Intentional screen management frees us from the burden of trying each application screen to an individual activity. Using the FragmentTransaction class, we're able to dynamically switch between individual fragments within an activity, eliminating the need to create a separate activity class for each screen in our application. This helps to prevent the proliferation of unnecessary activity classes, better organize our applications, and avoid the associated increase in complexity.
We'll see in the next chapter that this ability to dynamically manage multiple screens within a single activity opens us up to greater flexibility and an increased richness in the appearance and navigation behavior of our Android applications.