In my Flutter project I have besides main.dart a second dart-file (helpers.dart) in which I am trying to use the debugPrint() function:
debugPrint(someString);
I get the following message:
The function 'debugPrint' isn't defined.
Try importing the library that defines 'debugPrint', correcting the name to the name of an existing function, or defining a function named 'debugPrint'.
The official Flutter documentation states that the debugPrint function is part of Flutter's foundation library. But import 'package:flutter/foundation.dart'; did not solve the problem. So which library/ package do I have to import?
Importing the material package solves the problem:
import 'package:flutter/material.dart';
Related
I've a problem that I can't resolve I did a lot of research but nothing.
I need to use the library flutter_countdown_timer but he seems that CurrrentRemainingTime isnt recognized. Someone has already use this library ?
The error code is 'CurrentRemainingTime' isn't a type.enter image description here
Seems like you haven't imported the import statement for the CurrentRemainingTime. There are two import statements, one for CountDownTimer and the other for the CurrentRemainingTime.
Add this import statement:
import 'package:flutter_countdown_timer/current_remaining_time.dart';
I have a set of Swift Packages that I'm writing (ex: CUIExpandableButton), that I'd like to roll up into another Swift Package called CrystalUI. The overall goal is to write a set of packages that get bundled into a single package. However, I want to make it so people can just have one import
import CrystalUI
instead of a series of import statements
import CrystalUI
import CUIExpandableButton
import PreviewKit
...
Is it possible to re-expose an existing library as part of the parent library?
Looks like #_exported Is what I was looking for. Found this article that explains it. It's an unsupported method but it's also used in Alamofire so I think it's safe.
Does someone knows why i gat this error? I have the import 'package:geolocator/geolocator.dart' and 'package:location/location.dart' and also google maps import. I've installed every package.
This means that LocationAccuracy is defined in more than one library, in your case, LocationAccuracy is both in package:geolocator/geolocator.dart and package:location/location.dart. So you need a prefix to specify from which library you are using the LocationAccuracy as Flutter doesn't know from which library should it use. You can add prefix in import like below:
import 'package:geolocator/geolocator.dart' as geolocator; // you can change this to what you want
import 'package:location/location.dart' as locator; // you can change this to what you want
You can then specify the LocationAccuracy you would like to use from the packages with the help of prefix whether it be:
geolocator.LocationAccuracy or locator.LocationAccuracy
When I am importing image library
import 'package:image/image.dart' as img;
import 'package:image/image.dart';
I am getting the error that this import
This happens when same keyword is used by different package at that situation the IDE gets confused and throws this error .
This is how you solve it:
use **img.Image** instead of Image this way you tell the ide which package to import it from. This will generally
solve the issue.
Probably a basic mistake, but the cause is eluding me. I am trying to import a package, but I get an error saying it cannot be found or imported.
First I set the current directory to the parent directory of the package, and this does not work.
Second, the docs say that the parent folder of the package must be added to the matlab path. I tried this, and still no luck.
It is not due to using plot as the package name as I get the same error when trying to import analysis.
What I can do is to import using: import plot.* or import analyse.* and then go on to use the functions in the packages, but I want to use the namespaces (i.e. not use .*).
Edit
I'm having this problem on both versions I have installed: 2015b and 2016a.
The answer is that, somewhat counterintuitively, you don't need to call import at all. The docs state that
The parent of the top-level package folder must be on the MATLAB path.
Which is what your addpath(pwd) does and then state that (emphasis is mine):
All references to packages, functions, and classes in the package must
use the package name prefix, unless you import the package.
Meaning at this stage you should be able to call
analyse.testFunc
If you were to import analyse.testFunc you would then be able to call testFunc without prefacing it with the namespace but since you want to retain the namespace the answer is to not call import at all.