Flutter

How do I create a time-based Flutter App?

由 我与影子孤独终老i 提交于 2021-02-19 02:54:33
问题 I need to create a login form. After user successfully login than I need to start some kind of timer (ex: 3 min), so if user has no reaction to app or other word if flutter app state is paused, suspended or inactive more than 3 min. the app will goto main login page. As long as user has interaction with app I need to cancel the timer and only I need to star timer app state is paused, suspended or inactive. How do I do that? I try to implement the "WidgetsBindingObserver" but its look like is

How do I create a time-based Flutter App?

由 你离开我真会死。 提交于 2021-02-19 02:54:13
问题 I need to create a login form. After user successfully login than I need to start some kind of timer (ex: 3 min), so if user has no reaction to app or other word if flutter app state is paused, suspended or inactive more than 3 min. the app will goto main login page. As long as user has interaction with app I need to cancel the timer and only I need to star timer app state is paused, suspended or inactive. How do I do that? I try to implement the "WidgetsBindingObserver" but its look like is

Converting a byte array to image in Flutter?

由 五迷三道 提交于 2021-02-19 02:53:29
问题 I want to get a image from my REST API service however haven't found any documentation on how to decode the response body that would be a byte array to an image in Flutter? Anyone with some useful resources, please help... 回答1: Use this for your image widget: Image.memory(bytes) . You can find more documentation here: https://docs.flutter.io/flutter/widgets/Image/Image.memory.html 回答2: Since top rated answer use flutter/widget.dart, this use dart:ui only Future<Image> tinypng() async { final

Stop saving in cache memory Flutter web Firebase hosting

由 江枫思渺然 提交于 2021-02-19 02:47:13
问题 I designed a web app using the Flutter web. I hosted it with Firebase host. But It's not showing changes of my code after deploying to firebase. It's still showing my older version of web app. But I can overcome this problem by clearing cache memory of browser or ctrl+refresh . But I don't want to do this every time I deploy to firebase. How to stop saving my web app in cache memory? hosted link: https://frcovid19dashboard.web.app 回答1: Append a version number to your main.dart file. Every

Only static members can be accessed in initializer. Dart2.0

由 爷，独闯天下 提交于 2021-02-19 02:19:14
问题 I am using banklist in stateful widget. passing list to pageState using List<Bank> bankLists = this.widget.bankLists; Que 1. Why I am getting error at gradientcolor: gradientBankCard("FFB74093","FFB74093")) that only static members can be accessed in initializer? Que 2. How to pass const Data to gradientBankCard method . for Example I want to pass Color.fromRGBO(220, 132, 58, 1.0) to Arguments that gives error to. I List<Bank> bankLists = [ Bank( id: "1", name: "B1", loanAmount: "₹ 250000",

Execution failed for task ':app:validateSigningRelease'. Flutter error

由 半城伤御伤魂 提交于 2021-02-19 02:00:06
问题 I want to release my app but stack with this issue FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':app:validateSigningRelease'. > Keystore file 'D:\FlutterProjects\Panaszok\02012020 - Copy (2) - Copy\Multi Restaurants Flutter App\android\app\key\panaszok.jks' not found for signing config 'release'. * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights. *

how to make dynamic chart in flutter?

由 ⅰ亾dé卋堺 提交于 2021-02-19 01:37:11
问题 Hello I tried to make a simple chart in flutter with date in x axis and data in Y axis. When I push a button data is increase for the current date. first goal is completed with the code bellow. But now I don't know how to make chart more dynamic, I want statistic of my pressed button for each new day. I don't know how to add dynamicaly a new column of data for each new days. import 'package:flutter/material.dart'; import 'package:charts_flutter/flutter.dart' as charts; import 'package:intl

Type mismatch: inferred type is PluginRegistry? but FlutterEngine was expected

由 心已入冬 提交于 2021-02-19 00:38:28
问题 I want to work with Flutter Workmanager, I did the cited configuration in my .kt like this: package com.example.mybackprocess import be.tramckrijte.workmanager.WorkmanagerPlugin import io.flutter.app.FlutterApplication import io.flutter.plugin.common.PluginRegistry import io.flutter.plugins.GeneratedPluginRegistrant class App : FlutterApplication(), PluginRegistry.PluginRegistrantCallback { override fun onCreate() { super.onCreate() WorkmanagerPlugin.setPluginRegistrantCallback(this) }

Android面试题集：以前烂大街的四大组件-Activity，面试重提这些知识点你还记得吗?

由 风流意气都作罢 提交于 2021-02-18 23:15:16
前言 虽然有很多面试的文章里都有这些题目，但是我每次在看的时候，总是会觉得有些分散，复习的时候还要重新去找到对应的文章，所以我就想着自己来整理一下，并且把题目给分一下类型；自己整理可以帮助我复习的同时还可以巩固一遍；这次主要是4大组件相关，后续我会继续整理，觉得有帮助的可以点个赞。 接下来是关于Activity的面试题了： 描述一下Activity 生命周期？ onCreate() Activity第-次被创建的时候调用，一些初始化操作可以在这里完成。 onStart() 这个方法在Activity 由不可见变为可见的时候调用。 onResume() 这个方法在Activity 准备好和用户进行交互的时候调用。此时的Acivity一定位于返回栈的栈顶，并且处于运行状态。 onPause() 这个方法在系统准备去启动或者恢复另-个Activity的时候调用。 onStop() 这个方法在Activity 完全不可见的时候调用。它和onPause()方法的主要区别在于，如果启动的新Activity 是一个对话框式的Activity,那么onPause()方法会得到执行，而onStop()方法并不会执行。 onDestroy() 这个方法在Activity被销毁之前调用，之后Activity的状态将变为销毁状态。 onRestart

How to configure go back button in Browser for Flutter Web App

由 跟風遠走 提交于 2021-02-18 22:55:27
问题 I'm not asking about webview. This is about Flutter web app. I need to go back to a specific page when user press back button which is inbuilt in browser. Any guessing ? I'm getting this error when I press back button Error: Assertion failed: org-dartlang- sdk:///flutter_web_sdk/lib/_engine/engine/history.dart:110:14 _userProvidedRouteName != null is not true at Object.throw_ [as throw] (http://localhost:8300/dart_sdk.js:4770:11) at Object.assertFailed (http://localhost:8300/dart_sdk.js:4721
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