☄️Asteroid Radar App

Asteroid Radar is an app to view the asteroids detected by NASA that pass near Earth, you can view all the detected asteroids in a period of time, their data (Size, velocity, distance to Earth) and if they are potentially hazardous.

The app consists of two screens: A Main screen with a list of all the detected asteroids and a Details screen that displays the data of that asteroid once it´s selected in the Main screen list. The main screen also shows the NASA image of the day to make the app more striking.

The application:

• Includes the Main screen with a list of clickable asteroids
• Includes a Details screen that displays the selected asteroid data once it’s clicked in the Main screen
• Downloads and parses data from the NASA NeoWS (Near Earth Object Web Service) API.
• Once an asteroid is saved in the database, the list of asteroids is displayed
• The asteroids data is cached by using a worker, so it downloads and saves week asteroids in background when device is charging and wifi is enabled, as well as deleted the asteroids data of the previous day
• App works in multiple screen sizes and orientations, also it provides talk back and push button navigation.

Instructions for using API

To build this project the NASA NeoWS (Near Earth Object Web Service) API is used, which can be found here: https://api.nasa.gov/

In order to run the app, you need an API Key which is provided for you in that same link, just fill the fields in the form and click Signup.

Dependencies

The most important dependencies used are:

• Retrofit to download the data from the Internet.
• Moshi to convert the JSON data we are downloading to usable data in form of custom classes.
• Picasso to download and cache images.
• RecyclerView to display the asteroids in a list.

The following components from the Jetpack library are used:

• ViewModel
• Room
• LiveData
• Data Binding
• Navigation

Built With

• Android Studio - Default IDE used to build android apps
• Kotlin - Default language used to build this project
• Navigation Component - Android Jetpack's Navigation component, used for Fragment-based navigation
• Retrofit - a type-safe HTTP client for Android and Java
• Moshi - a modern JSON library for Android and Java, that makes it easy to parse JSON into Java or Kotlin objects
• Picasso - a powerful image downloading and caching library for Android
• Android Architecture Components - a collection of libraries that help design robust, testable, and maintainable apps: Room (a SQLite object mapping library), LiveData (builds data objects that notify views when the underlying database changes), ViewModel (stores UI-related data that isn't destroyed on app rotations)
• Data Binding - a Jetpack support library that allows to bind UI components in your layouts to data sources in your app using a declarative format rather than programmatically
• MVVM - the architecture pattern used in the app (Model-View-ViewModel), that incorporates the Android Architecture Components

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Screen 3	Screen 4