This problem is introduced when you upgrade Flutter. The reason behind this is you are waiting for some data or running an async function inside main(). I was initialising ScopedModel inside main() and inside that I was awaiting for some data. There is a very small fix. Just run WidgetsFlutterBinding.ensureInitialized() inside void main() , before … Read more
Don’t pass parameters to State using it’s constructor. You should only access the parameters using this.widget.myField. Not only editing the constructor requires a lot of manual work ; it doesn’t bring anything. There’s no reason to duplicate all the fields of Widget. EDIT : Here’s an example: class ServerIpText extends StatefulWidget { final String serverIP; … Read more
In my case I was calling the setState method before the build method had completed the process of building the widgets. You can face this error if you are showing a snackBar or an alertDialog before the completion of the build method, as well as in many other cases. So, in such cases you should … Read more
To use auto wrap, just set maxLines as null: TextField( keyboardType: TextInputType.multiline, maxLines: null, ) If the maxLines property is null, there is no limit to the number of lines, and the wrap is enabled.
You can use Future.delayed to run your code after some time. e.g.: Future.delayed(const Duration(milliseconds: 500), () { // Here you can write your code setState(() { // Here you can write your code for open new view }); }); In setState function, you can write a code which is related to app UI e.g. refresh … Read more
I believe the solutions are the following You actually either: Don’t want to display that ugly back button ( :] ), and thus go for : AppBar(…,automaticallyImplyLeading: false,…); Don’t want the user to go back – replacing current view – and thus go for: Navigator.pushReplacementNamed(## your routename here ##); Don’t want the user to go … Read more
Dart has two types of optional parameters: named and positional. Before I discuss the differences, let me first discuss the similarities. Dart’s optional parameters are optional in that the caller isn’t required to specify a value for the parameter when calling the function. Optional parameters can only be declared after any required parameters. Optional parameters … Read more
You can do with little Trick: Suppose you have requirement of : ( Width,Height ) Wrap_content ,Wrap_content : //use this as child Wrap( children: <Widget>[*your_child*]) Match_parent,Match_parent: //use this as child Container( height: double.infinity, width: double.infinity,child:*your_child*) Match_parent,Wrap_content : //use this as child Row( mainAxisSize: MainAxisSize.max, children: <Widget>[*your_child*], ); Wrap_content ,Match_parent: //use this as child Column( mainAxisSize: … Read more
Check out BoxShadow and BoxDecoration A Container can take a BoxDecoration (going off of the code you had originally posted) which takes a boxShadow return Container( margin: EdgeInsets.only(left: 30, top: 100, right: 30, bottom: 50), height: double.infinity, width: double.infinity, decoration: BoxDecoration( color: Colors.white, borderRadius: BorderRadius.only( topLeft: Radius.circular(10), topRight: Radius.circular(10), bottomLeft: Radius.circular(10), bottomRight: Radius.circular(10) ), boxShadow: … Read more
I want to shed some more light on the actual way of doing a Splash screen in Flutter. I followed a little bit the trace here and I saw that things aren’t looking so bad about the Splash Screen in Flutter. Maybe most of the devs (like me) are thinking that there isn’t a Splash … Read more