Summary

In previous chapters, we got quite proficient with a whole array of widgets and other UI elements and we built a fairly good selection of UI layouts. In this chapter and the previous two, we explored Java and the Android Activity lifecycle in quite significant depth, especially considering how quickly we have done it.

What we really need to do now is bring these things together so that we can begin to display and manipulate our data using the Android UI. To achieve this, we need to understand a bit more about classes. They have been lurking in our code since Chapter 1, The First App, and we have even used them a bit. Up until now, however, we haven't tackled them properly other than constantly referring to Chapter 9, Object-Oriented Programming. In the next chapter, we will quickly get to grips with classes and then we can finally start to build apps in which the UI designs and our Java code work in perfect harmony.