Flutter ChangeNotifierProvider builder is deprecated

Question

I have this code in my main.dart:

main() {
  runApp(
    MultiProvider(
      providers: [
        ChangeNotifierProvider(builder: (context) => Auth()), // /**problem here. builder displayed with strikethrough line**/
      ],
      child: App(),
    ),
  );
}

since about 2 days ago, my visual studio code showing this warning:

so I guess builder parameter on ChangeNotifierProvider is deprecated. I searched everywhere but can't find alternative to this builder parameter. So how to remove these warning? Below is my flutter version using flutter --version command on Windows 10

> flutter --version
Flutter 1.9.1+hotfix.6 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 68587a0916 (3 months ago) • 2019-09-13 19:46:58 -0700
Engine • revision b863200c37
Tools • Dart 2.5.0

For any help, thanks in advance

score 58 · Accepted Answer · answered Nov 29 '19 at 08:21

58

Since provider version 3.2.0 "builder" is marked as deprecated in favor of "create".

More info can be found in the change log

So should do:

ChangeNotifierProvider(create: (context) => Auth())

answered Nov 29 '19 at 08:21

Adelina

10,915
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46

Thanks a lot, it saves my time. – Ronak Patel Aug 19 '20 at 10:37

score 12 · Answer 2 · edited Nov 29 '19 at 08:16

12

you can pass with create as builder.

    return Provider<MyProvider>(
        create: (context) => MyProvider(

        ),
        child: HomePage(),
    );

edited Nov 29 '19 at 08:16

Augustin R

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answered Nov 29 '19 at 08:09

Khadga shrestha

1,120
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thank you for your answer. but I choose @Nuts' answer because his description is clearer – Dika Nov 29 '19 at 09:03

score 6 · Answer 3 · answered Dec 08 '19 at 09:53

6

you can use "create" instead of "builder"

main() {
 runApp(
   MultiProvider(
     providers: [
       ChangeNotifierProvider(create: (context) => Auth()), // /**problem here. 
builder displayed with strikethrough line**/
     ],
     child: App(),
   ),
 );

}

answered Dec 08 '19 at 09:53

Reza Mojed

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1
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1

please delete your answer, because your answer not adding anything to existing answers. @Tabrizapps – Dika Dec 08 '19 at 13:15

Avijit Nagare · Answer 4 · 2020-04-02T04:27:52.267

2

Instead of builder parameter you can use create param with Product() or specific product at Index.

itemBuilder: (ctx, i) => ChangeNotifierProvider(
        create: (context) => products[i],
        child:  ProductItem(),
      ),

Or can be use as Value version:

itemBuilder: (ctx, i) => ChangeNotifierProvider.value(
        value: products[i],
        child:  ProductItem(),
      ),

edited Apr 02 '20 at 04:27

answered Apr 02 '20 at 04:08

Avijit Nagare

8,482
7
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score 2 · Answer 5 · edited May 21 '21 at 17:47

2

You need to use create instead of build because of deprecation.

Wrong code example:

True code example:

edited May 21 '21 at 17:47

ChrisF

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answered Jan 24 '21 at 22:07

canerkaseler

6,204
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38

Flutter ChangeNotifierProvider builder is deprecated

5 Answers5

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