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CUSTOMER_CODE
SMUDE
DIVISION_CODE
SMUDE
EVENT_CODE
OCTOBER15
ASSESSMENT_CODE BCA4030_OCTOBER15
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
37829
QUESTION_TEXT
Briefly explain android architecture libraries. Write any eight such native library
and the purpose.
SCHEME OF
EVALUATION
On top of the kernel are the libraries. Android includes a set of C/C++ libraries
written as modules of code that are compiled down to native machine code. It
controls the device to handle different kinds of data efficiently. These libraries
tell the device how to handle different kinds of data and are exposed to Android
developers via Android application framework. It provides some of the common
services that are available for applications and various components of the
Android system. It exposes its capabilities through Android application
framework.
Libraries in Android architecture include the Surface Manager, Media
Framework, WebKit, SQLite, OpenGL/ES, FreeType, SGL, SSL, Libc. These
native libraries run as processes within the underlying Linux kernel. (2 marks)
Libc: Libc is a standard C library tuned for embedded devices.
SSL: It is a Secure Sockets Layer cryptographic protocol for secure internet
communications.
SGL: SGL is a scalable graphic library or also called clear graphic library that
gives the underlined 2D graphic engine. In Android graphics platform,you can
combine 3D and 2D graphics in the same application.
OpenGL/ES: OpenGL/ES is a 3D library. OpenGL supports the CD graphics
which is based on OpenGL1.O, so these libraries either use hardware 3D
accelerator if they are available or they use the highly optimized software. They
have a software implementation that is hardware acceleratable if the device has
a 3D chip on it.
FreeType: Freetype is used for bitmap and vector font rendering. FreeType is
a free, high quality and portable font engine.
WebKit: It is the open source browser engine, used as a core of Android’s
browser.
SQLite: It is the basic datastore technology for the Android platform and is very
lightweight relational database engine that manages access to display
subsystem. It is used as the core of most of its data storage.
Media Frame work: The Media Framework was provided by Packet Video, one
of the members of the open handset alliance and that contains the entire codex
that make up the core of the media experiences.
Surface Manager: The surface manager is responsible for composing different
drawing surfaces on to the screen or you can say that it is responsible for
graphics on the device’s screen.
LibWebCore: LibWebCore is a modern web browser engine that gives us
embeddable web view.
Media Libraries: It supports playback and recording of many popular audio
and video formats, as well as static image file.
Android Runtime
The Android runtime layer also includes set of core java libraries and DVM
(Dalvik Virtual Machine) located in same layer.
Core Libraries: Core Libraries are written in the Java programming
language.The core library contains all of the collection classes, utilities, I/O, all
the utilities and tools that you use.
Dalvik Virtual Machine: Android based systems utilize their own virtual
machine (VM), which is known as the Dalvik Virtual Machine (DVM).
The Bionic Library
Compared to Linux, Androids incorporates its own c library known as Bionic
library.
(Any 8 – each 1 mark)
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
37830
QUESTION_TEXT
With example explain bit manipulation and processor control instructions.
SCHEME OF EVALUATION
Bit manipulation instruction
1.NOT Src
2. AND Des,Src
3. OR Des,Src
4. XOR Des, Src
5. SHL Des, Count
6. SHR Des, Count
7. ROL Des, Count
8. ROR Des, Count
Processor control instruction
1. STC
2. CLC
3. CMC
4. STD
5. CLD
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
72249
QUESTION_TEXT
How does UNIX/Linux OS distinguish and classify devices that are
attached to the computer?
SCHEME OF
EVALUATION
* UNIX/Linux OS distinguishes and classifies devices that are
attached to the computer devices into three fundamental device
types.
[1 marks]
* brief notes on Character devices
[3
marks]
* brief notes on Block devices
[ 3 marks]
* brief notes on Network interfaces.
[3
marks]
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
125399
QUESTION_TEXT
Write down the Advantages and disadvantages of coding in assembly
language.
SCHEME OF
EVALUATION
Advantages of coding in assembly language are:
•
Provides more control over handling particular hardware
components
•
May generate smaller, more compact executable modules
•
Often results in faster execution
Disadvantages:
•
Not portable
•
More complex
•
Requires understanding of hardware details (interfaces)
An assembler does the following:
1. Generate machine instructions
–
evaluate the mnemonics to produce their machine code
–
evaluate the symbols, literals, addresses to produce their equivalent
machine addresses
–
convert the data constants into their machine representations
2.
Process pseudo operations.
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
125402
QUESTION_TEXT
Write short notes on Dalvik virtual machine.
The Dalvik Virtual Machine
SCHEME OF
EVALUATION
You have already read about the Dalvik Virtual machine in unit 12. Let us revise
it again briefly in this section. Android uses its own customized Virtual Machine
(VM) rather than a traditional Java virtual machine (VM) such as Java ME (Java
Mobile Edition) to run Java applications. This VM is known as Dalvik VM and is
a register-based virtual machine that has been optimized to ensure that a
device can run multiple instances efficiently on a single device. The Dalvik VM
uses the underlying Linux kernel of device to handle low-level functionality
along with security, threading, process and memory management.
The DALVIK virtual machine is optimized for low memory compared to other
standard VMs like JVM or Parrot Virtual Machine. The Dalvik virtual machine
uses less space. It uses its own bytes code which is not a java byte code. It
uses storage media as flash memory. All Android hardware and system service
access is managed using Dalvik as a middle tier. VM is used to host application
execution so that developers have an abstraction layer without caring about a
particular hardware implementation. The Dalvik VM executes Dalvik executable
files which is optimized to ensure minimal memory requirement. The .dex
executables are created by transforming Java language compiled classes using
the tools supplied within the SDK.
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
125403
QUESTION_TEXT
What is the data store technology used in Android platform? Explain Android
application framework.
SCHEME OF
EVALUATION
Data Stroe technology: SQLite (1 mark)
1. Activity manager: actually manages life cycles of applications.
2. Window manager: Manages window
3. Content providers: to enable applications access data from other app.
4. View system: Contains things like buttons and lists and all the building
blocks of UI.
5. Notification manager: helps us to display custom alerts on status bar.
6. Package manager: responsible for keeping of what applications you
have and what capabilities each of your applications have.
7. Telephone manager: handler info. About telephony. ABI to build phone
App.
8. Resource manager: gives us access to non-code resources such as
localized strings or various other resources in the form of PIING, BMP
as well as XML.
9.
Location managers: handles info about location.