In this chapter, we will look at a couple of different ways to save data to an Android device's permanent storage. Also, for the first time, we will add a second Activity
to our app. It often makes sense when implementing a separate "screen," such as a settings screen, in our app to do so in a new Activity
. We could go to the trouble of hiding the original UI and then showing the new UI, but this would quickly lead to confusing and error-prone code. So, we will see how to add an Activity
and navigate the user between them.
In summary, in this chapter, we will do the following:
Learn about Android Intents to switch
Activity
and pass dataCreate a simple (very simple) settings screen in a new
Activity
Persist the settings screen data using the
SharedPreferences
classLearn about JavaScript Object Notation (JSON) for serialization
Explore Java's
try
-catch
-finally
Implement saving data in our Note to Self app