Android framework

If someone asks me the below questions W开发者_如何学Gohat an Android Framework is? What does it do?

How should I answer?

Also what is the role of API's such as Activity Manager, Location Manager etc in the Framework?

What an Android Framework is? What does it do?

Application framework enabling reuse and replacement of components

What is the role of API's such as ActivityManager?

ActivityManager for interacting with the global activity state of the system.

What is the role of API's such as LocationManager?

LocationManager class provides access to the system location services.

** Keep the answers simple, as if you go in details you will face much harder questions, as you give the opportunity to be asked more into the core.

What an Android Framework is?

A: It is usually called as 'Android system server'.
There are many encapsulated libraries, such as 'xxxManager.class'.

What does it do?

A: Actually does something core functions.

What is the role of API's such as ActivityManager?

A: It is just wrapped manager to use Activity easily.

What is the role of API's such as LocationManager?

A: It also wrapped manager to use something related GPS.

More information briefly

A: If you cutomize Anroid framwork, you should understand about AIDL(Android Interface Definition Language).
AIDL is a middle transport between Android Application and Android System Server.