Await future for a specific time

问题

How would you wait for future response for a specific amount of time?

Say, we make a http post request and await for its response before we close the http request, but, we wait for only 3 secs, else we close the request.

How would you achieve that?

Something like

Future makePostReq() async{
  .... 

  await http response for 3 secs

  .... 

 if(response) {
  ... Do something with it
 }

 Http.close

} 

回答1:

You can use Future.any constructor to make a race condition

final result = await Future.any([
  Future.value(42),
  Future.delayed(const Duration(seconds: 3))
]);

You can also use Future.timout method

final result = await Future.value(42).timeout(const Duration(seconds: 3));

来源：https://stackoverflow.com/questions/52672137/await-future-for-a-specific-time