AOSP Architecture

The Android Open System Platform (AOSP) is publicly available and modifiable Android source code. Anyone can download and modify AOSP for their device.

https://source.android.com/docs/core/architecture

The Android Open System Platform (AOSP) is publicly available and modifiable Android source code. Anyone can download and modify AOSP for their device. AOSP provides a complete and fully functional implementation of the Android mobile platform.

Note: AOSP can't provide support for apps that require backend services, such as a cloud messaging or advanced location services app. AOSP also doesn't include a full set of end-user apps that might be needed for particular types of devices.

There are two levels of compatibility for devices implementing AOSP: AOSP compatibility and Android compatibility. An AOSP-compatible device must conform to the list of requirements in the Compatibility Definition Document (CDD). An Android-compatible device must conform to the list of requirements in the CDD and Vendor Software Requirements (VSR) and tests such as those in the Vendor Test Suite (VTS) and Compatibility Test Suite (CTS). For further information on Android compatibility, refer to the Android compatibility program.