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 ... ' 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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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 ... . 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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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 ... } 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(" ... .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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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 ... 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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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 ... 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 ... 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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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/ ... : 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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dart - Flutter populate dropdown button from json array

How do I populate this JSON list into dropdown button? { "status": true, "message": "success", "data": { "list": ... ": "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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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 ... 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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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. ... (), ), ), 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 - 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< ... 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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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 ... (), 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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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 ... (), }, ); } } 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 - Dartium displays blank page

my Dartium web browser suddenly stopped displaying the content of Polymer application. Even the basic dart-polymer ... 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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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 ... (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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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 ... } } 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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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 ... '] 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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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 ... 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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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 ... 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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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 ... 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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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 ... 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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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. ... 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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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, ... 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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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 ... 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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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 ... 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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3.1k views

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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 ... ('/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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2.2k views

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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 ... 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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