main.dart
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'This is a Slide Example',
home: Scaffold(
appBar: AppBar(
title: Text('ABC'),
),
body: Column(children: [
Padding(
child: Text(
'This is a Slide Example',
style: TextStyle(fontSize: 20),
),
padding: EdgeInsets.all(50),
),
SlideExample(),
RangeSliderExample()
])));
}
}
class SlideExample extends StatefulWidget {
@override
_Slider1State createState() => _Slider1State();
}
class _Slider1State extends State {
double rating = 0;
@override
Widget build(BuildContext context) {
// TODO: implement build
return Slider(
label: "$rating",
divisions: 10,
value: rating,
onChanged: (newRating) {
setState(() => rating = newRating);
},
);
}
}
class RangeSliderExample extends StatefulWidget {
@override
_RangeSliderExampleState createState() => _RangeSliderExampleState();
}
class _RangeSliderExampleState extends State {
var selectedRange = RangeValues(0.2, 0.8);
@override
Widget build(BuildContext context) {
// TODO: implement build
return RangeSlider(
values: selectedRange,
onChanged: (RangeValues newRange) {
setState(() {
selectedRange = newRange;
});
},
);
}
}
flutter Slide拖动滑条
2019/11/04 by Leave a Comment
空闲时间用Flutter写的安卓APP 金庸武侠小说集离线版
2019/10/25 by Leave a Comment
空闲时间用Flutter写的安卓APP 金庸武侠小说集离线版 ，Google Play上架中，APK版本直接下载:
Flutter Widget创建时运行异步操作
2019/09/18 by 2 Comments
样例代码
import 'package:flutter/material.dart';
import 'dart:async';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
// TODO: implement build
return MaterialApp(
home: Scaffold(
body: Center(child: AsyncTest()),
));
}
}
class AsyncTest extends StatefulWidget {
@override
_AsyncTestState createState() => _AsyncTestState();
}
int getNumber(int n) {
if (n == 0) {
return 0;
} else if (n == 1) {
return 1;
} else {
return getNumber(n - 1) + getNumber(n - 2);
}
}
Future loadAsset(BuildContext context) async {
return await DefaultAssetBundle.of(context)
.loadString('assets/novels/0-1.txt');
}
class _AsyncTestState extends State {
bool loading = true;
@override
void initState() {
super.initState();
loadAsset(context).then((result) {
debugPrint(
'consume cpu time function result is ' + getNumber(20).toString());
Future.delayed(Duration(seconds: 1)).then((result) {
setState(() {
loading = false;
});
});
});
}
@override
Widget build(BuildContext context) {
// TODO: implement build
if (loading == true) {
return CircularProgressIndicator();
}
return Text('load finished ');
}
}
几点说明：
- 使用StatefulWidget 有状态Widget
- 在initState函数中执行异步操作
- 保证在已有结果的状态下调用setState
参考：
https://flutter.institute/run-async-operation-on-widget-creation/
git npm brew yarn 配置proxy
2019/06/14 by Leave a Comment
all export https_proxy=http://127.0.0.1:6152 export http_proxy=http://127.0.0.1:6152 export all_proxy=socks5://127.0.0.1:6153 git npm brew yarn 配置代理 //git列出 git config --global http.proxy //git设置 git config --global http.proxy 'socks5://127.0.0.1:6153' //git取消设置 git config --global --unset http.proxy npm //列出所有配置 npm config ls -l //列出 npm config list //设置 npm config set https-proxy http://127.0.0.1:6152 npm config set proxy http://127.0.0.1:6152 //npm 取消配置 npm config list delete https-proxy npm config set proxy //yarn 列出 yarn config list //yarn 设置 yarn config set proxy http://127.0.0.1:6152 yarn config set https-proxy http://127.0.0.1:6152 //yarn 取消配置 yarn config delete proxy yarn config delete https-proxy //brew 列出 all_proxy=socks5://127.0.0.1:6153 brew install mysql
flutter pub get缓慢解决方案
2018/09/06 by Leave a Comment
flutter pub get缓慢解决方案
windows
set PUB_HOSTED_URL=https://pub.flutter-io.cn set FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn flutter pub get
Linux MACOS
export PUB_HOSTED_URL=https://pub.flutter-io.cn export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn flutter pub get
