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Recent questions tagged Flutter

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flutter - How to use `GlobalKey` to maintain widgets' states when changing parents?

In Emily Fortuna's article (and video) she mentions: GlobalKeys have two uses: they allow widgets to change ... GlobalKey can help me with? See Question&Answers more detail:os...

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

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flutter - There are multiple heroes that share the same tag within a subtree

I am trying to navigate from one screen to another with route. When I hit the button for the page to move to the ... tag> How do I solve 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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flutter - How to change TextField's height and width?

How to customise TextField's width and height? See Question&Answers more detail:os...

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

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flutter - How to pass a boolean value from one class to another and back?

I am trying to use the Visibility widget to show and hide my page. Here is my logic when at the first page the ... true,); //doesn't work }, See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - Why is the Firebase Realtime Database's data appearing as null in the console?

I am trying to create a simple app that adds posts to a firebase realtime database and shows them ... BottomNavigationBarItem( icon: Icon(Icons.account_circle), title: Container(...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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flutter - Map of object containing a List<Object> for sqlite

I am setting up my model classes to confirm to the docs for sqflite which suggest including a named constructor ... would be much appreciated. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter doctor --android-licenses does not work

when I run flutter doctor I noticed license status is unknown. [√] Flutter (Channel stable, v1.0.0, on ... Any help would be great thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - The type 'StateNotifierProvider' is declared with 2 type parameters, but 1 type arguments were given

In the context of a Flutter 2.0.5 app whose state I'd like to manage with Riverpod, I thought I can declare ... (with flutter run -d Chrome). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - How to create a bounded scrollable TabBarView

I need to implement the following layout in Flutter. When the user scrolls, I want the entire layout to scroll ( ... header is fixed to the top. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - Duplicate GlobalKey detected in widget tree

I am running into a globalKey error after I navigate from Screen A to Screen B and click a "Cancel" ... ; _forgottenChildren.add(child); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - Could not open settings generic class cache for settings file '

I reinstalled my android studio since the sdk was not found and so on. After re installing java jdk and ... failed with exit code 1 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - Why can't I use context.read in build(), but I can use Provider.of with listen: false?

It's stated in the docs that these are the same, and context.read is just a shortcut for Provider.of<x>(context ... But it doesn't answer "why". See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

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flutter - How to set size to CircularProgressIndicator?

I'm trying to make a loading screen for my application, I'm using CircularProgressIndicator widget, but I want to ... someone help me with this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - firebase_messaging onResume and onLaunch not working

I am getting the notification when the app is in the foreground but not when the app in the background. Also, I ... arm64 ? Android 9 (API 28) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

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flutter - How to get full size of a ScrollController

I've attached a ScrollController to a CustomScrollView of [SliverAppBar, SliverList] In a default case I would use ... this value. Thank you ! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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flutter - How can I get the current date (w/o hour and minutes)?

All I can see in the documentation is DateTime.now() but it returns the Timespan also, and I need just the date. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.6k views

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flutter wrap text instead of overflow

When creating a Text widget with a long string in Flutter, it wraps its text when put directly in a Column. However, when it ... , ), ], ), ), ) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

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flutter - How to check if scroll position is at top or bottom in ListView?

I'm trying to implement a infinite scroll functionality. I tried using a ListView inside on a NotificationListener to ... way to achieve this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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flutter - How can I layout widgets based on the size of the parent?

Let's say you have a parent widget that might have a variable size. For example: var container = new Container( ... way to do this in Flutter? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

1 answer

flutter - How to make button width match parent?

I want to know that how can I set a width to match parent layout width new Container( width: 200.0, padding: const ... i dont know how to do it. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

1 answer

flutter ListView KeepAlive after some scroll

I want to keepAlive my widgets which are already rendered in ListView. I was tried with addAutomaticKeepAlives:true ... itemCount:40 , ); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.7k views

1 answer

flutter - Undefined class StorageReference when using Firebase Storage

i am trying to upload image, and the same process is working for my other app, but here it gives these errors, ... _image1 = firstImage; }); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.1k views

1 answer

flutter - How to show a line being drawn from one point to another?

I used canvas.drawLine to show a line but I want user to be able to see it being drawn from one point to ... bar but this is my custom widget) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.8k views

1 answer

flutter - Preserving state between tab view pages

issue I have two ListViews rendering inside of a TabBarView using a TabController. How do I preserve ... /media/2ysWhzqHVqL1xcBlBE/giphy.gif See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.8k views

1 answer

flutter - incorrect use of parent data widget. expanded widgets must be placed inside flex widgets

I am getting the following error: i.e.., Another exception was thrown: Incorrect use of ParentDataWidget. showing ... let me know the issue. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

1 answer

flutter - How to ensure my CustomPaint widget painting is stored in the raster cache?

I have an app that displays a black dot at the point where the user touches the screen like this: The black ... > other._offset != _offset; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.4k views

1 answer

flutter - Enumerate or map through a list with index and value in Dart

In dart there any equivalent to the common: enumerate(List) -> Iterator((index, value) => f) or List.enumerate() ... add(list[index], index) }); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.7k views

1 answer

flutter - How to Determine Screen Height and Width

I've created a new application on flutter, and I've had problems with the screen sizes when switching between ... is optimized for all screens? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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