Question

抓取json。

Future<Pwa> _futurePwa;
Future<Pwa> getPwa() async {
      debugPrint("getPwa start");
      String urlX = 'https://' + urlOne.text;
      category ='PWA';
      locale = 'se';
      strategy = 'mobile'; 
      String baseUri = "https://www.googleapis.com/pagespeedonline/v5/runPagespeed?url=$urlX&category=$category&strategy=$strategy&locale=$locale";
      http.Response response = await http.get(baseUri);
      if (response.statusCode == 429) {
        debugPrint('PAUSE QUOTA EXCEEDED: ${response.statusCode}'); //OK
      }
      else if (response.statusCode == 200) {
        debugPrint('Response status: ${response.statusCode}'); //OK
        debugPrint('Response body:');
        debugPrint(response.body);
        return Pwa.fromJson(await json.decode(response.body));
      }
      else {
        throw Exception('Failed to load API data.');
      }
    }

Container (
                    child: new FutureBuilder<Pwa> (
                          future: _futurePwa,
                          builder: (context, AsyncSnapshot<Pwa> snapshot) {
                            if (snapshot.hasData) {

                              debugPrint("Futurebuilder<Pwa> buildpart");
                              debugPrint("Test snapshot content: ${snapshot.data
                                  .toString()}");
                              debugPrint(return Text('Res: ${snapshot.data.lighthouseResult.finalUrl}');
                            } else if (snapshot.hasError) {
                              debugPrint("T9-e ${snapshot.error}");
                              return Text("${snapshot.error}");
                            } else {

snapshot.hasError引发： 类型“ double”不是类型“ int”的子类型

我可以看到，如果进行整数除法，可能会发生这种情况，而我不是。这通常会运行，但是如果我多次运行int，我的futureBuilder会产生错误并抛出错误。这是否意味着在解析getPwa（）时出现类型错误，或者是因为我再次使用了Future？

Flutter Snapshot.hasError引发类型“ double”不是类型“ int”的子类型

0 个答案: