Having covered the Java-based core libraries in the Android runtime, it is now time to turn our attention to the C/C++ based libraries contained in this layer of the Android software stack. A summary of some key core Android libraries available to the Android developer is as follows −Īndroid.app − Provides access to the application model and is the cornerstone of all Android applications.Īntent − Facilitates content access, publishing and messaging between applications and application components.Īndroid.database − Used to access data published by content providers and includes SQLite database management classes.Īndroid.opengl − A Java interface to the OpenGL ES 3D graphics rendering API.Īndroid.os − Provides applications with access to standard operating system services including messages, system services and inter-process communication.Īndroid.text − Used to render and manipulate text on a device display.Īndroid.view − The fundamental building blocks of application user interfaces.Īndroid.widget − A rich collection of pre-built user interface components such as buttons, labels, list views, layout managers, radio buttons etc.Īndroid.webkit − A set of classes intended to allow web-browsing capabilities to be built into applications. Examples of libraries in this category include the application framework libraries in addition to those that facilitate user interface building, graphics drawing and database access. This category encompasses those Java-based libraries that are specific to Android development. On top of Linux kernel there is a set of libraries including open-source Web browser engine WebKit, well known library libc, SQLite database which is a useful repository for storage and sharing of application data, libraries to play and record audio and video, SSL libraries responsible for Internet security etc. Also, the kernel handles all the things that Linux is really good at such as networking and a vast array of device drivers, which take the pain out of interfacing to peripheral hardware. This provides a level of abstraction between the device hardware and it contains all the essential hardware drivers like camera, keypad, display etc. Linux kernelĪt the bottom of the layers is Linux - Linux 3.6 with approximately 115 patches. Android operating system is a stack of software components which is roughly divided into five sections and four main layers as shown below in the architecture diagram.
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