child:constCustomOhosView()));// 直接使用CustomOhosView} @override Widgetbuild(BuildConte...
classDetailScreenextendsStatelessWidget{// Declare a field that holds the Todofinal Todo todo;// In the constructor, require a TodoDetailScreen({Key key,@requiredthis.todo}):super(key:key);@override Widgetbuild(BuildContext context){// Use the Todo to create our UIreturnnewScaffold(appBar:new...
在FLAG_timeline_streams 中非常多的类型值,每种都定义了不同的 Stream,初始化过程包括三个步骤:Declare Stream(申明)、Get Stream(获取)、Define Stream(定义)。 ✎Declare Stream /path/to/engine/src/third_party/dart/runtime/vm/timeline.h // stream 申明 #define TIMELINE_STREAM_DECLARE(name, fuchsia_...
class _Router extends IRouter { @override Future<bool> pop({ ... }) async { var context = GDNavigatorObserver.instance.navigator?.context; if (context != null && context.canPop()) { context.pop(); } else { GDPlugin.location.href('/'); } return true; } @override Future push( Str...
class MainActivity: FlutterActivity() { var sensorListener: SensorListener? = null override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) GeneratedPluginRegistrant.registerWith(this) sensorListener = SensorListener( getSystemService(Context.SENSOR_SERVICE) as SensorManager...
class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { // TODO: implement build return MaterialApp( title: "Flutter Layout Demo", home: Scaffold( appBar: AppBar( centerTitle: true, title: Text("Flutter Layout Demo"), ...
class _MyHomePageState extends State<MyHomePage> { int _counter = 0; void _incrementCounter() async { _counter = await NativeFun.add(_counter, 2); setState(() {}); } @override Widget build(BuildContext context) { return Scaffold( ...
class _MyHomePageState extends State<MyHomePage> { // function for test void func({@required String arg1, @required int arg2}) { print(arg1); print(arg2); } @override Widget build(BuildContext context) { // Ok,compile pass // 使用 @required 标记, 分析器会指出命名参数丢失, // 但对...
TRACE_EVENT0("flutter", "IOSContext::Create"); ... FML_CHECK(false); return nullptr; } 最终会反应在 Tracing 上,如下图: 后记 本文主要分析了 Tracing 在 Flutter 上的实现以及一些实践,Tracing 是 Chrome 实现的一种标准格式,任何技术栈的性能分析都可以生成这种标准格式,然后利用现成的 Chrome DevTool...
classMyActivity:FragmentActivity() {companionobject{// Define a tag String to represent the FlutterFragment within this// Activity's FragmentManager. This value can be whatever you'd like.privateconstvalTAG_FLUTTER_FRAGMENT ="flutter_fragment"}// Declare a local variable to reference the FlutterFr...