Here, we will put into practice everything we have learned so far and finish coding the Age database app. Before our Fragment classes from the previous section can interact with a shared database, we need a class to handle interaction with, and creation of, the database.
We will create a class that manages our database by implementing SQLiteOpenHelper. It will also define some String variables in a companion object to represent the names of the table and its columns. Furthermore, it will supply a bunch of helper functions we can call to perform all the necessary queries. Where necessary, these helper functions will return a Cursor object that we can use to show the data we have retrieved. It would be trivial then to add new helper functions should our app need to evolve:
Create a new class called DataManager and add the companion object, the constructor, and the init block:
Note
We discussed the companion object in Chapter 25, Advanced UI with Paging and Swiping
class...
