flutter-layout

问题 I've been investigating SliverAppBar, CustomScrollView, NestedScrollView, SliverPersistentHeader, and more. I cannot find a way to build something like the Instagram user profile screen's header where only the tab bar is pinned. The main body of the screen is a TabBarView and each pane has a scrollable list. With SliverAppBar, it is easy to add the TabBar in the bottom parameter. But I want to have an extra widget of unknown/variable height above that TabBar. The extra widget should scroll

问题 I'm using onpressed() to scroll down to bottom of the List view, but i want to achieve that without Pressing the botton, It must autoscroll for every screen opening. I tried to put it inside initState() its not working but if i press the button it wokrks How to make it autoScroll? Working code: floatingActionButton: new FloatingActionButton(child: Icon(Icons.arrow_downward),onPressed:_hola,) _hola(){ print("inti state started successfully"); controller1.animateTo( controller1.position

问题 I was looking for code which can set orientation of my flutter app landscape forcefully. 回答1: Enable forcefully Import package: import 'package:flutter/services.dart'; in main.dart file 1. Landscape mode: // Set landscape orientation SystemChrome.setPreferredOrientations([ DeviceOrientation.landscapeLeft, DeviceOrientation.landscapeRight, ]); 2. Portrait mode: // Set portrait orientation SystemChrome.setPreferredOrientations([ DeviceOrientation.portraitDown, DeviceOrientation.portraitUp, ]);

问题 i can't able to use curved navigation bar in flutter, when i slide screen so buttons of curved navigation bar are also moving but when i tap on buttons of curved navigation bar nothing happens . i think onTap() didn't work properly. how to navigate pages when i tap buttons? here is the code of my program=> static final String id = 'profile_page'; @override _PagesState createState() => _PagesState(); } class _PagesState extends State<Pages> { PageController _pageController; int _Page=0;

问题 I want a container to be of a color, that comes from sharedpreference or something like that! Is there a widget to solve this!! Or can I just do this with sharedpreference!! If I can! How? 回答1: With flutter SharedPreferences plugin you can only save String, int, StringList, double, Bool . A work around would be to save the RGBO value of the color in SharedPreferences , this would work for Android and iOS. Step 1. Install the plugin pubspec.yaml Add SharedPreferences to your pubspec.yaml file.

问题 I want a container to be of a color, that comes from sharedpreference or something like that! Is there a widget to solve this!! Or can I just do this with sharedpreference!! If I can! How? 回答1: With flutter SharedPreferences plugin you can only save String, int, StringList, double, Bool . A work around would be to save the RGBO value of the color in SharedPreferences , this would work for Android and iOS. Step 1. Install the plugin pubspec.yaml Add SharedPreferences to your pubspec.yaml file.

问题 I want a container to be of a color, that comes from sharedpreference or something like that! Is there a widget to solve this!! Or can I just do this with sharedpreference!! If I can! How? 回答1: With flutter SharedPreferences plugin you can only save String, int, StringList, double, Bool . A work around would be to save the RGBO value of the color in SharedPreferences , this would work for Android and iOS. Step 1. Install the plugin pubspec.yaml Add SharedPreferences to your pubspec.yaml file.

问题 I already had android studio and the android sdk installed,I later added flutter and flutter sdk. Here is my problem: When I run > flutter doctor It show's that I do not have Android SDK installed. 回答1: You can configure the Android SDK for your project using flutter config --android-sdk /path/to/android/sdk The PATH variable also should contain the SDK like export PATH=$PATH:/usr/local/opt/android-sdk/emulator:/usr/local/opt/android-sdk/build-tools/26.0.1:/usr/local/opt/android-sdk/platform

问题 I already had android studio and the android sdk installed,I later added flutter and flutter sdk. Here is my problem: When I run > flutter doctor It show's that I do not have Android SDK installed. 回答1: You can configure the Android SDK for your project using flutter config --android-sdk /path/to/android/sdk The PATH variable also should contain the SDK like export PATH=$PATH:/usr/local/opt/android-sdk/emulator:/usr/local/opt/android-sdk/build-tools/26.0.1:/usr/local/opt/android-sdk/platform

问题 I'm trying to overlap a SliverList a few pixels over the SliverAppBar . Similar to this post. I'd like the image in the FlexibleSpaceBar to go under the radius of my SliverList . I'm attempting to achieve the below. I can only get the radius like so. Without the ability to overlap the SliverList onto he SliverAppBar . @override Widget build(BuildContext context) { return Scaffold( body: CustomScrollView( slivers: <Widget>[ SliverAppBar( floating: false, expandedHeight: MediaQuery.of(context)