Android Architecture in details ...

Linux Kernel-

In the linux kernel  we have libraries and android runtime that helps to work with different concepts.
For example SqlLite is a library to store data within the App. We can have media libraries to interact with Videos, Audios and Pictures etc. We also have a very important library called as WEBKIT.

What is WEBKIT in Android?

Webkit is an browser engine powering safari, Google Chrome and Android Internet browser.

Android Runtime-

Android Runtime is a component which takes care of the core services like Google MAP, Location Service and also provides a runtime for running our apps on Google's  Android Operating System.

Android gives every required functions to a App like Memory Management, Device Mangment and other jobs which are the application requisition. Its the runtime's responsibility to interact with whom the App requiring.

The runtime environment actually targets different architectures which exist on different phones. The runtime is able to understand and push the native code according to Architecture of  the phone.

Application framework-

Application framework is a layer through which different applications can interact from various activities with the phone. Every application can interact with defferent kinds of frameworks like notification framework, View framework and telephonic fraework and others.

These frameworks are the basic building blocks for android architecture. These frameworks contains reusable codes, libraries, controls that any application can use for interaction.

Application-

Application layer is the top layer within android architecture.this layer contains two types of application.
1. Inbuilt application
2.User defined Application

1.Inbuilt applications-
Inbuilt apps like Telephony, SMS and browser etc.
They interact with the application framework but they are the integral part of the android system.

2.User Defined Applications- 

 These are the apps which are developed by the end user or the third party developer like Facebook Whatsapp or Twitter etc. They also interact with the application framework and work on the same manner as Inbuilt Applications