Android Architecture

 

·         Android Architecture

Android Architecture

Android Architecture:- In this tutorial we explain about the android architecture and its layer wise description.

Android Application Architecture (Leyer wise describe) :-

      Application framework. The application framework is most used by application developers. As a hardware developer you should be aware of developer APIs as many map directly to the underlying Hardware Abstraction Layer interfaces and can provide helpful information about implementing drivers.

·         Binder IPC. The Binder Inter-Process Communication mechanism allows the application framework to cross process boundaries and call into the Android system services code. This enables high level framework APIs to interact with Android system services. At the application framework level, this communication is hidden from the developer and things appear to "just work".

·         System services. System services are modular, focused components such as Window Manager, Search Service, or Notification Manager. Functionality exposed by application framework APIs communicates with system services to access the underlying hardware. Android includes two groups of services: system and media.

·         Hardware abstraction layer (HAL). A HAL defines a standard interface for hardware vendors to implement, which enables Android to be agnostic about lower-level driver implementations. Using a HAL allows you to implement functionality without affecting or modifying the higher level system. HAL implementations are packaged into modules and loaded by the Android system at the appropriate time. For details, see Hardware Abstraction Layer.

·         Linux kernel. Developing your device drivers is similar to developing a typical Linux device driver. Android uses a version of the Linux kernel with a few special additions such as Low Memory Killer, wake locks the Binder IPC driver, and other features important for a mobile embedded platform. These additions are primarily for system functionality and do not affect driver development. You can use any version of the kernel as long as it supports the required features. However, we recommend using the latest version of the Android kernel. For details, see building Kernels.

      

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