Context, viewId: number, args: Object): PlatformView { return new CustomView(context, viewId, args, this.message); // 导出自定义的原生视图 } } (4)创建CustomPlugin类,用于应用启动时注册插件并将工厂类CustomFactory传递到Flutter侧。 收起 深色代码主题 复制 export class CustomPlugin implements ...
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...
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...
class MyApp extends StatelessWidget { const MyApp({super.key}); @override Widget build(BuildContext context) { return const MaterialApp(title: 'Flutter Demo', home: MyHomePage()); } } class MyHomePage extends StatefulWidget { const MyHomePage({super.key}); @override State<MyHomePage> createSta...
classNativeFFI{NativeFFI._();staticDynamicLibrary? _dyLib;staticDynamicLibrarygetdynamicLibrary {if(_dyLib !=null)return_dyLib!;if(Platform.isMacOS || Platform.isIOS) {_dyLib = DynamicLibrary.process();}elseif(Platform.isAndroid) {_dyLib = DynamicLibrary.open('libnative_fun.so');}elseif(Pl...
class ProductScreen extends StatelessWidget { const ProductScreen({super.key}); @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: const Text("产品目录"), ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Image....
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...
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...
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...
GrContexts are matched one to one with OpenGL contexts or Vulkan devices. That is, all SkSurfaces that will be rendered to using the same OpenGL context or Vulkan device should share a GrContext. Skia does not create a OpenGL context or Vulkan ...