Flutter

问题 Note: I used this answer How to add label to pieChart flutter as a reference to implement labelAccessorFn. I am using charts_flutter package to display charts in my flutter app, as far as I know, we use labelAccessorFn to show labels in Pie Chart but it's not working in my case. App Overview: It's a mood checker app where user chose its mood every day using one of 5 emojis and in charts, we display data of emoji vs num of days it's been chosen. chart file (labelAccessorFn is defined in

问题 Note: I used this answer How to add label to pieChart flutter as a reference to implement labelAccessorFn. I am using charts_flutter package to display charts in my flutter app, as far as I know, we use labelAccessorFn to show labels in Pie Chart but it's not working in my case. App Overview: It's a mood checker app where user chose its mood every day using one of 5 emojis and in charts, we display data of emoji vs num of days it's been chosen. chart file (labelAccessorFn is defined in

问题 In my application, I am using a stack and a container . Within the container i have a form and its fields. Below is my code import 'package:flutter/cupertino.dart'; import 'package:flutter/material.dart'; import 'package:flutter/widgets.dart'; class Login extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( backgroundColor: Colors.white, body: LoginUI(), ); } } class LoginUI extends StatefulWidget { @override State<StatefulWidget> createState() { // TODO:

问题 I am trying to utilize the Location package in Flutter, but when I try to display the Latitude and Longitude in my app I am getting an error stating "The getter 'latitude' was called on null." Is it possible that there's something wrong with the location services on my device? I am also prompted with a popup when I click on the screen stating "For a better experience, turn on device location, which uses Google's location service" but I already enabled permissions for location services in the

问题 I am having a stuck on transferring the value from the second page to the third page using the value pass from the first page. when I am trying to use the usual way that I am used to calling the data in the stateful widget, it returns an error on undefined. class restaurantLISTVIEW extends StatefulWidget { restaurantLISTVIEW({this.category}); final String category; @override _restaurantLISTVIEWState createState() => _restaurantLISTVIEWState(); } within extends state:(working)

问题 I'm new to flutter and I don't have proper idea about the states of a widget. I'm creating an application where I'm adding some items to the cart from home screen and by clicking on Cartbutton I'm opening ModalBottomSheet where user can also modify their cart items, and what I want when user close the ModalBottomSheet without proceeding for checkout. it refreshes the selected items at home screen as well. I'm calculating addition and subtraction of each item into a list. Everything is working

问题 i want to open contact details page or information that we can open it from contact book but i need it to open programatically, i am new to IOS. I am developing an app in flutter environment, i didn't found anything in flutter for this so i have done this in android via platform specific code, now i need this working for IOS too. Did anyone know how can i achieve it in Flutter or IOS via platform specific method, Or suggest specific IOS code for this? Thanks in advance!! 来源： https:/

问题 With the new ListView add two or more children. Scroll down the list to the point where the first child is entirely off the screen. Scroll all the way back up to the initial position. The ListView shows nothing on screen (just white empty space). Currently I'm facing this problem after upgrading the flutter to the latest version. Please help me fixing this issue. https://github.com/flutter/flutter/issues/8155 My error and issue is exactly same as provided in this case. 来源： https:/

问题 With the new ListView add two or more children. Scroll down the list to the point where the first child is entirely off the screen. Scroll all the way back up to the initial position. The ListView shows nothing on screen (just white empty space). Currently I'm facing this problem after upgrading the flutter to the latest version. Please help me fixing this issue. https://github.com/flutter/flutter/issues/8155 My error and issue is exactly same as provided in this case. 来源： https:/

问题 With the new ListView add two or more children. Scroll down the list to the point where the first child is entirely off the screen. Scroll all the way back up to the initial position. The ListView shows nothing on screen (just white empty space). Currently I'm facing this problem after upgrading the flutter to the latest version. Please help me fixing this issue. https://github.com/flutter/flutter/issues/8155 My error and issue is exactly same as provided in this case. 来源： https:/