Flutter Animated Listview

The stream that we are inserting into it is the Firestore. flutter Creating responsive Flutter application using Material Design using a navigation drawer. The Basics of Animation with Dart's Flutter Framework;. In this tutorial, we will see How To Display Image in Flutter. In this Google flutter code example we are going to learn how to create an Infinite Scroll with ListView in Flutter. Flutter is still in alpha, so some things might change on upgrading the package. The languages like flutter, android, java,kotlin etc. Flutter UI Component – Build App Using Material Design. What is also the fact is that we as developers are scared to push our apps to the next level by adding those minor animations that make the app beautiful instead of just pretty. I have created listview elements with multiple clickable buttons in this tutorial example. Easily add staggered animations to your ListView, GridView, Column and Row children as shown in. Compared with Xamarin, different experts having contrasting opinions on the two frameworks. We have rectangular area which response to our touch on the UI element. The code is based on flutter version 1. with the help of this languages any user can develop the beautiful application For more information about Flutter. With the release of Flutter 1. The index property is the index of the selected tab and the animation represents the current scroll positions of the tab bar and the tar bar view. As this is the first package* that I have published on Dart Pub I’ll also talk about publishing a package for Flutter in a following blog post. The Flutter framework makes it easy for you to build user interfaces that react smoothly in your app, while reducing the amount of code required to synchronize and update your app's view. This video is unavailable. // Remove item from data and subtitle list but keep copy to give to the animation. The tween is something in which you specify the input output range. Flutter에서 ListView 대신 사용할 수 있는 것은? Flutter에서 ListView와 동일한 것은… ListView입니다! 안드로이드 ListView에서는 어댑터를 작성하여 ListView로 전달하면, 어댑터가 반환하는 대로 각 행을 렌더링합니다. The SliverAppBar will only scroll down or up when the ListView. Splash screen in Flutter. fastOutSlowIn. Shows how to use text callbacks in list controls. A while ago, I wrote an article on the basics of using a ListView and GridView in Flutter. dart, country_item. The code is based on flutter version 1. yaml is pretty typical of a Flutter project, with a few additions for building web applications, along with dependency overrides with git repo url and path, since the flutter_web package is not yet published to the pub. In the image URLs, I've told Unsplash to return images with a width of 400px. The “swipe to dismiss” pattern is common in many mobile apps. Taken inspiration from the Animated List Sample and Java-diff-utils. Flutter - Firebase Realtime Database Persistence. And, in case you need to add an Android platform-specific implementation. fluttertutorial. This widget is similar in structure to ListView. Material is an adaptable system of guidelines, components, and tools that support the best practices of user interface design. The Floating Action Button calls a method to add a new item to the list. The ListView widget supports horizontal lists. … It's the animation controller class, … which is going to tell the animation to start, to stop, … to go forwards, to loop back, how long to animate for. Documentation and code for building banners on Flutter. app state − Last for entire application like logged in user details, cart information, etc. I mean, even if you compile the release version of your app, if you try to slowly scroll a ListView you can definitely tell that there is a delay from when you start to scroll to when the List starts to move (it's so evident in each flutter app you can find on play store, and it simply doesn't happen in a native app with some scrollable lists. I would like to have my list items perform this animation when tapped. It is particularly useful if you're using a Crash Reporting library or if you implemented a way to retrieve crashes. It only takes a minute to sign up. This example shows how to use SharpCompress library with TreeView & ListView. Flutter Arsenal provide the working plugins and package of Mobile application components like Mobile different screen design in Flutter, IOS, and Native Android. 18 templates, Redux, CRUD Sqlite and Firebase, http request, webview, google and firebase auth, global notification strategy, create and preview PDF, create and load csv, pagination, infinite scroll, touch id, map, change theme, custom fonts, download & share files and more. The list items are automatically inserted to the list using an Adapter that pulls content from a source such as an array or database. We have often seen this type of things in websites where you scroll towards the button and suddenly a button pop up to take you at the top of the page. Flutter Installation and Setup - Link. September 18, 2019 Toggle button. Official Flutter docs; Flutter for Android developers introductory. You can place a StickyHeader or StickyHeaderBuilder inside any scrollable content, such as: ListView, GridView, CustomScrollView, SingleChildScrollView or similar. Installation #. In Flutter Screens are Just Widget. Generally, you'll want to use either FlatList or SectionList. In this article, the same visual effect of Layout Animation will be applied on ListView and ListActivity. Flutter 动画详解(二) 本文通过代码层面去分析Flutter动画的实现过程,介绍了Flutter中的Animation库以及Physics库。 Flutter 动画详解(一) 本文主要介绍了动画的原理相关概念,对其他平台的动画做了一个简要的梳理,并简要的介绍了Flutter动画的一些知识。. Also, know more about ListView Widget in Flutter to better understand how the different dynamics of the PageView Widget is created. In our previous tutorial, I showed how to Create a ListView Header Parallax. From the subscription side of the Stream, there will be a single event with data that is a List of 10 items. Java Project Tutorial - Make Login and Register Form Step by Step Using NetBeans And MySQL Database - Duration: 3:43:32. , How to listview in Flutter, Create Alert Dialog with Flutter, How to http get JSON with Flutter, Simple Material App with Flutter, Android Layout with Video in background, How to create simple About Pages in Android, Create Progres Layout with Kotlin, Create Seting Level Progress Bar Slider, Create ProgressView with Animations in Android, How to create contact picker with Kotlin ?, How to. Poznan Flutter Developer Group Agenda - Animation types - Tween animations, physics-based animation - Animated Container widget - Animated CrossFade widget - Hero animation - Flare overview - FlareActor, NimaActor - Expressive animations 2 For animated version of this presentation. These concepts include, Physics Simulations, Constraints, Layout Builder Widgets, The Flutter Render Life Cycle, and Custom Scroll Physics Objects. A quick Android example with code snippet to demonstrate creating a ListView parallax effect with a sticky header. Easily add staggered animations to your ListView, GridView, Column and Row children as shown in Material Design guidelines. This is first part of tutorial series in which I’ll show you guys how to build Android application using Flutter and WordPress API. Clean Login UI with Hero Animation in Flutter. 1 Children1. In this Google flutter code example we are going to learn how to scroll ListView to top or bottom in Flutter. It displays its children one after another in the scroll direction. the detail view cross-fades with the ListView not the tapped item. AnimationConfiguration. This tutorial contains all the attributes and methods with example. 12 Flutter: Animations /*to start the animation we use this but it shows. Flutter - Accessing REST API - Flutter provides http package to consume HTTP resources. Stack Overflow em Português is a question and answer site for programadores profissionais e entusiastas. ListView myList = new ListView( children: myWidgets ); At this point, if you run the app, you should be able to scroll through the list and press any button to launch the associated website. In this blog, we'll look at how we can build a dismissable list view in Flutter. Normally I the reordable list is displayed. Flutter Arsenal provide the working plugins and package of Mobile application components like Mobile different screen design in Flutter, IOS, and Native Android. Every time a piece of data is sent into our stream builder the widget tree below it is rebuilt. ListTile in Flutter with Example in Android Studio. I definitively think the UI looks better with Flutter than XF for the same amount of time spent on the UI even if you have a huge background with Xaml. Flutter ListView Click Option Animation:This Flutter Tutorial post is you can implement your application, ListView Click open the animation options edit, update, delete. Flutter supports its through StatefulWidget. Easily add staggered animations to your ListView, GridView, Column and Row children as shown in Material Design guidelines. Alert Dialog in Flutter with Example in Android Studio. ListView myList = new ListView( children: myWidgets ); At this point, if you run the app, you should be able to scroll through the list and press any button to launch the associated website. Custom animation can really make your app stand out. A Flutter library to easily display a list with animated changes from a Stream>. I also would like to have animated padding or "delayed" animation in my list. , How to listview in Flutter, Create Alert Dialog with Flutter, How to http get JSON with Flutter, Simple Material App with Flutter, Android Layout with Video in background, How to create simple About Pages in Android, Create Progres Layout with Kotlin, Create Seting Level Progress Bar Slider, Create ProgressView with Animations in Android, How to create contact picker with Kotlin ?, How to. Almost every app uses dynamic ListView. AnimationConfiguration. Conclusion. You can read more about it in this article by David Anaya: Custom scroll physics in Flutter – Flutter Community – Medium. In this example, we will create a List of Todos. Flutter offers a lot of options to make them more beautiful. Now, we will add our two views: ProfileView and NotificationView. in is the website that bring you the latest and amazing resources of code. An awesome list that curates the best Flutter libraries and tools. Tap an item to select it, tap it again to unselect. Flutter Installation and Setup - Link. In this Google flutter code example we are going to learn how to populate ListView with Json API Data. The stream that we are inserting into it is the Firestore. to create rotate animation in Flutter. With the introduction of flutter, mobile application development has had a major change. The languages like flutter, android, java,kotlin etc. Flutter Staggered Animations. Animated version of Opacity which automatically transitions the child's opacity over a given duration whenever the given opacity changes. The drawer is composed of 2 things: a hamburger menu button and a drawer with the list of options for the app. React Native vs Flutter with tutorial, introduction, environment setup, first app hello world, state, props, flexbox, height and width, listview, scrollview, images. Layout of the flutter example. Some of the Xamarin Experts advise that you shouldn't put a ListView inside a ScrollView because the ListView class implements its own scrolling and it just doesn't receive gestures because they all are handled by the parent ScrollView. ListView is the most commonly used scrolling widget. The code is based on flutter version 1. Widgets in Flutter can be Stateful or Stateless, depending on whether they depend on some state. Flutter's default control's animation are awesome and run like a charm on the demo app. We can implement this fumctionality help of ValueAnimator. You need to be cautious before upgrading. The Flutter's Project Structure. The Basics of Animation with Dart's Flutter Framework;. The ListView widget supports horizontal lists. Let's create splash screen in Flutter. Stack Overflow em Português is a question and answer site for programadores profissionais e entusiastas. 3 ListView Properties1. 119播放 · 0弹幕 02:59. You Will Build Real World Flutter Application. Right now you just have a card for your dog. Flutter Infinite List view: flutter infinite list view which fetches data over the network and loads it as a user scrolls down means infinite scrolling for example for e-commerce products flutter infinite list view fetches the products from the remote network and load on the user app and when the user of the app scrolls down it loads the products;. It provides many high level methods a. That's the fact. Shows how to use text callbacks in list controls. Flutter By Example is a collection of example tutorials that will help you master Flutter by coding real apps. Clean Login UI with Hero Animation in Flutter. in Android Studio. The widget will use a ListView, in part because I plan to use Firebase Cloud Firestore as a datastore and that's the pattern cloud_firestore uses. While you haven't built any apps using Flutter, let me give you a quick overview of its project structure. Flutter’s animation library is really Awesome for creating really complex animations however there are times where you would want to use more subtle animation such as those which occur whenever. Almost every single mobile app will have a splash screen when start. Listview & Adapter ListView在Flutter中相当于什么. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. Structure of the Xaml UI We will take the button on the center of the screen, so regardless on the screen size it will always be on the center. org repository and pub will fail without these overrides. Flutter is still in alpha, so some things might change on upgrading the package. Flutter Infinite List view: flutter infinite list view which fetches data over the network and loads it as a user scrolls down means infinite scrolling for example for e-commerce products flutter infinite list view fetches the products from the remote network and load on the user app and when the user of the app scrolls down it loads the products;. A bit of background It all began in 2011: Xamarin, now a Microsoft-owned company, came up with a solution for hybrid mobile apps through its signature product, Xamarin SDK with C#. Widgets are UI elements, you put together, like building blocks, to build your UI. In one my specific use-cases the only variable part of the equation was to figure out how many rows a text label would have occupied when being rendered on the specific container. I need to animate deletions and insertions to that list, but have no idea how. Flutter vs Xamarin Comparison. Subclass StatefulWidget and State. Your Firebase-Flutter setup is finished, and you're ready to start building your app!. ListView is one of the most commonly-used in mobile apps development. ★★ How Long Does She Want You to Last? ★★ A recent study proved that the average man lasts just 2-5 minutes in bed (during intercourse). 1BestCsharp blog 5,032,628 views. Flutter Arsenal provide the working plugins and package of Mobile application components like Mobile different screen design in Flutter, IOS, and Native Android. We’ve already had a Tutorial, please visit: How to integrate Firebase into Flutter App – Android Studio. In this tutorial, we are going to show you how to create scale transition in Flutter by giving an example. Card behavior updated to align with guidance across all platforms. Awesome Flutter Snippets. Allows you to retrieve exceptions of an Android Wear app in your handheld's one. This looks a little weird but it is basically generating a list of 10 items. In fact it seems a Hero animation is the only one that can animate across widgets. ListView is the most commonly used scrolling widget. It increases your speed of development by eliminating most of the boilerplate code associated with creating a widget. in is the website that bring you the latest and amazing resources of code. Today I'm going to create the PostsList widget that will be displayed when there are images. With the introduction of flutter, mobile application development has had a major change. fastOutSlowIn. You Will Learn Flutter Horizontal Listview. 11 Flutter: Sliding menu using a Drawer. When in doubt, let the parent widget manage the child widget’s state. The code is based on flutter version 1. We can implement this fumctionality help of ValueAnimator. Add these views in our main. Awesome Flutter Snippets. Flutter UI Component – Build App Using Material Design. Watch Queue. Flutter Infinite List view: flutter infinite list view which fetches data over the network and loads it as a user scrolls down means infinite scrolling for example for e-commerce products flutter infinite list view fetches the products from the remote network and load on the user app and when the user of the app scrolls down it loads the products;. Material Components (MDC) help developers implement Material Design. I'm having trouble using Hero. I would like to have my list items perform this animation when tapped. Right now you just have a card for your dog. However, I tried to build a workaround that has the list both on a reorderable and an animated list. Documentation and code for building banners on Flutter. The architectural model of Flutter has always prioritized a small core framework, supplemented by a rich package community. I mean, even if you compile the release version of your app, if you try to slowly scroll a ListView you can definitely tell that there is a delay from when you start to scroll to when the List starts to move (it's so evident in each flutter app you can find on play store, and it simply doesn't happen in a native app with some scrollable lists. Flutter - Firebase Realtime Database Persistence. This is the second article of a multi-part series where we will focus on how to navigate within a Flutter app. You Will Build Real World Flutter Web Application. Flutter Development (Day-13): In this post we are going to talk about basic animations in FlutterFirst we start the animation by creating two objects Animation animation, AnimationController animationController. If you encounter any problems feel free to. , How to listview in Flutter, Create Alert Dialog with Flutter, How to http get JSON with Flutter, Simple Material App with Flutter, Android Layout with Video in background, How to create simple About Pages in Android, Create Progres Layout with Kotlin, Create Seting Level Progress Bar Slider, Create ProgressView with Animations in Android, How to create contact picker with Kotlin ?, How to. Discover how to use Flutter, the popular open-source framework created by Google for developing Android and iOS apps. with the help of this languages any user can develop the beautiful application For more information about Flutter. Lets you place headers on scrollable content that will stick to the top of the container whilst the content is scrolled. We are going to start by creating a ListView to display GitHub Repositories. This example shows how to use SharpCompress library with TreeView & ListView. Maintainer: @slightfoot. Documentation and code for building banners on Flutter. In this tutorial, we will see How To Display Image in Flutter. Creating a ListView We are going to start by creating a ListView to display GitHub Repositories. The Flutter’s Project Structure. *Excluding our work with the Flutter team on the camera plugin. Flutter UI Component – Build App Using Material Design. 1 Children1. This pubspec. Widgets are the building blocks of the Flutter UI, everything is a widget. With its cross-platform code base, crisp animation, and because it is easy to learn and use, it is one of the growing platforms. Shows how to use text callbacks in list controls. In fact it seems a Hero animation is the only one that can animate across widgets. Custom animation can really make your app stand out. About the book Flutter in Action teaches you to build awesome, full-featured mobile applications with Flutter. AndroidListActivity have a ListView only, the selected item will be passed back to AndroidListView by means of Bundle. Conclusion. If you continue to use this site we will assume that you are happy with it. Flutter, developed by Google, is an open-source development framework for making multi-platform apps. 4 ShrinkWrap1. Stateful widgets are useful when the part of the user interface you are describing can change dynamically. particles_flutter : Package to add particles animation in Flutter project. Flutter Infinite ListView. To demonstrate how ListView works, we will try to create a simple ListView in Flutter that displays a list of text. In a regular Xamarin. You Will Learn Flutter Horizontal Listview. In Flutter, we can achieve this with Drawer Widget in combination with a Scaffold to create a layout with a Material Design Drawer. I know that you're here because you value your time. As you know in flutter everything is a widget. Compared with Xamarin, different experts having contrasting opinions on the two frameworks. Flutter ListView Tutorial - WeightTracker 1 by Marcin Szałek Jul 22, 2017 Flutter , Weight Tracker 19 comments In this post, we are going to create a basic ListView in Flutter with dynamically added values. ListView is one of the most commonly-used in mobile apps development. I would like to have my list items perform this animation when tapped. Looking for a maintainer, my fling with Flutter has sadly come to an end. Creating a Grid. This is the second article of a multi-part series where we will focus on how to navigate within a Flutter app. Android includes different animation APIs depending on what type of animation you want, so this page provides an overview of the different ways you can add motion to your UI. Awesome Flutter Snippets. Reply Delete. That's the fact. The Flutter team designed the ListTile widget to handle the normal content that you would want in a list. Flutter ListView Click Option Animation:This Flutter Tutorial post is you can implement your application, ListView Click open the animation options edit, update, delete. Android Splash Screen Animation example tutorial is developed here. ListView myList = new ListView( children: myWidgets ); At this point, if you run the app, you should be able to scroll through the list and press any button to launch the associated website. The ebook is a book that contains articles and code about flutter widgets. ListTile in Flutter is similar to the concept of Cards in Android. In the cross axis, the children are required to fill the ListView. Android Splash Screen Animation example tutorial is developed here. Flutter ListView Click Option Animation:This Flutter Tutorial post is you can implement your application, ListView Click open the animation options edit, update, delete. From the subscription side of the Stream, there will be a single event with data that is a List of 10 items. ios and Android App Development Using Flutter. Delayed Animations - Click here. When in doubt, let the parent widget manage the child widget’s state. Generally, Flutter applications are performant by default, so you only need to avoid common pitfalls to get excellent performance instead of needing to micro-optimize with complicated profiling tools. Every time a piece of data is sent into our stream builder the widget tree below it is rebuilt. Flutter includes the ListView widget to make working with lists a breeze. Due to its richness, animation becomes an integral part of modern mobile application. Widgets in Flutter can be Stateful or Stateless, depending on whether they depend on some state. That List of 10 items is used as the first value in a new Stream. If a widget changes—the user interacts with it, it’s Stateful; otherwise it can be Stateless. You can think of dismissible widget as a draggable piece UI of that can be dragged in any direction and the action causes the UI to slide out from the view. A while ago, I wrote an article on the basics of using a ListView and GridView in Flutter. Awesome Flutter Snippets. Every time a piece of data is sent into our stream builder the widget tree below it is rebuilt. Some of the Xamarin Experts advise that you shouldn't put a ListView inside a ScrollView because the ListView class implements its own scrolling and it just doesn't receive gestures because they all are handled by the parent ScrollView. Thought I'd necro this thread with my experience: I found this technique to be a bit lacking. Items are added, removed and changed all the time. This tutorial contains all the attributes and methods with example. Flutter makes beautiful animations easy. In the cross axis, the children are required to fill the ListView. This widget's AnimatedListState can be used to dynamically insert or remove items. Material Components (MDC) help developers implement Material Design. Today I'm going to create the PostsList widget that will be displayed when there are images. Then, your project will be created in a few moments. Tap ‘+’ to insert at the selected item, ‘-‘ to remove the selected item. Default FAB animation in page transitions. To refer to the AnimatedListState either provide a GlobalKey or use the static of method from an item's input callback. Animation 01 | Base Animation. The Flutter team designed the ListTile widget to handle the normal content that you would want in a list. Normally I the reordable list is displayed. The languages like flutter, android, java,kotlin etc. Flutter is an open source SDK for creating high-performance, high-fidelity mobile apps for iOS and Android. The code is based on flutter version 1. Easily add staggered animations to your ListView, GridView, Column and Row children as shown in Material Design guidelines. Tensor Programming excelent programming videos, regularly posts Flutter tutorials. Widgets in Flutter can be Stateful or Stateless, depending on whether they depend on some state. builder in the sense that. Easily add staggered animations to your ListView, GridView, Column and Row children as shown in Material Design guidelines. Material Components (MDC) help developers implement Material Design. A while ago, I wrote an article on the basics of using a ListView and GridView in Flutter. Flutter- Screen push and pop with Navigator. We’ve covered the main ListView types above, but they were pretty plain. 3 ScrollDirection1. We've covered the main ListView types above, but they were pretty plain. Be sure to check the FlutterFire GitHub page for the most up-to-date list of FlutterFire plugins. All of this is possible by creating Flutter plugins. The MyStatefulWidget class manages its own state, so it overrides createState() to create the State object. You need to be cautious before upgrading. Awesome Flutter Snippets is a collection of commonly used Flutter classes and methods. There are 8 steps in this animation because each of the four bars makes a 180degree pivot twice, and by the end of the animation they've all turned a full turn. Flutter Flute Music Plugin - First Open Source Flutter based material design music player with audio plugin to play local music files. 11 Flutter: Sliding menu using a Drawer. Enjoys sunny beaches far from home. When there is insufficient space to support tabs, Drawers provide a handy alternative. The drawer is composed of 2 things: a hamburger menu button and a drawer with the list of options for the app. API docs for the AnimatedIcon class from the material library, for the Dart programming language. The code is based on flutter version 1. Creating flavors of a Flutter app (Flutter & Android setup) How to scroll to a position in Flutter ListView? How to overlay text and icon on an image in Flutter How to know when user has tapped the back button or back navigation arrow in Flutter Flutter widget tests: a practical example. com/watch?v=1LGKZsff8bQSource code: https://github. Splash is the grayed animated. Animations in Flutter 1. I mean, even if you compile the release version of your app, if you try to slowly scroll a ListView you can definitely tell that there is a delay from when you start to scroll to when the List starts to move (it's so evident in each flutter app you can find on play store, and it simply doesn't happen in a native app with some scrollable lists. , Flutter supports its through scoped_model. Flutter Drawer: We have two primary options for navigation: tabs and drawers. Documentation and code for building toggle buttons on Flutter. A quick Android example with code snippet to demonstrate creating a ListView parallax effect with a sticky header. Use the below code to create ListView with ListView constructor and ListTile widget:. In the image URLs, I've told Unsplash to return images with a width of 400px. Be sure to check the FlutterFire GitHub page for the most up-to-date list of FlutterFire plugins. Udemy Provide 30 Day Money Back Guarantee. You generally put a well designed image in splash screen in android app. 13 Flutter: JSON Storage. Allows you to retrieve exceptions of an Android Wear app in your handheld's one. This Code from Main. app state − Last for entire application like logged in user details, cart information, etc. Android SearchView is used to create a Search interface for the user. Tap an item to select it, tap it again to unselect. Inside the ListView children, add an icon before the username so it will be like this : ListView( children: [icon, username, password, submitButton], ), Save, and you should now see our image asset on top of username field. In this article, the same visual effect of Layout Animation will be applied on ListView and ListActivity. In this video, see how to use the Flutter animation controller to create custom animation. Awesome Flutter Snippets is a collection of commonly used Flutter classes and methods. Compared with Xamarin, different experts having contrasting opinions on the two frameworks. Android value animator example In this tutorial we will learn how to animate a value in android. Poznan Flutter Developer Group Agenda - Animation types - Tween animations, physics-based animation - Animated Container widget - Animated CrossFade widget - Hero animation - Flare overview - FlareActor, NimaActor - Expressive animations 2 For animated version of this presentation. 在Flutter中,用ListView来显示列表项,支持垂直和水平方向展示,通过一个属性我们就可以控制其方向 1. Flutter conveniently provides a StreamBuilder widget that can automatically update what the user sees in the app based on the contents of a stream. Widgets are UI elements, you put together, like building blocks, to build your UI. You Will Learn Flutter Vertical ListView. If you continue to use this site we will assume that you are happy with it. ListView Animation in Flutter. Introduction. You Will Build Real World Flutter Web Application. Starting from a simple idea, the framework evolves this idea into objects that can be chained and composited to make jaw dropping animations. another possible approach would be to be able to correctly estimate the height of the rows upfront and provide a correct offset to the jumpTo method. If you encounter any problems feel free to. This is a plugin for flutter_map package. Listview & Adapter ListView在Flutter中相当于什么. shrinkWrap多用于嵌套listView中 内容大小不确定 比如 垂直布局中 先后放入文字 listView (需要Expend包裹否则无法显示无穷大高度 但是需要确定listview高度 shrinkWrap使用内容适配不会有这样的影响)原文. Subclass StatefulWidget and State. Please refer to the flutter docs for more information. Tap an item to select it, tap it again to unselect.