Backing up user data in Note to self

So, with our new-found insight into exceptions, let's modify our Note to self code, and then we can be introduced to JSONObject and JSONException.

First, let's make some minor modifications to our Note class.

Add some more properties that will act as the key in a key-value pair for each aspect of our Note class:

private val JSON_TITLE = "title"
private val JSON_DESCRIPTION = "description"
private val JSON_IDEA = "idea"
private val JSON_TODO = "todo"
private val JSON_IMPORTANT = "important"

Now, add a constructor and an empty default constructor that receives a JSONObject reference and throws a JSONException error. The body of the first constructor initializes each of the members that define the properties of a single Note object by calling the getString or getBoolean function of the JSONObject class, passing in the key as an argument. We also provide an empty constructor, which is required so that we can also create a Note object with uninitialized properties...