Dart supports both named optional parameters and positional optional parameters. What are the differences between the two? Also, how can you tell if an optional parameter was actually specified? 7 Answers 7
This is my code: @override Widget build(BuildContext context) { return new Material( color: Colors.deepPurpleAccent, child: new Column( mainAxisAlignment: MainAxisAlignment.center, children:<Widget>[new GridView.count(crossAxisCount: _column,children: new List.generate(_row*_column, (index) { return new Center( child: new CellWidget() ); }),)] ) ); } Exception as follows: I/flutter ( 9925): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════ I/flutter ( 9925): The following … Read more
In Android, every single View subclass has a setVisibility() method that allows you modify the visibility of a View object There are 3 options of setting the visibility: Visible: Renders the View visible inside the layout Invisible: Hides the View, but leaves a gap that is equivalent to what the View would occupy if it … Read more
This is what I’m trying to make: In the Flutter docs for Text Fields (https://flutter.io/text-input/) it says you can remove the underline by passing null to the decoration. However, that also gets rid of the hint text. I do not want any underline whether the text field is focused or not. UPDATE: updated accepted answer … Read more
How would you approach adding a splash screen to Flutter apps? It should load and display before any other content. Currently, there is a brief flash of color before the Scaffold(home:X) widget loads. 25 Answers 25
I would like to be able to run functions once a Widget has finished building/loading but I am unsure how. My current use case is to check if a user is authenticated and if not, redirect to a login view. I do not want to check before and push either the login view or the … Read more
Working on my first flutter app. The main app screen doesn’t have this issue, all the texts show up as they should. However in this new screen I’m developing, all the text widget have some weird yellow line / double-line underneath. Any ideas on why this is happening? 14 Answers 14
I’m just starting to get the hang of Flutter, but I’m having trouble figuring out how to set the enabled state of a button. From the docs, it says to set onPressed to null to disable a button, and give it a value to enable it. This is fine if the button continues to be … Read more
I am trying to set a background image for the home page. I am getting the image place from start of the screen and filling the width but not the height. Am I missing something in my code? Are there image standards for flutter? Do images scale based on each phone’s screen resolution? class BaseLayout … Read more
I have 2 screens in my Flutter app: a list of records and a screen for creating and editing records. If I pass an object to the second screen that means I am going to edit this and if I pass null it means that I am creating a new item. The editing screen is … Read more
