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QUESTION
I've ran into problem getting UI lags when this line is running:
...ANSWER
Answered 2021-Jun-16 at 00:29I don't believe you can use SharedPreferences within an Isolate without support for MethodChannel / accessing platform-specific underlying OS frameworks on iOS / Android.
You would need to use FlutterIsolate or a similar package to provide that support.
chunhunghan has a good answer detailing this.
Alternatively, you could run the crypt.generateKeys()
by itself in your Isolate.spawn()
call and use the results after in a separate method accessing SharedPreferences
. (Assuming that crypt
package is also not relying on platform-specific code.)
QUESTION
Hello I'm having trouble changing my Logo depending on the Theme. In Dark Theme I can't see the black outlines of my logo, whilst I can on white background in light theme mode.
Here's the main.dart Code Line:
...ANSWER
Answered 2021-Jun-15 at 17:09If you want to change dynamically the asset path, you can check the theme like this
QUESTION
I am having problems restarting the emulator after turning it off. Restarting android studio - doesn't help. Restarting my computer helps. I also cannot find and [stop this process] through the task manager. So that I can not reboot. By the way, the error is displayed with a typo. Help. Who faced such a problem, how to solve it?
...ANSWER
Answered 2021-Jun-15 at 14:21On Windows, the software that runs the Android Emulator is called "qemu-system-x86_64.exe".
Try to kill this software. You can use the built-in taskkill
utility from within the Command Prompt:
- Open the Command Prompt (Type in CMD into the Windows search)
- Enter:
taskkill /F /IM "qemu-system-x86_64.exe" /T
Explanation of the taskkill
command:
QUESTION
I am trying to build a cinema app with flutter. The structure is as follows:
- in each city there are a bunch of cinemas
- in a cinema there are a bunch of showrooms(salle in french)
- in a showroom(salle in french) there are five display sessions or projections, these projections are of the same film.
because the projections are of the same movie (a showroom displays the same movie in different time(e.g projections) by design), when I click on any of the projections in a showroom I should have the same posture of the same film, not a different posture in each projection.
However I get a different film posture in each projection, and I don't know what is causing this.
I am using a rest api that I created with Spring, and I am certain that the problem is not from my back-end because I am using it in an angular web app and it's working perfectly.
This is a layout of my application
this is what happened when I click on two projection of the same showroom( notice that the posture changes when it shouldn't.
and here is the code of the showroom page (salles-page.dart)
...ANSWER
Answered 2021-Jun-15 at 11:53Problem related to back-end and have nothing to do with Flutter.
QUESTION
ANSWER
Answered 2021-Jun-15 at 11:40item
here is a Map
.
QUESTION
So, I have a TextField that looks like:
...ANSWER
Answered 2021-Jun-15 at 11:16I think you need to use focusnode property
https://api.flutter.dev/flutter/material/TextField/focusNode.html
Also please refer to these answers https://stackoverflow.com/a/49912570/9414608 https://stackoverflow.com/a/60510624/9414608
QUESTION
I have a class SocialAuth
, which holds some common properties of the AuthModel
class. Now I want to dynamically update the instance of AuthModel
based on the object of SocialAuth
class.
I'm looping over the .toJson()
of SocialAuth
and trying to update the property of _authModel
(Instance of AuthModel) dynamically.
ERROR IS - The operator '[]=' isn't defined for the type 'AuthModel'.
SocialAuth Class
...ANSWER
Answered 2021-Jun-15 at 10:31You get the error, as the operator []=
isn't defined for the type AuthModel
as the AuthModel
class has not defined the []
operator.
You will need to define the operator []
in the AuthModel
class,
QUESTION
I have following json in my API response :
...ANSWER
Answered 2021-Jun-15 at 08:55I recommend you to use this website to convert your jsons
and so on, to fix you're code you need to change
QUESTION
I'm just working through this whole null-safety mode with my Flutter project and unsure what the difference is with ?
and !
in calls to object methods.
For example, the hint was to add a !
conditional. Here's an example I have right now, and I'm unsure if this should be a ?
or a !
at the findNbr!.replaceAll()
.
ANSWER
Answered 2021-Jun-15 at 05:46I would like to advice you to use the !
operator, also the called bang operator, as little as possible. You should only use this operator when the dart analyser is wrong and you know for 100% that the value will never
be null.
Below is an example of where the dart analyser would be wrong and you should use the bang operator.
QUESTION
I am having trouble trying to iterate over a JSON array of objects from a remote URL using Flutter's FutureBuilder.
My goal is to:
- Fetch JSON data from an API
- Output the data into a 2 column gridview layout
The JSON data is an array of objects(or a List of Maps in dart), the objects have simple string data.
I know that I need to build a future to fetch the data from the API and decode the JSON, then I need to create a FutureBuilder to output the List data into my Gridview Builder. That is what I have tried to do in my code below.
...ANSWER
Answered 2021-Jun-14 at 20:57You have to pass the function like this
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