Monday, September 30, 2013

Android Architecture

Android operating system is a stack of software components which is roughly divided into five sections and four main layers as shown below in the architecture diagram.
Android Architecture

Linux kernel

At the bottom of the layers is Linux - Linux 2.6 with approximately 115 patches. This provides basic system functionality like process management, memory management, device management like camera, keypad, display etc. Also, the kernel handles all the things that Linux is really good at such as networking and a vast array of device drivers, which take the pain out of interfacing to peripheral hardware.


On top of Linux kernel there is a set of libraries including open-source Web browser engine WebKit, well known library libc, SQLite database which is a useful repository for storage and sharing of application data, libraries to play and record audio and video, SSL libraries responsible for Internet security etc.

Android Runtime

This is the third section of the architecture and available on the second layer from the bottom. This section provides a key component called Dalvik Virtual Machine which is a kind of Java Virtual Machine specially designed and optimized for Android.
The Dalvik VM makes use of Linux core features like memory management and multi-threading, which is intrinsic in the Java language. The Dalvik VM enables every Android application to run in its own process, with its own instance of the Dalvik virtual machine.
The Android runtime also provides a set of core libraries which enable Android application developers to write Android applications using standard Java programming language.

Application Framework

The Application Framework layer provides many higher-level services to applications in the form of Java classes. Application developers are allowed to make use of these services in their applications.


You will find all the Android application at the top layer. You will write your application to be installed on this layer only. Examples of such applications are Contacts Books, Browser, Games etc.

Wednesday, September 18, 2013

Will Apple iPhone 5C survive?

Apple says Rs. 35000 is cheap.. but Indian Government says Rs. 20 a day and you are rich..

The iPhone 5c was supposed to be Apple's weapon to take on Android in at least the mid-level smartphone segment, if an entry-level pricing was never going to come to fruition. However, one look at the off-contract pricing for the iPhone 5s in various regions, and all those hopes can be put to rest.

The entry-level 16GB iPhone 5c without a contract has been priced at $549 in the US. That comes out to a whopping Rs. 35,000 at current exchange rates (1 USD = 63.65 INR) and does not include the duties and other charges that come in while pricing a product in India. If you were hoping for a sub-Rs. 25,000 pricing for the iPhone 5c in India, it's safe to say we won't see anything like that.