The application framework is a rich environment that provides numerous services to
help you, the app developer, get your job done. This is the best-documented and most
extensively covered part of the platform because it is this layer that empowers developers to get creative and bring fantastic applications to the market.
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In the application framework layer, you will find numerous Java libraries specifically
built for Android. You will also find many services (or managers) that provide the eco-
system of capabilities your application can tap into, such as location, sensors, WiFi,
telephony, and so on.
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 As you explore Android application development, most of your focus will be on this
part of the stack, and you will get to use many of the application framework
components.
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Applications
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And finally, there are the applications that you and other developers create. These
applications are what end users find valuable about Android. They can come pre-in
stalled on the device or can be downloaded from one of the many Android markets.
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