Android Operating System: Architecture, Security Challenges and Solutions

 

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Android Architecture 
 
Figure 1 outlines the current (layered) Android Architecture. The modified Linux kernel operates as the 
HAL, and provides device driver, memory management, process management, as well as networking 
functionalities, respectively. The library layer is interfaced through Java (which deviates from the 
traditional Linux design). It is in this layer that the Android specific libc (Bionic) is located. The surface 
manager handles the user interface (UI) windows. The Android runtime layer holds the Dalvik Virtual 
Machine (DVM) and the core libraries (such as Java or IO). Most of the functionalities available in 
Android are provided via the core libraries. 
Figure 1 :- Android system architecture. Green items are written in C/C++, blue 
items are written in Java and run in the Dalvik VM. Image taken from [06, What is 
Android?]. 

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Application layer: 
It is the most upper layer in android architecture. All the applications like camera, 
Google maps, browser, sms, calendars, contacts are native applications. These applications works with 
end user with the help of application framework to operate. 
Application framework: 
Android 
applications which are developing, this layer contain needed classes and services. Developers can reuse 
and extend the components already present in API. In this layer, there are managers which enable the 
application for accessing data. These are as follows: [5] 
Activity manager: 
It manages the lifecycle of 
applications. It enables proper management of all the activities. All the activities are controlled by 
activity manager. 
Resource manager: 
It provides access to non-code resources such as graphics etc.