How to select random element from a list in flutter

Question

I created a dart file with the list looks like

class Happylist {
  String imageUrl;

  String url;
  String name;

  Happylist({
    this.imageUrl,
    this.url,
    this.name,
  });
}

List<Happylist> hes = [
  Happylist(
    name: 'somename',
    imageUrl: 'assets/images/someimage.jpg',
    url: 'someweblink',
  ),
  Happylist(
    name: 'somename',
    imageUrl: 'assets/images/someimage.jpg',
    url: 'someweblink',
  ),

And intialized with object named hes, so please help me to create a function in main.dart which generates the random element from that list. When it generates a random element how to access its url.

Ali Bayram · Accepted Answer · 2020-04-26 04:15:13Z

6

Import math library to generate random int;

import 'dart:math';

here is a pseudo list;

List yourList = ["first item", "second item", "third item"];

and then create a random in that will be used as index should be limited max number with the list's size;

int randomIndex = Random().nextInt(yourList.length);

and check the result;

print(yourList[randomIndex]);

edited Apr 26, 2020 at 4:15

answered Apr 26, 2020 at 4:01

Ali Bayram

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9 Comments

Rahul Over a year ago

But my list conatins like this it contains two parameters both image url and url ,so please tell me how to select a random element from list and at the same time by tapping on it ,it should return its url.

Ali Bayram Over a year ago

here is live preview; codepen.io/malibayram91/pen/KKdmMVe

jamesdlin Over a year ago

@Rahul It would help if you provided an example of what your data looks like and what you expect. Given what information you provided in the question ("How to select random element from a list"), this answer would work.

Rahul Over a year ago

this is my code class Happylist { String imageUrl; String url; String name; Happylist({ this.imageUrl, this.url, this.name, }); } List<Happylist> hes = [ Happylist( name: 'somename', imageUrl: 'assets/images/someimage.jpg', url: 'someweblink', ), so i want o select random element from that list .please help me

jamesdlin Over a year ago

@Rahul 1. Put your code in your question, not in a comment. 2. This answer would let you pick a random a Happylist element from hes. If it's not working for you, then you need to say how it doesn't work.

|

Chanaka Weerasinghe · Accepted Answer · 2020-04-26 04:28:35Z

0

Simply do this

List<Happylist> hes = List<Happylist>();

  hes.insert(
      0,
      new Happylist(
          name: 'somename',
          imageUrl: 'assets/images/someimage.jpg',
          url: 'someweblink'));
  hes.insert(
      1,
      new Happylist(
          name: 'somename1',
          imageUrl: 'assets/images/someimage1.jpg',
          url: 'someweblink'));
  hes.insert(
      2,
      new Happylist(
          name: 'somename2',
          imageUrl: 'assets/images/someimage2.jpg',
          url: 'someweblink'));

  var randomHappylist = (hes.toList()..shuffle()).first;
  print(randomHappylist.imageUrl);

check this also

edited Apr 26, 2020 at 4:28

answered Apr 26, 2020 at 4:16

Chanaka Weerasinghe

5,8002 gold badges31 silver badges42 bronze badges

9 Comments

Rahul Over a year ago

means it return a element randomly can i get the url too.

Rahul Over a year ago

this is my code class Happylist { String imageUrl; String url; String name; Happylist({ this.imageUrl, this.url, this.name, }); } List<Happylist> hes = [ Happylist( name: 'somename', imageUrl: 'assets/images/someimage.jpg', url: 'someweblink', ), so i want o select random element from that list .please help me

Chanaka Weerasinghe Over a year ago

wait i will give answer

Rahul Over a year ago

this is my problem i wnt to get the particular image along with on tap that particular url

Chanaka Weerasinghe Over a year ago

hello it can get zeroth insdex

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