Calling the Weather API

Using the Weather API

This is a small Flutter App that explains the very basics of calling APIs. In this app we call the Weather API at (go and look up the site here)

Open Weather Map

Register yourself on the site and get an appid for yourself

API Keys

Here is a list of the available APIs

Weather APIs available

This link will give the currentweather of Varanasi (my hometown)

Varanasi Current Weather

The data is accessed via the http dart package which is hosted at

http.dart

The data is downloaded in JSON. To convert into a Dart Map we use the dart convert package

convert.dart

The relevant code is:

Future < bool > getWeather(String
cityname) async {
    String
apikey = "4a1f8a61b74546825af1e0be106e797b";
final
url = Uri.https("api.openweathermap.org", "/data/2.5/forecast",
                {'q': cityname, 'appid': apikey, 'units': 'metric'});

try {
final response = await http.get(url);

print(response);
print(response.statusCode);
final jsonResponse = convert.jsonDecode(response.body);
print(jsonResponse);
print(jsonResponse.runtimeType);
Map < String, dynamic > map = jsonResponse;
print(map.keys);
for (String key in map.keys) {
dynamic value = map[key];
print(key + " = " + value.toString());
}
print("icon" + map["list"][0]["weather"][0]["icon"].toString());
currenticon = map["list"][0]["weather"][0]["icon"].toString();

currentcitytemp = map["list"][0]["main"]["temp"].toString();
currentmaxtemp = map["list"][0]["main"]["temp_max"].toString();
currentmintemp = map["list"][0]["main"]["temp_min"].toString();
description = map["list"][0]["weather"][0]["description"].toString();
weatherfound = true;

return true;
} catch(ex)
{
print(ex);
weatherfound = false;
currentcitytemp = "-";
currentmaxtemp = "-";
currentmintemp = "-";
description = "-";
return false;
}
}

Type a city name and press the Get Weather button.

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