在切换屏幕时遇到问题

Question

我在切换屏幕时遇到问题。我不知道为什么Navigaotr.push命令不起作用。 除此之外，其他一切都可以正常工作，例如获取long，alt等。 除此之外，其他一切都可以正常工作，例如获取long，alt等。

实用程序类：

import 'package:flutter/material.dart';
import 'package:clima/screens/loading_screen.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark(),
      home: LoadingScreen(),
    );
  }
}

loading_Screen类：

import 'package:clima/screens/location_screen.dart';
import 'package:clima/services/networking.dart';
import 'package:flutter/material.dart';
import 'package:clima/services/location.dart';
import 'location_screen.dart';

const apiKey = '65c8f19a8cd46bb90e565af0a07cbd61';

class LoadingScreen extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _LoadingScreenState();
  }
}

class _LoadingScreenState extends State<LoadingScreen> {
  double latitude;
  double longitude;

  @override
  void iniState() {
    super.initState();
    getLocationData();
  }

  void getLocationData() async {
    Location location = new Location();
    await location.getCurrentLocation();

    latitude = location.latitude;
    longitude = location.longitude;
    print('got here');
    NetworkHelper networkHelper = NetworkHelper(
        'https://samples.openweathermap.org/data/2.5/weather?lat=$latitude&$longitude=139&appid=$apiKey');
    var weatherData = await networkHelper.getData();

    Navigator.push(context, MaterialPageRoute(builder: (context) {
      return LocationScreen();
    }));
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold();
  }
}

location_screen

等待后更改打印位置后

Launching lib\main.dart on Android SDK built for x86 in debug mode...
Initializing gradle...
Resolving dependencies...
Running Gradle task 'assembleDebug'...
Built build\app\outputs\apk\debug\app-debug.apk.
Installing build\app\outputs\apk\app.apk...
Syncing files to device Android SDK built for x86...
D/EGL_emulation(11532): eglMakeCurrent: 0x9e4051e0: ver 2 0 (tinfo 0x9e403400)

info: Method doesn't override an inherited method. (override_on_non_overriding_method at [clima] lib\screens\loading_screen.dart:21)
info: The value of the local variable 'weatherData' isn't used. (unused_local_variable at [clima] lib\screens\loading_screen.dart:36)
info: Avoid empty statements. (empty_statements at [clima] lib\services\networking.dart:16)
info: Dead code. (dead_code at [clima] lib\services\networking.dart:16)

Answer 1

收到错误的原因：

info：方法不会覆盖继承的方法。 （位于[clima] lib \ screens \ loading_screen.dart：21处的override_on_non_overriding_method）

是您创建了一个iniState（）函数而不是initState（）函数。