2. What is Android
&
Android Application
Android:
Android is a software stack for mobile devices that includes an operating system,
middleware and key applications.
Android Application:
An Android app is a software application running on the Android platform. Because the
Android platform is built for mobile devices, a typical Android app is designed for a
Smartphone or a tablet PC running on the Android OS.
3. Android Application
Everyone must have heard about Sudoku game. For android I have tried to make that
game. You can play the game in different difficulties. I have added settings for this
game. There any user can choose whether he wants sound and hints or not.
4. Android Operating System
There is four layer in android
Operating System and they are-
Linux Kernel
Libraries and Android Runtime
Application Framework
Applications
5. Sudoku’s Connection with Android Operating
System
Let’s talk about the Libraries that has been used in Sudoku. For Sudoku game I needed a 2D Graphics.
In android libraries there is a 2D graphics provider named SGL. If we need to use 2D graphics we
need to call SGL.
• import android.graphics.Canvas;
• import android.graphics.Paint;
SQLite: As I have to save the game, I need a data storage. SQLite provides the data storage that we
need for the application.
6. DALVIK VIRTUAL MACHINE:
It is extremely low-memory based virtual machine, which was designed especially for Android to run on embedded
systems and work well in low power situations.
I had to check my program before taking it to any phone and see if it is working perfectly. DVM gives us the
support to run our application virtually.
Core Libraries:
The core library contains all of the collection classes, utilities, IO, all the utilities and tools that you’ve come to expected to use.
7. Application Framework
For my Sudoku game I needed to use some features from application framework of android operating system.
View System:
Used to build an application, including lists, grids, text boxes, buttons, and embedded web
browser.
Resource Manager :
Providing access to non-code resources (localized strings, graphics, and layout files).
Activity Manger:
Managing the lifecycle of applications and providing a common navigation back stack.
