Roomie (Android Room & Kotlin Sample)

This is an API sample to showcase how to use Room, with Kotlin coroutines.

Introduction

Functionality

This sample app shows a list of words stored using Room database. The user can add new words or delete all in one operation.

Implementation

Data layer

The database is created using Room and has one entity: a Word. Room generates the corresponding SQLite table at runtime.

Queries are executed in the WordDao class. The word retrieval is done via a LiveData object. Every time the user data is updated, the LiveData object will emit automatically, allowing to update the UI based on the latest data.

Presentation layer

The app has a Word Activity that displays the data. The Activity works with a ViewModel to do the following:

• subscribe to the emissions of the words and updates the UI every time there is a new word emitted
• notify the ViewModel when a new word has been added

Third Party Libraries

• Koin Dependency injection framework
• Calligraphy Custom fonts