Recent questions tagged Dart

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dart - How do I auto scale down a font in a Text widget to fit the max number of lines?

I'm trying to use BoxFit.scaleDown in a FittedBox's fit property to scale the font down in a Text widget to accommodate ... , ), ), ); } } 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 sound push notification does not work (Flutter)

{ "to": "XXXX", "notification": { "title": "ASAP Alert", "body": "Please open your app" }, "data": { ... it because of the code on my dart file? 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 select BottomNavigationBar Tab in Flutter instead of built in onTap callback?

I have been working with BottomNavigationBar in the flutter, but I am not able to select a Tab programmatically ... available to change Tabs? 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 textfield that auto expands when text is entered and then starts scrolling the text when a certain height is reached

I've tried many configurations of the Flutter TextField but can't figure out how to build this one. I'm ... apps like WhatsApp and telegram. 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 change Status Bar and App Bar color in Flutter?

I'm trying to change the color of the system status bar to black. The configuration seems to be overridden by the AppBar ... Text('100'), ])); 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 bold (or format) a piece of text within a paragraph?

How can I have a line of text with different formatting? e.g.: Hello World 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 - Scroll Function In Flutter Web

I'm still new to Flutter Web. I have 3 lines in my flutter web, the first line is the welcome message, the ... it on flutter web? Thank you. 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 - Taking total control of PaperInput validation

I'm using PaperInput and like the feel. But, is there a way to do the validation using my own logic? For ... is there a way 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 - How To Create Folder in Local Storage/External Flutter?

import 'package:path_provider/path_provider.dart'; import 'dart:io'; void createAppFolder() async { final directory = await ... to do thats ?? 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 - Extending a class with only one factory constructor

I was wondering which is the best way to extend the CustomEvent class, a class which has only one factory ... any class of this form? 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 implement push notification in flutter

Hi I am trying to implement push notification in flutter how to display as notification can any one help,I am able to listen ... ], ), )); } } 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

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dart - How to check the device OS version from Flutter?

Platform.operatingSystem will tell you whether you're running on Android or iOS. How can I check which version of the device OS am I running on? 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 - Combine/merge multiple maps into 1 map

How can I combine/merge 2 or more maps in dart into 1 map? for example I have something like: var firstMap = {"1":"2"}; ... "1":"2", "1":"2"}; 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 the width of an AlertDialog

I wonder how to change the default width of an AlertDialog, I only succeeded to change the border radius : Here ... Result expected : Any idea? See Question&Answers more detail:os...

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

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2.1k views

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dart - How to send image through post using JSON in flutter?

I am building a flutter app, which utilizes image picker to capture or select an image from the gallery, but I ... BASE64? Thank you in advance. 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 directed graph. Can I use CustomPainter Class with custom widgets?

I want to build a directed graph like in the picture below with flutter. I dont know where to start. ... graph should be customizable dynamicly. 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 - Get Download URL from Firebase Storage in Flutter

I'm currently exploring Flutter, I found there is an official Firebase Storage plugin in Flutter ... from that StorageReference. See Question&Answers more detail:os...

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

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1.3k views

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dart - Flutter - FloatingActionButton in the center

Is it possible to make the FloatingActionButton in the centre instead of the right side? import 'package:flutter/material.dart'; ... (){} ) ); } 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

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dart - Show a snackbar after navigate in Flutter

After an action (for example, "save"), user is returned to another page in the app. I want to show a snackbar ... is the best way to do 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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1.6k views

1 answer

dart - Flutter position fixed equivalent

Is it possible to fix an object in the screen that stays fixed regardless of scrolling? Something similar to CSS position fixed. See Question&Answers more detail:os...

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

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1.1k views

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dart - What are the semantics of _internal?

I keep seeing references to _internal in examples like the following: class Symbol { final String name; static ... Are my assumptions correct? See Question&Answers more detail:os...

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

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1.3k views

1 answer

dart - flutter - correct way to create a box that starts at minHeight, grows to maxHeight

I have a container that I want to start off at a minimum size and grow (if its contents grow while user ... get the box working as described? See Question&Answers more detail:os...

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

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1.3k views

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dart - Enum from String

I have an Enum and a function to create it from a String because i couldn't find a built in way to ... (Type enumType,String value){ } 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 - Update UI after removing items from List

I want to update my ListView if i remove or add items. Right now i just want to delete items and see ... there a problem with my architecture? 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

1 answer

dart - Flutter listview with Map instead of List

I'm trying to display the contents of my HashMap values in a ListView.builder widget. Is there a way to do ... maps with the data to display. See Question&Answers more detail:os...

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

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1.0k views

1 answer

dart - No Directionality widget found

I am trying to create a simple layout in flutter but keep getting this error: The following assertion was thrown ... 'hasSize': is not true. See Question&Answers more detail:os...

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

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2.1k views

1 answer

dart - AlertDialog without context in Flutter

I want to show an AlertDialog when a http get fails. The function showDialog (https://api.flutter.dev/flutter/material/ ... titolo), ... ); } 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 - Date Time format in Flutter dd/MM/YYYY hh:mm

By using this : Text(new DateTime.fromMillisecondsSinceEpoch(values[index]["start_time"]*1000).toString(), I am getting the ... /MM/YYYY hh:mm?? See Question&Answers more detail:os...

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

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