将考虑丢失的 Gc 直方图窗口的数量从 101 减少到 100

Question

我正在尝试构建一个天气应用程序，作为我正在学习的 Flutter 课程的一部分，并有一条消息指出：

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将考虑丢失的 Gc 直方图窗口的数量从 101 减少到 100

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当我期待天气数据时，它出现在我的控制台中。有人熟悉这条消息吗？

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我粘贴下面涉及的屏幕中的代码，以供参考。

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location_screen.dart

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import 'package:flutter/material.dart';\nimport 'package:clima/utilities/constants.dart';\n\nclass LocationScreen extends StatefulWidget {\n  LocationScreen({this.locationWeather});\n  final locationWeather;\n  @override\n  _LocationScreenState createState() => _LocationScreenState();\n}\n\nclass _LocationScreenState extends State<LocationScreen> {\n  @override\n  void initState() {\n    super.initState();\n    print(widget.locationWeather);\n  }\n\n  @override\n  Widget build(BuildContext context) {\n    return Scaffold(\n      body: Container(\n        decoration: BoxDecoration(\n          image: DecorationImage(\n            image: AssetImage('images/location_background.jpg'),\n            fit: BoxFit.cover,\n            colorFilter: ColorFilter.mode(\n                Colors.white.withOpacity(0.8), BlendMode.dstATop),\n          ),\n        ),\n        constraints: BoxConstraints.expand(),\n        child: SafeArea(\n          child: Column(\n            mainAxisAlignment: MainAxisAlignment.spaceBetween,\n            crossAxisAlignment: CrossAxisAlignment.stretch,\n            children: <Widget>[\n              Row(\n                mainAxisAlignment: MainAxisAlignment.spaceBetween,\n                children: <Widget>[\n                  FlatButton(\n                    onPressed: () {},\n                    child: Icon(\n                      Icons.near_me,\n                      size: 50.0,\n                    ),\n                  ),\n                  FlatButton(\n                    onPressed: () {},\n                    child: Icon(\n                      Icons.location_city,\n                      size: 50.0,\n                    ),\n                  ),\n                ],\n              ),\n              Padding(\n                padding: EdgeInsets.only(left: 15.0),\n                child: Row(\n                  children: <Widget>[\n                    Text(\n                      '32\xc2\xb0',\n                      style: kTempTextStyle,\n                    ),\n                    Text(\n                      '\xe2\x98\x80\xef\xb8\x8f',\n                      style: kConditionTextStyle,\n                    ),\n                  ],\n                ),\n              ),\n              Padding(\n                padding: EdgeInsets.only(right: 15.0),\n                child: Text(\n                  "It's  time in San Francisco!",\n                  textAlign: TextAlign.right,\n                  style: kMessageTextStyle,\n                ),\n              ),\n            ],\n          ),\n        ),\n      ),\n    );\n  }\n}\n/*\n\ndouble temperature = decodedData['main']['temp'];\nint condition = decodedData['weather'][0]['id'];\nString cityName = decodedData['name'];\n*/\n

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加载屏幕.dart

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import 'package:clima/screens/location_screen.dart';\nimport 'package:clima/services/networking.dart';\nimport 'package:flutter/material.dart';\nimport 'package:clima/services/location.dart';\nimport 'package:clima/services/networking.dart';\nimport 'package:flutter_spinkit/flutter_spinkit.dart';\nimport 'location_screen.dart';\n\nconst apiKey = 'APIKEY';\n\nclass LoadingScreen extends StatefulWidget {\n  @override\n  State<StatefulWidget> createState() {\n    return _LoadingScreenState();\n  }\n}\n\nclass _LoadingScreenState extends State<LoadingScreen> {\n  double latitude;\n  double longitude;\n\n  @override\n  void initState() {\n    super.initState();\n    getLocation();\n  }\n\n  void getLocationData() async {\n    Location location = Location();\n    await location.getCurrentLocation();\n    latitude = location.latitude;\n    longitude = location.longitude;\n    NetworkHelper networkHelper = NetworkHelper(\n        'https://api.openweathermap.org/data/2.5/weather?lat=$latitude&lon=$longitude&appid=$apiKey');\n    var weatherData = await networkHelper.getData();\n\n    Navigator.push(\n      context,\n      MaterialPageRoute(\n        builder: (context) {\n          return LocationScreen(\n            locationWeather: weatherData,\n          );\n        },\n      ),\n    );\n  }\n\n  @override\n  Widget build(BuildContext context) {\n    return Scaffold(\n      body: Center(\n        child: SpinKitDoubleBounce(\n          color: Colors.white,\n          size: 100.0,\n        ),\n      ),\n    );\n  }\n}\n\n

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网络.dart

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import 'package:http/http.dart' as http;\nimport 'dart:convert';\n\nclass NetworkHelper {\n  NetworkHelper(this.url);\n\n  final String url;\n\n  Future getData() async {\n    http.Response response = await http.get(url);\n    if (response.statusCode == 200) {\n      String data = response.body;\n\n      return jsonDecode(data);\n    } else {\n      print(response.statusCode);\n    }\n  }\n}\n

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Answer 1

您应该断开您的应用程序。如果您正在使用设备或模拟器，请将其从设备或模拟器中删除，然后再次冷启动您的应用程序。它会工作得很好。它在我的设备上对我有用。