NetworkHelper | Network connection module
kandi X-RAY | NetworkHelper Summary
kandi X-RAY | NetworkHelper Summary
Network connection module
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Trending Discussions on NetworkHelper
QUESTION
as I wrote in the title I'm trying to obtain data from a server but the method http.get(Uri.parse(url)) returns empty body and od course the error caused by trying to decode an empty body, But if I copy paste the url used before I can see the json content. How is it possible?
The function I'm using is:
...ANSWER
Answered 2022-Mar-15 at 16:50Thanks all for the support! I've found the issue! Some part of the 'url's String' comes from another call. Inside a variable there was the "hidden chars" \n. That was the cause of the issue -.- I've solved removing all chars except letters before save into variable used for the 'url'. I hope that my English was clear enough to understand.
Bye!
QUESTION
how fetch data async in initstate and then create build method and pass data?
i want get data async from API in initstate and then create build method this is my code:
...ANSWER
Answered 2022-Feb-22 at 22:47Or you could use a FutureBuilder widget, which could just unwrap the data your calling inside that method; you could just return it as a Future of what your data is and the FutureBuilder can take care of it, as in:
QUESTION
I'm trying to test this repository using a unit test with JUnit 4
...ANSWER
Answered 2022-Jan-31 at 03:31I totally forget to emit data inside the flow builder like this
QUESTION
Hi i am working on a weather app i learnt from a course, everything was working fine till i start with the refactoring and it just got complicated the code show no error but when i hot restart the app it crash showing
...ANSWER
Answered 2022-Jan-03 at 05:08in networking.dart you must return like this
QUESTION
I am new to Flutter and generally mobile app development, so sorry if i am making any obvious mistakes . I have a Flutter_map app, and using an API to generate and draw a route with Polylines. I have a button, that when pressed, it enables to set a region to avoid during the routing. I have added a code block to add markers dynamically (second snippet), after the button is pressed, but when i do add them, the previously drawn route dissappears. Also, the lists that are used to contain the data are constantly empty. I suspect setState is responsible for this. Here is part of my code, i excluded some parts, so it can be readable.
...ANSWER
Answered 2021-Dec-22 at 19:11what happens is that you are initializing the lists in the build so every time you call a setState it calls the build and therefore initializes the lists again declare
QUESTION
I'm building an app around a Meals API. First a list of categories will be shown. On selecting a category, meals of the particular category will be displayed. Users can add any meal to favorites. User can see the list of favorites by clicking on the favorites icon at the top. If a user clicks a meal, he gets to see the details of the recipe for that meal. I'm using the same fragment & viewmodel to display the meals based on the category and also the favorite meals. I'm using MVVM with MutableLiveData. The favorites icon is in the activity and I keep on replacing the fragments within the activity.
If I click on the favorites icon from the CategoriesFragment or the FilterByTypeFragment, all the meals added to the favorites are shown correctly. But if I click on the favorites icon when I'm in the RecipeDetailsFragment, it just displays all the meals of that category. That means, it just works like a back press on the RecipeDetailsFragment. When I debug, I see that the fetchFavorites method is being called in the viewmodel when I click on the favorites icon. But what the observer gets at the end is the list of all the meals of the selected category. Why don't I see only the list of favorites when I navigate from RecipeDetailsFragment to the favorites section? I'm posting the code below for your understanding:
...ANSWER
Answered 2021-Nov-01 at 10:47Writing down the discussion in comments in form of a proper answer:
It turned out that the problem was that you were navigating to a destination which was already there in the back stack, and since there was already a ViewModel scoped to that fragment, you received the same instance of viewModel (which already had a isFavorites
field in its constructor.
The problem got solved by removing the old destination from backstack before navigating so that we get a new ViewModel instance.
Adding to that, I would suggest not putting such fields (which are business logic dependent) as a dependency to view models (in your case category
and isFavorites
). Instead you can adopt some other approaches like:
- Pass
category
andisFavorites
as navigation arguments and retrieve them inside ViewModel usingSavedStateHandle
OR - Represent these fields as LiveData or Flow in your ViewModel and react to changes in these values.
QUESTION
I have a viewmodel that looks like this:
...ANSWER
Answered 2021-Oct-15 at 13:50I am not sure about hilt, but I have done this same thing with Dagger2 using AssistedInject. Here is my implementation,
QUESTION
class NetworkHelper {
NetworkHelper(this.urlToConvert);
String urlToConvert;
var url = Uri.parse(urlToConvert);
//Rest of the code omitted
}
...ANSWER
Answered 2021-May-15 at 05:38What you want to use are Initializer Lists
in Dart.
QUESTION
I'm trying to make a weather app with Flutter. But for some reason, the build() method runs before the initState() method finishes. The thing is, all the state variables are initialized using the setState() method inside the initState(), whose variables are to be used in build() method. I guess the problem is that Flutter is trying to access those state variables before the setState() method, which keeps throwing me the error: A non-null String must be provided to a Text widget. I know these codes are too long to read. But I'd appreciate it if you could help me with this.
...ANSWER
Answered 2021-Mar-25 at 06:17if you want to use Future
function in initState
and want it run once and complete before build
, please consider to use WidgetsBinding.instance.addPostFrameCallback
, like
QUESTION
**I have this issue when I was using the get method. And here it is my loading screen contains the error with the first parameter of the http.get method **
...ANSWER
Answered 2021-Mar-04 at 09:22You must use a Uri :
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