Category "dart"

How to use Flutter to implement a button like ios virtual home button

I want to create a button can move to any position like iPhone Style (Virtual Home Button) in Flutter but I don't know any packages or any library can do it. Mo

How to use Flutter to implement a button like ios virtual home button

I want to create a button can move to any position like iPhone Style (Virtual Home Button) in Flutter but I don't know any packages or any library can do it. Mo

Refresh indicator doesn't work when list doesn't fill the whole page

I have a page the has a list with refresh indicator. When I have many elements in the list (filling the whole view and more, i.e. I can scroll), the refresh ind

Generate dynamic height horizontal listview nested in a vertical listview

I'm trying to generate a dynamic height HORIZONTAL listview that is nested inside a VERTICAL listview I'm already in the point of printing my horiztonal listvi

How do I fill Matrix4 with translation, skew and scale values in flutter?

Suppose, I have these values for a container of height 200 and width 300: scaleX = 0.9198 scaleY = 0.9198 skewX = -0.3923 skewY = 0.3923 translateX = 150 transl

SliverList inside ExpansionTile without Shrinkwrap (Flutter)

Is there any way to build a SliverList inside ExpansionTile? The reason I want to do this, I have a really large amount of data that needs to be put inside the

How can I filter a stream in Flutter?

I am new to flutter/dart and within this page, I have a list of "information resources" populating the screen with a widget I've created called InformationResou

Dart Generics - type is not a subtype

I'm getting a runtime error from a Dart generic function: Widget card = widget.cardBuilder(item); Which generates: type '(Contact) => Widget' is not a

How can I remove this gray line from ExpansionTile? (Flutter)

How can I remove this gray line from ExpansionTile in flutter? The Code ExpansionTile( title: Text( "Title", style: TextStyle

Mock a Widget in Flutter tests

I am trying to create tests for my Flutter application. Simple example: class MyWidget extends StatelessWidget { @override build(BuildContext context) {

Sort a List in Dart based on how another List was sorted

I am trying to sort a list with reference to another list. Consider this example, List<String> a = ["a", "b", "c"]; List<int> b = [2, 3, 1]; Now,

How to show a progress Dialog before data loading in flutter?

In my Flutter project, I am doing API calls to fetch data by GET request. After parsing the JSON object from the response, I just show the value in the Text wid

How do you catch canLaunch exceptions using url_launcher in flutter?

Using the code from the package I was unable to catch the exception. Note that I would like to catch this specific exception. // from https://pub.dev/packages/

How do I get to tap on a CustomPaint path in Flutter using GestureDetect?

I'm very new to flutter and am trying to figure out how to get a gesture detected on a CustomPaint path. I can click on a host of other things but not on paths

How to get data from firestore document fields in flutter?

I'm trying to test firestore in my flutter-app but I can't really load the data as expected. This is how I get the data: Firestore.instance .collecti

How to generate pseudo-random number in dart

I'm currently trying to pick up a random item in a list in dart. For this, I would like to generate a pseudo-random number (my seed) which will be the index whe

'onRequestPermissionsResult' overrides nothing when requesting access to storage using flutter

I am trying to get permission to access music files in android using onAudioQuery package flutter but it is giving me this error: e: C:\flutter\.pub-cache\hoste

'Null' is not a subtype of type 'Stream<int>' in type cast cubit(Bloc) flutter

I have created a cubit testing project in flutter which is working fine, but when I am writing a UI test case with mockito for the same it is throwing the follo

Is it possible to get current time at compile time for dart/flutter projects?

While writing add to app (Flutter embedding) for a complex iOS app, I run into the issue of sometimes derivedData not deleting properly, or odd things that make

How to add water mark to image when capturing image from camera in Flutter

How can I add watermark/camera name when capturing image from camera in flutter. I want to add current date and time when image is clicked but I'm unable to do