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To use the OpenWeather API, you need to follow these steps:

https://www.weatherapi.com/

Last edited 484 days ago by Peter Sigurdson

1. Sign up for a free account on the OpenWeather website

2. Once you have signed up, you will receive an API key that you can use to access the OpenWeather API

3. Choose the API endpoint that you want to use. OpenWeather provides several APIs for different purposes, such as current weather data, weather forecasts, historical weather data, and more

4. Construct the API request URL by appending the necessary parameters to the base URL. The parameters depend on the API endpoint that you are using and the data that you want to retrieve

5. Send the API request using a programming language of your choice. You can use libraries or modules that provide functions for making HTTP requests and parsing JSON data

6. Parse the JSON response that you receive from the API and extract the data that you need

Here is a sample Kotlin code for Android that uses the OpenWeatherMap API to retrieve the current weather data for a city:

import android.os.AsyncTask

import androidx.appcompat.app.AppCompatActivity

import android.os.Bundle

import android.widget.TextView

import org.json.JSONObject

import java.net.URL

import java.text.SimpleDateFormat

import java.util.*

class MainActivity : AppCompatActivity() {

val CITY: String = "London"

val API: String = "YOUR_API_KEY"

val URL: String = "https://api.openweathermap.org/data/2.5/weather?q=$CITY&appid=$API&units=metric"

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

setContentView(R.layout.activity_main)

weatherTask().execute()

}

inner class weatherTask() : AsyncTask<String, Void, String>() {

override fun doInBackground(vararg params: String?): String? {

var response:String?

try {

response = URL(URL).readText(Charsets.UTF_8)

} catch (e: Exception) {

response = null

}

return response

}

override fun onPostExecute(result: String?) {

super.onPostExecute(result)

try {

val jsonObj = JSONObject(result)

val main = jsonObj.getJSONObject("main")

val sys = jsonObj.getJSONObject("sys")

val wind = jsonObj.getJSONObject("wind")

val weather = jsonObj.getJSONArray("weather").getJSONObject(0)

val updatedAt:Long = jsonObj.getLong("dt")

val updatedAtText = "Updated at: "+ SimpleDateFormat("dd/MM/yyyy hh:mm a", Locale.ENGLISH).format(Date(updatedAt*1000))

val temperature = main.getString("temp")+"°C"

val weatherDescription = weather.getString("description")

val sunrise:Long = sys.getLong("sunrise")

val sunset:Long = sys.getLong("sunset")

val windSpeed = wind.getString("speed")+" m/s"

val pressure = main.getString("pressure")+" hPa"

val humidity = main.getString("humidity")+"%"

findViewById<TextView>(R.id.updated_at).text = updatedAtText

findViewById<TextView>(R.id.temperature).text = temperature

findViewById<TextView>(R.id.weather_description).text = weatherDescription.capitalize()

findViewById<TextView>(R.id.sunrise).text = SimpleDateFormat("hh:mm a", Locale.ENGLISH).format(Date(sunrise*1000))

findViewById<TextView>(R.id.sunset).text = SimpleDateFormat("hh:mm a", Locale.ENGLISH).format(Date(sunset*1000))

findViewById<TextView>(R.id.wind).text = windSpeed

findViewById<TextView>(R.id.pressure).text = pressure

findViewById<TextView>(R.id.humidity).text = humidity

} catch (e: Exception) {

findViewById<TextView>(R.id.error_text).text = "Error: ${e.message}"

}

In this code, we first define the city name and API key as constants.

We then define the API URL by appending the city name and API key as parameters to the base URL.

We then create an AsyncTask subclass called weatherTask that retrieves the weather data from the API in the background and updates the UI with the retrieved data.

In the doInBackground method, we use the URL.readText() function to retrieve the JSON response from the API.

In the onPostExecute method, we parse the JSON response and extract the necessary weather data.

We then update the UI with the extracted data using the findViewById function to get references to the UI elements and the setText function to set their text values.

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