在这里，我使用天气API。在调试时，它会出现错误，
我的flutter代码是：
String searchApiUrl = 'https://www.metaweather.com/api/location/search/?query=';
String locationApiUrl = 'https://www.metaweather.com/api/location/';
void fetchSearch(String input) async {
var searchResult = await http.get(Uri.parse(searchApiUrl + input), headers: {"Accept":
"application/json","Access-Control-Allow-Origin": "*"});
var result = json.decode(searchResult.body)[0];
setState(() {
location = result["title"];
woeid = result["woeid"];
});
}
void fetchLocation() async {
var locationResult = await http.get(Uri.parse(locationApiUrl + woeid.toString()),
headers: {"Accept": "application/json","Access-Control-Allow-Origin": "*"});
var result = json.decode(locationResult.body);
var consolidated_weather = result["consolidated_weather"];
var data = consolidated_weather[0];
setState(() {
temperature = data["the_temp"].round();
weather = data["weather_state_name"].replaceAll(' ','').toLowerCase();
});
}
void onTextFieldSubmitted(String input){
fetchSearch(input);
fetchLocation();
}
在fetchPlace中，您依赖于来自fetchSearch的woeid值，但您不必等待onTextFieldSub的中的结果。试试这个：
void onTextFieldSubmitted(String input) async {
await fetchSearch(input);
await fetchLocation(); // await in this line might not be needed
}
