This is a weird problem, when using an emulator, the data from OpenWeatherMap is displayed on the screen as it should. It has no errors with fetching data. But, when I create an apk from Build -> Flutter -> Build Apk (using Idea), it doesn't fetch data for some reason. And normally, it displays null.

Weather Controller:

class WeatherController extends GetxController {
  final WeatherService _weatherService = Get.find();

  Rxn<WeatherData> weatherData = Rxn();

  String get address =>
      "${weatherData.value?.name}, ${weatherData.value?.country}";

  String get temperature => "${weatherData.value?.temp}";

  String get icon => "${weatherData.value?.icon}";

  @override
  void onInit() async {
    super.onInit();
    getWeather();
  }

  Future<void> getWeather() async {
    final response = await _weatherService.getWeatherForLocation();
    if (response != null) {
      weatherData.value = response;
    } else {
      Get.defaultDialog(
          middleText: 'Error fetching weather data from API',
          textConfirm: 'OK',
          confirmTextColor: Colors.white,
          onConfirm: () {
            Get.back();
          });
    }
  }
}

Weather Service:

class WeatherService {
  final apiKey = "7e23369c183254302bda0471cc3f848c";
  final LocationController _locationController = Get.find();

  Future<WeatherData?> getWeatherForLocation() async {
    WeatherData? weatherData;

    var params = {
      "lat": _locationController.currentLocation.value?.latitude.toString(),
      "lon": _locationController.currentLocation.value?.longitude.toString(),
      "appId": apiKey,
    };
    var url = Uri.http('api.openweathermap.org', '/data/2.5/weather', params);
    final response = await get(url);

    if (response.statusCode == HttpStatus.ok) {
      var jsonResponse = jsonDecode(response.body) as Map<String, dynamic>;
      weatherData = WeatherData.fromJson(jsonResponse);
      print("Request successful: $jsonResponse");
      return weatherData;
    } else {
      print("Request failed with status: ${response.statusCode}");
      return weatherData;
    }
  }
}

Weather Model:

class WeatherData {
  int? temp;
  String? icon;
  String? name;
  String? country;

  WeatherData({
    this.temp,
    this.icon,
    this.name,
    this.country,

  });

  WeatherData.fromJson(dynamic json) {
    var tempInKelvin = json["main"]["temp"];
    temp = (tempInKelvin - 273.15).round();
    icon = json["weather"][0]["icon"];
    name = json["name"];
    country=json["sys"]["country"];

  }
}

Update:

the problem is that openweathermap api needs location that I'm getting from Geolocator package, and that takes time to happend. It works on a simulator because location is always the same (default), but on the real phone, where geolocator must be used, it isn't as fast, so that's why I'm getting null as a response (cause my latitude and longitude are null when I'm passing them to Weather Service).

It doesn't load on first render.

CodePudding user response：

This could be because your release app might be missing internet permissions.

Go to android > app > src > main > Add the following line in your AndroidManifest.xml file before the <application> section:

<uses-permission android:name="android.permission.INTERNET" /> 

CodePudding user response：

had to check if location is null in home controller (for home screen), and then send location again

class HomeController extends GetxController {
      RxList<NearbyMountainDto> nearbyMountainsObx = RxList.empty();
      RxList<NearbyMountainDto> popularMountainsObx = RxList.empty();
      final LocationController _locationController=Get.find();
      final WeatherController _weatherController=Get.find();

  @override
  void onInit() {
    if(_locationController.currentLocation.value == null) {
      _awaitLocation().then((value) {
        if(value) {
          _weatherController.getWeather();
          _weatherController.address;
          _weatherController.temperature;
          _weatherController.icon;
        }
      });
    } else {
      _weatherController.getWeather();
      _weatherController.address;
      _weatherController.temperature;
      _weatherController.icon;
    }
    super.onInit();
  }

  Future<bool> _awaitLocation() {
    return _locationController.setInitialLocation();
  }


}