Future<bool> vs bool in Flutter

Question

I created an rest api method like below,

  Future<bool> activateAccount(int id, int code) async{
      final body = {"code": '$code'};

      final response = await client.post(
        '$baseUrl/user/account/$id',
        body: body
      );
      if(response.statusCode == 200){
        return true;
      }else return false;
  }

but i can't use this method in if statement like this:

bool a = userApiService.activateAccount(...)
if(a){
   ...
}

because:

A value of type 'Future<bool>' can't be assigned to a variable of type 'bool'.

in what is problem? how to change this method to return it boolean depending on the result of the operation?

I would like to include in my raisedButton if statement:

 child: RaisedButton(
                              onPressed: () {
                                userApiService.activateAccount(sharedPreferences.getInt('newUserId'), int.parse(activeCode));
                                // sharedPreferences.clear();
                              },
                              child: Text("ENTER",
                                  style: TextStyle(color: Colors.white, fontSize: 16.0, fontWeight: FontWeight.bold)),
                              shape:
                                  RoundedRectangleBorder(borderRadius: BorderRadius.circular(40.0)),
                              color: Colors.red,
                            )

Solution

Returning the bool like this shorter than yours;

Future<bool> activateAccount(int id, int code) async {
  final body = {"code": '$code'};

  final response = await client.post('$baseUrl/user/account/$id', body: body);
  return response.statusCode == 200;
}

And to use return value is you need to use await keyword;

bool a = await userApiService.activateAccount(...)
if(a){
   ...
}

for using with your button just add async keyword before curly brackets;

onPressed: () async {
  bool a = await userApiService.activateAccount(...)
  if(a){
   ...
  }
}

Comments

[Admin]

can you show how this bool a = ... can look in function? because I need async

[Mehmet Ali Bayram]

Yes you need async function because you use a Future. For more detail you should put your code, where you use this if (a) , here