air quality app flutter http api tutorial for beginners

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creating an air quality app using flutter and an http api is a great way to learn about mobile development and working with apis. in this tutorial, we will create a simple flutter application that fetches air quality data from an external api and displays it to the user.

we will be using the openweathermap api, which provides air quality data. you need to sign up for an api key at [openweathermap](https://home.openweathermap.org/users....

prerequisites

1. **flutter sdk**: ensure you have flutter installed on your machine. you can follow the official installation guide [here](https://flutter.dev/docs/get-started/....
2. **dart**: flutter comes with dart, so you don't need to install it separately.
3. **text editor/ide**: use any text editor or ide that supports flutter (like android studio, visual studio code, etc.).

step 1: create a new flutter project

open your terminal and run the following command:

```bash
flutter create air_quality_app
```

navigate to the project directory:

```bash
cd air_quality_app
```

step 2: add dependencies

open the `pubspec.yaml` file and add the `http` package. this package allows us to make http requests.

```yaml
dependencies:
flutter:
sdk: flutter
http: ^0.13.3
```

run the following command to get the dependencies:

```bash
flutter pub get
```

step 3: create the model

create a new file called `air_quality.dart` in the `lib` directory to define a model for the air quality data.

```dart
// lib/air_quality.dart

class airquality {
final double aqi; // air quality index

airquality({required this.aqi});

factory airquality.fromjson(mapstring, dynamic json) {
return airquality(
aqi: json['list'][0]['main']['aqi'].todouble(),
);
}
}
```

step 4: create the api service

create a new file called `api_service.dart` in the `lib` directory to handle api requests.

```dart
// lib/api_service.dart

import 'dart:convert';
import 'package:http/http.dart' as http;
import 'air_quality.dart'; ...

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Flutter tutorial
HTTP API
beginners guide
Flutter development
environmental data
API integration
mobile app tutorial
Dart programming
real-time air quality
RESTful services
Flutter widgets
JSON parsing
location tracking
user interface design