Recent questions tagged dart

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dart - How to hide soft input keyboard on flutter after clicking outside TextField/anywhere on screen?

Currently, I know the method of hiding the soft keyboard using this code, by onTap methods of any widget. FocusScope ... in flutter to do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - void Function(int) isn't a valid override of void Function(dynamic)

class Parent<T> { void method(T t) {} } class Child extends Parent { @override void method(int i) {} ... a method vs calling regular methods. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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945 views

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dart - Flutter: Detect keyboard open/close

I have a BottomNavigationBar at the upper-most level of my app. I want to detect keyboard open/close ... from the BottomNavigationBar :-) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - how can we use superscript and subscript text in flutter Text or RichText

i want to show a superscript text but not found any example or can anyone help me with this. I have tried ... not found any method or fields. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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735 views

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dart - Persisting AppBar Drawer across all Pages Flutter

I am trying to create a uniform drawer that is accessible across all pages in my app. How do I make it ... widget in every single dart file? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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880 views

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dart - How to implement drop down list in flutter?

I have a list of locations that i want to implement as a dropdown list in Flutter. Im pretty new to the ... = 'Please choose a location'; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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904 views

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dart - Firebase Login with Flutter using onAuthStateChanged

Outside of Flutter, when I implement firebase authentication I always use the onAuthStateChanged listener ... master/packages/google_sign_in See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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795 views

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dart - Replace initial Route in MaterialApp without animation?

Our app is built on top of Scaffold and to this point we have been able to accommodate most of our routing and ... ) might be in order ;-) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter: Update Widgets On Resume?

In Flutter, is there a way to update widgets when the user leaves the app and come right back to it? My app is ... the time as soon as it can. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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779 views

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dart - How to Deserialize a list of objects from json in flutter

I am using the dart package json_serializable for json serialization. Looking at the flutter documentation it shows ... of a single instance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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dart - Error thrown on navigator pop until : "!_debugLocked': is not true."

When popping a screen navigating to other one by clicking on the showBottomSheet, this error is thrown through the ... , this was the stack: See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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566 views

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dart - How do I share an image on iOS and Android using Flutter?

I would like to share an image using the standard share dialogs in iOS and Android. The code below is mostly ... animated:YES completion:nil]; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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940 views

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dart - how to implement dark mode in flutter

I want to create a flutter app that has 2 light and dark mode themes that change by a switch in-app and ... a simple switch in running time? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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824 views

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dart - What is the difference between "show" and "as" in an import statement?

What is the difference between show and as in an import statement? For example, what's the difference between ... are reported as undefined. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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973 views

1 answer

dart - call method in one stateful widget from another stateful widget - Flutter

I have a flutter project that I am working on I can't put the whole code cause its more than 500 lines of code so I ... () from here?? } ); } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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742 views

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dart - Null aware function invocation operator

In the same way we can have nullableClassInstance?.method(blah) Is there a way to do nullableFunctionInstance?(blah) ... all in one line? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.9k views

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dart - How do I initialize non-nullable members in a constructor body?

I've created my class in Dart this way, but I'm getting the Non-nullable instance field 'text' must be initialized. Try ... this._pos] : ''; } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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696 views

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dart - Polymer querySelector working on DartVM but not in Chrome after compile

Having a weird issue. In my Dart code I have some polymer components on the screen and one of them has a method ... a method on a null element. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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dart - Flutter: How to hide or show more text within certain length

My Container having a description of movies. Initially, I want to show only a few lines of description. And ... , check this JQuery plugin. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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757 views

1 answer

dart - Flutter image preload

Is it possible to preload somehow the image on the app start? Like I have an background image in my drawer but ... so there is no such effect. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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627 views

1 answer

dart - Add JSON serializer to every model class?

When it comes to JSON encoding in Dart, per Seth Ladd's accouncement the finally approved now official way to ... the discussion on Hacker News. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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658 views

1 answer

dart - How to create a service in Flutter to make an app to run always in background?

I would like to make my Flutter application to run always in background. With android, we have to create a ... kind of things with Flutter? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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630 views

1 answer

dart - How to add image in Flutter

I am developing Flutter app for the first time.. I have an issue in adding a image. I have a below ... would be appreciated. Thank you ! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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822 views

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dart - How to make an AlertDialog in Flutter?

I am learning to build apps in Flutter. Now I have come to alert dialogs. I have done them before in Android and ... Q&A so my answer is below. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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967 views

1 answer

dart - Passing data to StatefulWidget and accessing it in it's state in Flutter

I have 2 screens in my Flutter app: a list of records and a screen for creating and editing ... I access recordObject inside _RecordPageState? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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696 views

1 answer

dart - How do I Set Background image in Flutter?

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 ... ") ] ) ) ); } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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658 views

1 answer

dart - How can I dismiss the on screen keyboard?

I am collecting user input with a TextFormField and when the user presses a FloatingActionButton indicating they are done, ... (new MyApp()); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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926 views

1 answer

dart - Flutter: Retrieving top-level state from child returns null

I'm trying to obtain the top-level state of my app using a .of()-method, similar to the Scaffold.of() function. ... this? And how can I fix it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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