This sample app is based on Android new Architecture Components Like Room, ViewModel and LiveData .

It Simply stores words into SQLite using Room layer.

Room is a database layer on top of an SQLite database. Room takes care of mundane tasks that you used to handle with a database helper class such as SQLiteOpenHelper.

* Room uses the DAO to issue queries to its database.

* By default, to avoid poor UI performance, Room doesn't allow you to issue database queries on the main thread. LiveData applies this rule by automatically running the query asynchronously on a background thread, when needed.

* Room provides compile-time checks of SQLite statements.

* Your Room class must be abstract and extend RoomDatabase.

* Usually, you only need one instance of the Room database for the whole app.

LiveData, which is a lifecycle library class for data observation, can help your app respond to data changes. If you use a return value of type LiveData in your method description, Room generates all necessary code to update the LiveData when the database is updated.

A ViewModel holds your app's UI data in a way that survives configuration changes. Separating your app's UI data from your Activity and Fragment classes lets you better follow the single responsibility principle: Your activities and fragments are responsible for drawing data to the screen, while your ViewModel is responsible for holding and processing all the data needed for the UI.