AdrianAndroid的专栏

资料Flutter之使用overlay显示悬浮控件类似于Toast的弹窗class Toast { // 自定义Toast static void show({ required BuildContext context, required String message, }) { // 创建一个OverlayEntry对象 OverlayEntry overlayEntry = new OverlayEntry(builder: (context) {

扩展在基本数据类型的应用extension IntExtension on int { toSay() { print('IntExtension Hello~'); }}extension StringExtension1 on String { // 字符串转换成Color对象 toColor() { var hexColor = this.replaceAll("#", ""); if (hexColor.length == 6) { hex

资源pigeon: ^1.0.17packages/packages/pigeonFlutter官方推荐插件开发辅助工具-Pigeon安装dart pub add pigeonpubspec.yamldependencies: flutter: sdk: flutter pigeon: ^1.0.7 ...步骤1. 创建一个messages.dart模版文件messages.dartimport 'package:pigeon/pigeon.dart';cl

WillPopScope

资料githubgit@github.com:AdrianAndroid/flutter_project.git分支 : learn-futurebuilder步骤在widget中创建FutureBuilder小组件Center( child : FutureBuilder<String> ( future : Future<String>, // 将要运行的Future<String>, 范型是一样的 initialData : 'App Name

资料官方文档源码pubspec.yamlname: flutter_projectdescription: A new Flutter project.publish_to: 'none' # Remove this line if you wish to publish to pub.devversion: 1.0.0+1environment: sdk: '>=2.12.0 <3.0.0'dependencies: dio: ^4.0.4 cupertino_i

资料Mirgating to null safety步骤在命令行输入如下命令，检查依赖状态dart pub outdated --mode=null-safety如果需要更新dart pub getMigratedart migrate

资料Flutter中的Provider(五)-异步刷新-FutureProvider代码import 'package:flutter/foundation.dart';import 'package:flutter/material.dart';import 'package:provider/provider.dart';void main() => runApp(MyApp());// class Home {// final String city = "Portlan

资料暂无代码import 'dart:async';import 'package:flutter/material.dart';import 'package:provider/provider.dart';void main() { runApp(MyApp());}class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { // return Stre

InheritedWidget

最简单的使用上代码import 'package:flutter/material.dart';void main() { runApp(MyApp());}class MyApp extends StatelessWidget { // This widget is the root of your application. @override Widget build(BuildContext context) { return MaterialApp(

大家有没有遇到过这种情况， prefixIcon中国添加了饿Row，导致覆盖了整个Field区域。后来发现设置了mainAxisSize: MainAxisSize.min这个属性之后，就可以满足条件了以下是完整代码，仅供参考:ThemeButton _buildPrefixButton() { return ThemeButton( onPressed: () async { if (widget.onPressSelectCountry != null) {

资料搭建Flutter Engine源码编译环境

资料Flutter异步编程-Future事件循环EventLoopEvent Queue 主要包含IO、手势、绘制、定时器(Timer)、Stream流以及本文所讲Future等MicroTask Queue 主要包含Dart内部的微任务(内部非常短暂操作)，一般是通过 scheduleMicroTask 方法实现调度，它的优先级比Event Queue要高事件循环执行的流程Future的几种情况1. factory Future(FutureOr computation())//F

逐步完善…资料Flutter学习笔记之Provider 5.0.0入门级使用

资料[macos] Flutter desktop app becomes unresponsive while trying to read a user directory #73551问题flutter: TAG scrcpy-x21[ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: ProcessException: Operation not permitted Command: scrcpy --wind

资料Flutter状态管理Provider，简单上手步骤第一步：添加provider依赖provider: ^2.0.1+1pub地址：https://pub.dev/packages/provider第二步：创建Modelimport 'package:provider/provider.dart';class Counter with ChangeNotifier {//1 int _count; Counter(this._count); void add() {

import 'package:flutter/cupertino.dart';import 'package:flutter/material.dart';class WrapWidget extends StatefulWidget { final String title; const WrapWidget({Key key, this.title}) : super(ke...

import 'package:flutter/cupertino.dart';import 'package:flutter/material.dart';class FlexWidget extends StatefulWidget { @override State<StatefulWidget> createState() { // TODO: imple...

1.3 Future.whenComplete 无论成功失败都要做一些事情。3.2 使用async/await 消除callback hell。3.1 可选的位置参数。3.2 可选的命名参数。

资料三、Flutter基础—ListView入门基础用法import 'package:flutter/cupertino.dart';import 'package:flutter/material.dart';class ListViewPage extends StatefulWidget { @override State<StatefulWidget> c...

#资料基本import 'package:flutter/cupertino.dart';import 'package:flutter/material.dart';class GridViewWidget extends StatelessWidget { @override Widget build(BuildContext context) { return S...

class CustomScrollViewWidget extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( body: CustomScrollView( slivers: <Widget>[ ...

A basic Dart program// Define a function.printInteger(int aNumber) { print('The number is $aNumber.'); // Print to console.}// This is where the app starts executing.main() { var number = 42...

SampleWidget build(BuildContext context) { return Center( child: Column( mainAxisSize: MainAxisSize.min, children: <Widget>[ const RaisedButton( onPressed: n...

0Sampledouble _volume = 0.0;// ...Widget build(BuildContext context) { return Scaffold( body: Center( child: Column( mainAxisSize: MainAxisSize.min, children: <Wid...

SampleWidget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Floating Action Button Sample'), ), body: Center( child: Text('Press the button belo...

Add the http packageMake a network request using the http package.Convert the response into a list photosMove this work to a separate isolate.1. Add the http packagedependencies: http: <la...

#SampleFlatButton( color: Colors.blue, textColor: Colors.white, disabledColor: Colors.grey, disabledTextColor: Colors.black, padding: EdgeInsets.all(8.0), splashColor: Colors.blueAccent,...

Specifying assetspubspec.yamlflutter: assets: - assets/my_icon.png - assets/background.pngflutter: assets: - assets/Asset bundlingAsset variants .../pubspec.yaml .../graphics...

This recipe uses the following steps.Add the http package.Make a network request using the http package.Convert the response into a custom Dart object.Fetch and display the data with Flutter.1....

Add authorization headersFuture<http.Response> fetchPost() { return http.get( 'https://jsonplaceholder.typicode.com/posts/1', // Send authorization headers to the backend. headers...

Flutter Go 代码开发规范 0.1.0 版代码风格标识符三种类型大驼峰类、枚举、typedef和类型参数 class SliderMenu { ... } class HttpRequest { ... } typedef Predicate = bool Function<T>(T value);包括用于元数据注释的类 class Fo...

VSCode先运行flutter的时候出现白屏命令行出现如下错误：E/flutter ( 2918): [ERROR:flutter/shell/gpu/gpu_surface_gl.cc(58)] Failed to setup Skia Gr context.这是在x86情况下遇到的问题。配置下命令行就可以了找到Add Configuration配置选项添加Dart/Flutte...

资料Flutter 控件之 ScaffoldWidgetScaffoldScaffold 有下面几个主要属性：appBar：显示在界面顶部的一个 AppBar，也就是 Android 中的 ActionBar 、Toolbarbody：当前界面所显示的主要内容 WidgetfloatingActionButton：纸墨设计中所定义的 FAB，界面的主要功能按钮persistent...

SampleString dropdownValue = 'One';// ...Widget build(BuildContext context) { return Scaffold( body: Center( child: DropdownButton<String>( value: dropdownValue, ...

#Samplefinal _formKey = GlobalKey<FormState>();@overrideWidget build(BuildContext context) { return Form( key: _formKey, child: Column( crossAxisAlignment: CrossAxisAlignment...

Creating a stateful widgetStep 0: Get readyStep1: Decide which object manages the widget’s stateStep2: Subclass StatefulWidgetclass FavoriteWidget extends StatefulWidget { @override _FavoriteW...

import 'package:flutter/material.dart';void main() { runApp(MaterialApp( title: 'Returning Data', home: HomeScreen(), ));}class HomeScreen extends StatelessWidget { @override Widg...

import 'package:flutter/foundation.dart';import 'package:flutter/material.dart';void main() => runApp(MyApp());class MyApp extends StatelessWidget { MyApp({Key key}) : super(key: key); @o...