Application Framework

Sitting above the native libraries and runtime, you'll find the Application Framework layer. This layer provides the high-level building blocks you will use to create your applications. The framework comes pre-installed with Android, but you can also extend it with your own components as needed.

The most important parts of the framework are as follows:

• Activity Manager: This controls the life cycle of applications (see Section 2.2, It's Alive!, on page 35) and maintains a common "backstack" for user navigation.

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