Weather App

This is an Android app that retrieves weather information from the OpenWeatherMap API. The app demonstrates concepts of MVVM, RxJava, and Kotlin.

Screenshots

External Dependencies

This app uses the following external dependencies:

• com.google.android.material:material:1.6.1: Material Design components for Android.
• androidx.core:core-ktx:1.7.0: Kotlin extensions for the Android platform.
• androidx.appcompat:appcompat:1.5.0: Android support library for backwards compatibility.
• androidx.constraintlayout:constraintlayout:2.1.4: Layout manager for Android that helps create complex layouts.
• com.google.code.gson:gson:2.9.0: Java library that can be used to convert Java Objects into their JSON representation.
• com.squareup.retrofit2:retrofit:2.9.0: A type-safe HTTP client for Android and Java.
• com.squareup.retrofit2:converter-gson:2.9.0: Converter for Retrofit that uses Gson to convert JSON responses to Java objects.
• com.squareup.retrofit2:adapter-rxjava2:2.9.0: Adapter for Retrofit that allows it to use RxJava 2 for asynchronous requests.
• io.reactivex.rxjava2:rxjava:2.2.21: Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java Virtual Machine (JVM).
• io.reactivex.rxjava2:rxandroid:2.1.1: Reactive Extensions for Android – a library for composing asynchronous and event-based programs using observable sequences for Android.
• com.afollestad.material-dialogs:datetime:3.3.0: A library that provides a simple way to display a date/time picker in Android.

ViewModel

This app uses a MainViewModel to handle the data for the main activity. The MainViewModel subscribes to the WeatherAPIService to get weather data from the OpenWeatherMap API using RxJava for asynchronous requests. The MainViewModel has three MutableLiveData fields:

• weatherData: contains the weather data received from the API
• weatherError: contains a Boolean indicating whether there was an error retrieving the weather data
• weatherLoading: contains a Boolean indicating whether the app is currently loading weather data

Service

The WeatherAPIService is responsible for making requests to the OpenWeatherMap API using Retrofit. The getDataService() function takes in the latitude and longitude of the location to get the weather data for, and returns a Single object that emits the weather data when it is received from the API.

License

This project is licensed under the MIT License.