Functionality exposed by application framework APIs communicates with system services to access the underlying hardware. There are two groups of services that application developers may interact mostly with. They are system (services such as window manager and notification manager) and media (services involved in playing and recording media). These are the services that provide application interfaces as part of the Android framework.
Besides these services, there are also native services supporting these system services, such as SurfaceFlinger, netd, logcatd, rild, and so on. Many of them are very similar to Linux daemons that you may find in a Linux distribution. In a complicated hardware module, such as graphic, ...
