Android Application Frame work
Developers have full access to the same framework APIs used by the core applications. The application architecture is designed to simplify the reuse of components; any application can publish its capabilities and any other application may then make use of those capabilities (subject to security constraints enforced by the framework). This same mechanism allows components to be replaced by the user.
Underlying all applications is a set of services and systems, including:
1)A rich and extensible set of Views that can be used to build an application, including lists, grids, text boxes, buttons, and even an embeddable web browser
2)Content Providers that enable applications to access data from other applications (such as Contacts), or to share their own data
3)A Resource Manager, providing access to non-code resources such as localized strings, graphics, and layout files
4)A Notification Manager that enables all applications to display custom alerts in the status bar
5)An Activity Manager that manages the lifecycle of applications and provides a common navigation backstack
For a full application break through go through the notepad tutorial here(click here)
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