import 'dart:async'; Future<int> sumStream(Stream<int> stream) async { var sum = 0; await for (var value in stream) { sum += value; } return sum; } Stream<int> countStream(int to) async* { for (int i = 1; i <= t
- [runUnsynchronized](https://docs-flutter-io.firebaseapp.com/flutter/flutter_driver/FlutterDriver/runUnsynchronized.html)<T>([Future](https://docs-flutter-io.firebaseapp.com/flutter/dart-async/Future-class.html)<T> action(), { [Duration](https://docs-flutter-io.firebaseapp.com/flutter/dart...
setMessageHandle((message) async { // 通过async修饰的方法 返回值为Future, 而此返回Future<String> print('message') // 这个消息来自于native, "Hello,I'm Android" setState(()=> { // 重绘之前搞事情 }); // 返回信息给客户端 return "To native" }) } // 步骤二:通过EC实例 注册了一个...
//并发计算阶乘 Future<dynamic> asyncFactoriali(n) async{ final response = ReceivePort();//创建管道 //创建并发Isolate,并传入管道 await Isolate.spawn(_isolate,response.sendPort); //等待Isolate回传管道 final sendPort = await response.first as SendPort; //创建了另一个管道answer final answer = ...
Steps to Reproduce Run flutter app through Xcode Run flutter attach in terminal, wait for it to finish Quit the flutter attach by pressing q Run flutter attach again It should throw an error like this (may not be exactly the same dependi...
{ return Scaffold( appBar: AppBar( title: const Text('Butterfly Video'), ), // Use a FutureBuilder to display a loading spinner while waiting for the // VideoPlayerController to finish initializing. body: FutureBuilder( future: _initializeVideoPlayerFuture, builder: (context, snapshot) { ...
void main() async { IntegrationTestWidgetsFlutterBinding.ensureInitialized(); WidgetsFlutterBinding.ensureInitialized(); testWidgets('Smoke test', (WidgetTester tester) async { await tester.pumpWidget(MyApp()); // Create main app await tester.pumpAndSettle(); // Finish animations and scheduled micro...
sleep 并不会释放同步锁,而 wait 会释放同步锁 sleep 可以在任何地方使用,而 wait 只能在同步方法或者同步代码块中使用 sleep 中必须传入时间,而 wait 可以传,也可以不传,不传时间的话只有 notify 或者 notifyAll 才能唤醒,传时间的话在时间之后会自动唤醒 ...
问Flutter: storekit_duplicate_product_object。同一产品标识符有挂起的事务EN今天在查看项目代码时发现有...
以下示例通过使用async *函数生成简单的整数流来测试前面的代码: import 'dart:async'; Future<int> sumStream(Stream<int> stream) async { var sum = 0; await for (var value in stream) { sum += value; } return sum; } Stream<int> countStream(int to) async* { for (int i = 1; i <=...