Creating a Weather App with Kotlin

Building a weather app with Kotlin allows you to provide users with up-to-date weather information. In this guide, we'll explore how to develop a simple weather app using Kotlin and a weather API.

Setting Up Your Environment

Before you start, make sure you have the following tools and resources:

  • Kotlin
  • An integrated development environment (IDE) like IntelliJ IDEA
  • Access to a weather API (e.g., OpenWeatherMap, WeatherAPI)
  • Basic knowledge of REST API requests and JSON parsing

Step 1: Get API Access

Sign up for an account or obtain an API key from a weather service provider. This API key is required to make requests and fetch weather data.

Step 2: Create a Kotlin Project

Create a new Kotlin project in your IDE. Ensure that you have internet permissions in your AndroidManifest.xml or the equivalent for your platform.

Step 3: Make API Requests

Use Kotlin to make API requests to the weather service using libraries like Retrofit or Ktor. Here's an example of how to fetch weather data using Ktor:

import io.ktor.client.HttpClient
import io.ktor.client.request.get
import kotlinx.coroutines.runBlocking
fun fetchWeatherData(apiKey: String, city: String): WeatherData {
val client = HttpClient()
val url = "$apiKey&q=$city"
val response = runBlocking { client.get<String>(url) }
val weatherData = parseWeatherData(response)
return weatherData

Step 4: Parse API Responses

Parse the JSON response from the API to extract relevant weather information. Use a JSON parsing library like kotlinx.serialization or Gson. Here's an example:

import kotlinx.serialization.decodeFromString
import kotlinx.serialization.json.Json
fun parseWeatherData(response: String): WeatherData {
return Json.decodeFromString(response)

Step 5: Display Weather Information

Show weather information, such as temperature, humidity, and conditions, in your app's user interface. You can use TextViews, icons, or images to display the data.

Step 6: Handle Errors and Edge Cases

Implement error handling to deal with scenarios where the API request fails or the location is not found. Provide appropriate feedback to the user.

Step 7: Test and Optimize

Test your weather app on different devices and in various weather conditions. Optimize the app's performance and user experience.


Creating a weather app with Kotlin is a practical way to learn about making API requests and parsing JSON data. This guide offers a basic introduction to building a weather app, but you can expand it to include advanced features like forecasting, location-based services, and weather alerts based on your project's requirements.

Happy developing your Kotlin weather app!