Flutter cannot call async function from another class

Question

I am trying to create a simple wrapper for the rest client by facing following issue:

I have an external class:

typedef void Callback(int code, String body);

class HttpClient {
void post(String url, Map<String, String> headers, Map<String, String> params,
   Callback callback) async {
 final encoding = Encoding.getByName('utf-8');

   Response response =
     await post(url, headers: headers, body: params, encoding: encoding);
   callback(200, "lol");
 }
}

My await post(...) is highlighted and says the following error: "The expression here has a type of 'void', and therefore can't be used.

Interesting, that if I change my method to private the highlighting disappears.

I can also declare post as a private function and then call it from another public fuction passing all the same params and it works.

How should I write this function and then call it another place? Thanks!

EDIT

Thanks for @Jack I could find the solution:

import should be

 import 'package:http/http.dart' as http;

And Response response = await post(url, headers: headers, body: params, encoding: encoding);

Should be changed to

 var response =
    await http.post(url, headers: headers, body: params, encoding: encoding);

Gabe · Accepted Answer · 2020-03-11 21:33:05Z

2

The IDE thinks you are referencing your post method instead of http.post as your method returns a void. This can be solved by replacing: await post(...) with await http.post(...). Hope this help! If this doesn't work please leave a comment below.

answered Mar 11, 2020 at 21:33

Gabe

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4 Comments

Gabe Over a year ago

@Igor Skryl , if this solved your problem, please accept as an answer. Thanks :)

Sigmund Over a year ago

thanks for the answer! It says "undefined name 'http'"

Sigmund Over a year ago

I am just little bit confused, because when I used the same method in the State with the same imports it worked

Sigmund Over a year ago

Ok, your post helped, but more explanations should be added

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