此方法不返回任何数据
Future getProposals(String address,String id) async {
await _getProposals(address,id);
}
更改为
Future getProposals(String address,String id) {
return _getProposals(address,id);
}
这也将工作，但在这里async和await是redunant
Future getProposals(String address,String id) async {
return await _getProposals(address,id);
}
对于_getProposals你可以使用Completer
``` Future _getProposals(String address,String id) async { if(address != “”) { Completer completer = new Completer();
autocompleteService.getPlacePredictions(
new AutocompletionRequest()
..input = address
,
(predictions,status) {
List<String> result = [];
if(status == PlacesServiceStatus.OK) {
predictions.forEach(
(AutocompletePrediction prediction) =>
result.add(prediction.description)
);
}
// HERE is the problem: How do I return this result from the callback as a result of the getProposals method?
completer.complete(result);
}
);
return completer.future;
}
return null;
} ```
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