The application framework is the layer responsible for handling the basic functioning of a phone, such as resource management, handling calls, and so on. This is the block through which the applications installed on the device directly talk to it. The following are some of the important blocks in the application framework layer:

• Telephony Manager: This block manages all the voice calls.
• Content Provider: This block manages the sharing of data between different applications.
• Resource Manager: This block manages various resources used in applications.

The final layer is the system apps layer, which will be discussed next.