Flutter

问题 I am Trying to develop a chat app and I am trying to display the text messages inside a container and set the width according to the length of the message. How can I set the width according to the length of a String? P.S messages are displayed using listview.builder and each container has a background color. ListView.builder( padding: EdgeInsets.only(top: 8.0, left: 15.0, right: 15.0), itemCount: messages.length, itemBuilder: (context, index) { return Container( padding: EdgeInsets.all(20.0),

问题 I am trying to use PlatformViews in Flutter to show Swift code natively in my Flutter app, however my app is crashing with my current code. This is my AppDelegate currently where I am invoking my method channel: import Foundation @UIApplicationMain @objc class AppDelegate: FlutterAppDelegate, TJPlacementDelegate { var p = TJPlacement() override func application( _ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? ) -> Bool { let

问题 I am trying to use PlatformViews in Flutter to show Swift code natively in my Flutter app, however my app is crashing with my current code. This is my AppDelegate currently where I am invoking my method channel: import Foundation @UIApplicationMain @objc class AppDelegate: FlutterAppDelegate, TJPlacementDelegate { var p = TJPlacement() override func application( _ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? ) -> Bool { let

问题 I've recently upgraded to Flutter the latest version. As a result, my app won't load and fails instantly. The error seems to be due to the Flutter version. I've tried to downgrade but this wasn't successful. Here's the output of the console. Running "flutter pub get" in source... Because every version of flutter_test from sdk depends on vector_math 2.1.0-nullsafety.3 and fstore depends on vector_math 2.0.8, flutter_test from sdk is forbidden. So, because fstore depends on flutter_test any

问题 I am writing this flutter code where I have Image in an Image widget and I want to convert it into File so that I can upload it to Firebase Storage. Image _image = Image.asset('assets\images\profile.png'); File _fileImage = convertToFile(_image); //upload _fileImage to Firebase Storage code I need the File convertToFile(Image img) function. 回答1: Special thanks to sami kanafani. This is my solution (works perfectly for me): import 'dart:async'; import 'dart:io'; import 'package:flutter

问题 I am writing this flutter code where I have Image in an Image widget and I want to convert it into File so that I can upload it to Firebase Storage. Image _image = Image.asset('assets\images\profile.png'); File _fileImage = convertToFile(_image); //upload _fileImage to Firebase Storage code I need the File convertToFile(Image img) function. 回答1: Special thanks to sami kanafani. This is my solution (works perfectly for me): import 'dart:async'; import 'dart:io'; import 'package:flutter

问题 I've recently upgraded to Flutter the latest version. As a result, my app won't load and fails instantly. The error seems to be due to the Flutter version. I've tried to downgrade but this wasn't successful. Here's the output of the console. Running "flutter pub get" in source... Because every version of flutter_test from sdk depends on vector_math 2.1.0-nullsafety.3 and fstore depends on vector_math 2.0.8, flutter_test from sdk is forbidden. So, because fstore depends on flutter_test any

问题 I am using Redux with Flutter for state management. Whenever I dispatch an action, I want to know which widgets were re-rendered. Is there any way of doing it? 回答1: In flutter, whenever one widget update ; the whole widget tree repaint. So... no. But you can also introduce "repaint boundaries" manually by inserting in your tree a RepaintBoundary widget. This explicitly tells flutter to create a new painting layer for it's child (which implies memory cache). So that whenever that child updates

问题 I have an app with the usual Google ad and in-app-payment stuff. It's accepted into the Play Store all right. Now I'd like to make it support both GMS and HMS at the same time (based on the availability of the appropriate services, the app can decide which platform to use). The app, with the Huawei functionality built in, works just fine while testing on my own devices. However, as soon as Huawei's libraries are bundled with the app, the Play Store Console simply refuses it. No error message,

问题 I am using Redux with Flutter for state management. Whenever I dispatch an action, I want to know which widgets were re-rendered. Is there any way of doing it? 回答1: In flutter, whenever one widget update ; the whole widget tree repaint. So... no. But you can also introduce "repaint boundaries" manually by inserting in your tree a RepaintBoundary widget. This explicitly tells flutter to create a new painting layer for it's child (which implies memory cache). So that whenever that child updates