Most apps will need one or more screens that they will use to communicate with the user. It is possible to write applications that don’t need a UI (e.g., apps that run in the background), but for the most part, when you create an application it will need a user interface, and for this reason, we need to understand activities. Building user interfaces is one of the fundamental skills that an Android programmer must have. In this chapter, we will take a look at how to build an app with a single and simple user interface. You have already created such an app back in Chapter ...
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