更新时间:2022-05-02 08:09:56
Harnish,需要更多细节以调试此错误.
Harnish, need a few more details in-order to debug this error.
可能的解决方案:
如果您在本地运行服务器并使用 Android 模拟器,那么您的服务器端点应该是 10.0.2.2:8000
而不是 localhost:8000
作为 AVD 使用10.0.2.2
作为主机环回接口的别名(即)localhost
If you're running the server locally and using the Android emulator, then your server endpoint should be 10.0.2.2:8000
instead of localhost:8000
as AVD uses 10.0.2.2
as an alias to your host loopback interface (i.e) localhost
期货注意事项
我注意到上面的代码正在使用 await 然后在同一行上.这可能会令人困惑,需要明确的是,await
用于暂停执行直到未来完成,而 then
是在未来完成后执行的回调函数.也可以写成下面这样
I noticed above that the code is using await and then on the same line. This can be confusing, to be clear, await
is used to suspend execution until a future completes, and then
is a callback function to execute after a future completed. The same could be written as below
void myFunction() async {
var data = {};
var response = await http.post(URL, headers:headers, body:data);
if (response.statusCode == 200) {
print(reponse.body);
} else {
print('A network error occurred');
}
}
或非 async/await 方法
or the non async/await method
void myFunction() {
var data = {};
http.post(URL, headers:headers, body:data)
.then((response) => print(response.body))
.catchError((error) => print(error));
}
有关 Dart 中期货的更多详细信息,请阅读https://www.dartlang.org/tutorials/language/futures
For a more detailed information on Futures in Dart please read https://www.dartlang.org/tutorials/language/futures