•android.app
–Provides access to the application model and is the cornerstone of all Android applications.
•android.content
–Facilitates content access, publishing and messaging between applications and application components.
•android.database
–Used to access data published by content providers and includes SQLite database management classes.
•android.graphics
–A low-level 2D graphics drawing API including colors, points, filters, rectangles and canvases.
•android.hardware
–Presents an API providing access to hardware such as the accelerometer and light sensor.
•android.opengl
–A Java interface to the OpenGL ES 3D graphics rendering API.
•android.opengl
–A Java interface to the OpenGL ES 3D graphics rendering API.
•android.os
–Provides applications with access to standard operating system services including messages, system services and inter-process communication.
•android.media
–Provides classes to enable playback of audio and video.
•android.net
–A set of APIs providing access to the network stack. Includes android.net.wifi, which provides access to the device’s wireless stack.
•android.provider
–A set of convenience classes that provide access to standard Android content provider databases such as those maintained by the calendar and contact applications.
•android.text
–Used to render and manipulate text on a device display.
•android.util
–A set of utility classes for performing tasks such as string and number conversion, XML handling and date and time manipulation.
•android.view
–The fundamental building blocks of application user interfaces.
•android.widget
-A rich collection of pre-built user interface components such as buttons, labels, list views, layout managers, radio buttons etc.
•android.webkit
–A set of classes intended to allow web-browsing capabilities to be built into applications
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