Flutter Maps is a powerful data visualization widget that displays statistical information for a geographical area. Its rich feature set includes tile rendering from OpenStreetMap, Azure Maps, Bing Maps, Google Maps, and other tile providers. It has marker support and shape layers with features lik...
s.dependency'Flutter's.dependency'SDWebImage's.platform=:ios,'8.0' Flutter脚手架自动为我们生成了NativeImageViewPlugin.m文件和registerWithRegistrar方法,该方法是组件执行的入口,会被Flutter的插件管理器自动调用。 我们在该方法中使用与Flutter端相同的name创建MethodChannel,并创建插件对象的实例,用于处理Flutter端的...
//定义路由Map<String,WidgetBuilder>datas={'/pageone':(builder){returnPageOne("数据1");},'/pagetwo':(builder)=>PageTwo("数据2"),'/pagethree':(builder){returnPageThree("数据3");},};classMyAppextendsStatelessWidget{@override Widgetbuild(BuildContext context){returnMaterialApp(title:'Flutter ...
Tooltip- You can enable tooltip for the shapes using theMapShapeLayer.shapeTooltipBuilderproperty. It will be called with the corresponding index every time when you interacts with the shapes i.e., while tapping in touch devices and hover enter in the mouse enabled devices. ...
(WeatherModel.fromMap(json.decode(s))); } }); // 再请求网络更新数据 _bloc.requestWeather(city).then((w) => _bloc.updateWeather(w)); return Scaffold( body: StreamBuilder( stream: _bloc.backgroundStream, initialData: _bloc.background, builder: (_, AsyncSnapshot themeSnapshot) => ...
tabs: tabs.map((e) => Tab(text: e)).toList(), ), ), 实现SearchDelegate import 'package:flutter/material.dart'; import 'package:flutter_screenutil/flutter_screenutil.dart'; class SearchBarDelegate extends SearchDelegate<String> { var nameList = ["完美世界", "西行记", "仙逆", "遮天", ...
var p2= new Person.withArgments('why',18); print(p2); 在之后的开发中, 我们也可以利用命名构造方法,提供更加便捷的创建对象方式。比如开发中,我们需要经常将一个Map转成对象,可以提供如下的构造方法 //新的构造方法Person.fromMap(Map<String, Object>map) { ...
imageName = imageName.substring(0,lastIndex); } String imageUri = "@drawable/"+imageName; int imageResource = context.getResources().getIdentifier(imageUri, null, context.getPackageName()); if(imageResource > 0){ Bitmap bmp = BitmapFactory.decodeResource(context.getResources(),imageResource...
String url = window.defaultRouteName;// route名称String route =url.indexOf('?') == -1 ? url : url.substring(0, url.indexOf('?'));// 参数Json字符串String paramsJson =url.indexOf('?') == -1 ? '{}' : url.substring(url.indexOf('?') + 1);// 解析参数Map<String, dynamic>...
Map使用时的泛型写法: // 创建Map的方式 var infos1 = {1: 'one', 'name': 'why', 'age': 18}; print(infos1.runtimeType); // _InternalLinkedHashMap<Object, Object> // 对类型进行显示 Map<String, String> infos2 = {'name': 'why', 'age': 18}; // 18不能放在value中 var infos3...