转换成未来流使用流。fromfuture镖

转换成未来流使用流。fromfuture镖

Future<String> futureTask() async {
  await Future.delayed(const Duration(seconds: 5));
  return 'Future complete';
}

final stream = Stream<String>.fromFuture(futureTask());
stream.listen(print,
    onDone: () => print('Done'), onError: print);

// Outputs:
// "Future complete" after 'futureTask' finished.
// "Done" when stream completed.