The factory pattern
The factory pattern is one of the most widely used creational patterns. As its name suggests, it makes things, or more precisely, it creates objects. Its usefulness lies in the way it uses a common interface to separate logic from use. The best way to see how this works is simply to build one now. Open the project we began a page or two previously, or start a new one. Minimum and target SDK levels are not important for this exercise.
Tip
Selecting an API level of 21 or higher allows Android Studio to employ a technology known as hot-swapping. This avoids having to completely rebuild a project each time it is run and vastly speeds up the testing of an app. Even if you intend to finally target a lower platform, the time hot-swapping ...
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