I'm trying to split a string everything 2 characters instead of by spaces. Any suggestions? Need this for Dart as well. – Michael Apr 29 '20 at 17:42
1

You could use RegEx and allMatches for splitting it every 2 characters. Or a simple for loop. I'd suggest you search google / whatever for some regex based solution. If you can't find any tell me again @JohnSmithly . – NiklasPor Apr 30 '20 at 08:17

score 2 · Answer 2 · answered May 21 '22 at 03:38

For those who want to convert each character of string into list item, we can

 String username = "John Doe";

 List<String> searchKeywords = List<String>.generate(
          username.length,
          (index) => username[index]); // ['J','o','h','n',' ','D','o','e']

Morever you can remove white spaces using trim() method

Aguda John Omotayo · Answer 3 · 2022-10-24T04:23:14.087

1

List<String> list = "Hello Word".split("");
print(list);
//[H,e,l,l,o, ,W,o,r,l,d]


List<String> list = "Hello World".split(" ");
print(list);
//["Hello", "World"]

edited Oct 24 '22 at 04:23

answered Oct 24 '22 at 04:19

Aguda John Omotayo

11
4

Flutter converting a string into array

3 Answers3

Linked