Recent questions tagged dart

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dart - Detect vertical swipe direction in Flutter

How to detect when the user swipe vertically either upward on downward? I have been using swipedetector package, but now, it gives me exceptions like The getter 'globalPosition' was called on null. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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820 views

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dart - How do I access metadata annotations from a class?

I have a Dart class that is annotated with metadata: class Awesome { final String msg; const Awesome(this.msg); String toString() => msg; } @Awesome('it works! ... and if so, with what. How do I do that? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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790 views

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dart - Dartlang with polymer character encoding

I wrote a snippet and not working with national characters. The "A t?rzsszám"... text appear "t??rzssz??m" with my loginstatus field. Main html: <!DOCTYPE html> ... ?l áll!'; } else { What can I do... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - js interop compiled with dart2js error - Uncaught NoSuchMethodError : method not found:

I generated a sample Polymer web project. Added following js file. jslib.js function testfunction() { alert("test"); } in clickcounter.dart I added ... /out/web/testrun.html_bootstrap.dart.js:12963:17) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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636 views

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dart - How to parse JSON only once in Flutter

I am making an app which takes values through JSON parsing. My app has multiple tabs but each time im swiping between tabs, the JSON sends a new ... Fourth.dart? Any assistance is very much appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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633 views

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dart - How to programmatically clear PaperInput and have the floating label drop down to the input line

I have the following markup: <paper-input id="alias-input" floatingLabel label="Person Alias (eg: King, Eldest Son, Mooch, etc.)"></paper-input> < ... do that. Is there some other call to achieve this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Unhandled Exception: PlatformException(sign_in_failed, com.google.android.gms.common.api.ApiException: 10: , null)

Before mark it as duplicate please read the question. I have set both SHA1 and SHA256 in my google console. I have tried many way but still facing error. ... and other so many. Where I'm still missing ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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668 views

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dart - Custom width/height property for a widget are ignored

Sometimes I want to force a widget to take a specific size, which I usually do by using a SizedBox/ConstrainedBox/Container But I've realized that ... is that? Example: Expected behavior: Actual behavior: See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

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dart - Flutter populate dropdown button from json array

How do I populate this JSON list into dropdown button? { "status": true, "message": "success", "data": { "list": [ { "idattribute": "2", "attrName": " ... ": "1", "attrName": "FRUIT JUICE" } ] } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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521 views

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dart - How do I pass multiple entry_points to polymer transformer in pubspec.yaml?

Now that pub build supports building Polymer apps, how do I pass multiple entry_points to the Polymer transformer in my pubspec.yaml file? When I try ... : web/index.html entry_points: web/reports.html See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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875 views

1 answer

dart - Flutter: Is it possible to click through a PageView?

Trying to make widgets behind a PageView clickable by wrapping it around a GestureDetector but it doesn't work. Is there another way I can do ... _pageController, children: _buildForegroundPages(), ), ), See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

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dart - Format time labels in charts_flutter time series chart

I have implemented a time series chart in my flutter app which displays energy data over time: final List<charts.Series<TimeSeriesEnergy, DateTime>> seriesList ... do this. Any suggestions are welcome :) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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906 views

1 answer

dart - Flutter: Test that a specific exception is thrown

in short, throwsA(anything) does not suffice for me while unit testing in dart. How to I test for a specific error message or type? Here is ... () => operations.lookupOrderDetails(), throwsA(MyCustErr)); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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788 views

1 answer

dart - Keep the bottom navigation bar in every screens flutter

I have this bottom navigation bar with center docked floating icon,the bottom bar is present and i can go through the tab elements in bottombar but i need to show the ... ) => new LoginScreen(), }, ); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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879 views

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dart - Dartium displays blank page

my Dartium web browser suddenly stopped displaying the content of Polymer application. Even the basic dart-polymer template project (that reversing of text) is ... etc. Hopeless... Thanks for ideas Rene See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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663 views

1 answer

dart - Unwanted space appearing between RaisedButton widgets in a column

tl;dr Why is space appearing between my two buttons when I have not explicitly set any? I am trying to make a layout like the one below: However, what ... ), ), child: Builder(builder: super.build)); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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778 views

1 answer

dart - flutter return future list in a var to use outside the loop

Hello I'm trying to recuperate the list value of a database. i can but what i want is to export the result in a var so i can use in all my code just by ... '] as String, ); } } can i have help please ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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739 views

1 answer

dart - how to display images and text on it in listview flutter?

i want to display a images and text in listview. Data is parsed and set it in model class. can you please help me out. Below is my class. import ' ... , webstiteURL: json['website_url'] as String, ); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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739 views

1 answer

dart - How to design a Text Widget that wraps automatically in flutter?

I want to design a text widget that wraps automatically, and it uses an ellipsis when the text length exceeds the maximum. The following code can achieve a ... size of parent. How can I improve the code? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

1 answer

dart - Clear state in Flutter when using Provider

How can I clear the current state of my providers manually in my Flutter app? The use case I have is when a user signs out of my app then ... it is cleared automatically when the app is restarted however. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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862 views

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dart - Flutter firebase validation of form field inputs

I'm new to Flutter and Firebase and I am trying to validate user input from a form and run it up against a the firebase collection. I ask users ... call (ideally, without having to build another widget)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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769 views

1 answer

dart - How do I convert an image to base64 and base64 to image? The way I do it doesn't work

This is an example code. var image = await ImagePicker.pickImage(source: ImageSource.camera); var stringBytes = base64.encode(image.readAsBytesSync()); var bytes = ... I am going to add it in a database. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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638 views

1 answer

dart - Can I put ng-if directive on an element which also binds to a controller

I was wondering in case I have a controller and ng-if directive on the same element as in <div foo ng-if= ctrl.visible >You can see me</div> and a ... Should I see the text You can see me" or not? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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936 views

1 answer

dart - Making Private Route in Flutter

How can I make a wrapper over my private routes, which navigate to screen only when user is authorized, otherwise redirect to login and get back to ... just reuse it on my other Private future screens? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.6k views

1 answer

dart - Flutter failed for task app:mergeDebugNativeLibs and app:mergeDebugJavaResource

FAILURE: Build completed with 2 failures. 1: Task failed with an exception. What went wrong: Execution failed for task ':app:mergeDebugNativeLibs'. A ... Gradle task assembleDebug failed with exit code 1 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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985 views

1 answer

dart - Flutter: Change status bar color in iOS

I want to change status bar color with package:flutter/services.dart package but it doesn't work. I am using Mac and iOS simulator: Mojave 10.14.6 iOS 12.2 ... ? U.P.D. This issue starts to drive my nuts. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

1 answer

dart - How to post x-www-form-urlencoded in Flutter

I am trying to send a POST request to an API to create an account. The request is working well, it should look like this : Bulk Edit Mode : Key-Value ... on /app/createUser... ('/app/' is in BASE_URL) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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840 views

1 answer

dart - Matching Unicode letters with RegExp

I am in need of matching Unicode letters, similarly to PCRE's p{L}. Now, since Dart's RegExp class is based on ECMAScript's, it doesn't have the ... φ or ?, they should match if they are actual letters. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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