DCA3201 MOBILE APPLICATION DEVELOPMENT

Description

SESSION	JULY/SEP 2025
PROGRAM	BACHELOR OF COMPUTER APPLICATIONS (BCA)
SEMESTER	VI
COURSE CODE & NAME	DCA3201 MOBILE APPLICATION DEVELOPMENT

 

 

Set-I

 

Q1. Draw the android architecture diagram with functions of each layer. 5+5

Ans 1.

Android Architecture

Android architecture is a structured software framework that defines how different system components interact to provide a reliable and efficient mobile operating system. It is designed on a layered model, where each layer depends on the services of the one beneath it. The architecture provides the foundation for developing and running Android applications smoothly across a wide range of hardware devices. It consists of five major layers — Linux Kernel, Libraries, Android Runtime, Application Framework, and Applications. Each layer contributes distinct functions that ensure performance, security, and modularity.

Linux Kernel

 

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Q2. a) How would you create an empty project in Android Studio. Enlist the major steps.

1. b) Describe about the function of .java and .xml files in an Android project? 5+5

Ans 2.

(a) Creating an Empty Project in Android Studio

To create an empty Android project, begin by launching Android Studio and selecting New Project from the welcome screen (or File → New → New Project if a window is already open). Choose Empty Activity (or No Activity if you truly want a bare project skeleton) to get a minimal template. Provide the Application name, confirm or edit the Package name, and choose a Save location. Select the Language (Kotlin is the modern default, Java remains supported) and set the Minimum SDK to define

 

Q3. Describe Dalvik Virtual Machine and Android Run Time (ART). 5+5      

Ans 3.

Dalvik Virtual Machine (DVM)

The Dalvik Virtual Machine (DVM) was the original process virtual machine used by Android to run applications written in Java. It was specifically designed for mobile devices that have limited memory, slower CPUs, and lower battery capacity. Unlike the traditional Java Virtual Machine (JVM), which is stack-based, Dalvik is register-based, enabling it to execute instructions using fewer CPU cycles and thus consume less power. Applications written in Java are first compiled into standard .class files and then converted into Dalvik Executable (DEX) files through the Android build system. These .dex files are optimized for small size and shared memory usage, allowing multiple applications to run efficiently on a single device.

Dalvik’s process model

 

Set-II

 

Q4. Explain the role of LoaderManager. LoaderCallbacks in managing Cursor Loaders and the significance of its methods in the Android Loader framework 5+5     

Ans 4.

Android Loader Framework

The Android Loader framework was introduced in API Level 11 (Android 3.0) to handle asynchronous data loading efficiently. It is designed to simplify the process of retrieving data from sources such as content providers, databases, or files without blocking the main UI thread. This framework allows developers to manage data loading operations in a lifecycle-aware manner, automatically reconnecting to existing loaders after configuration changes such as screen rotation. The key components of this framework are LoaderManager, Loader, and LoaderCallbacks. These work

 

Q5. Discuss how Broadcast Receivers work in Android and provide an example scenario where they might be useful 5+5      

Ans 5.

Broadcast Receivers

A Broadcast Receiver in Android is a system component that listens for and responds to broadcasted messages, known as intents. These messages are sent either by the Android system or by other applications to notify about specific events. Broadcast Receivers enable applications to respond to these events even when they are not running in the foreground. They are a critical part of Android’s inter-component communication model and are used to trigger short operations or background services in response to changes in system state or custom-defined events.

How Broadcast Receivers Work

Broadcast Receivers can be registered in two ways — statically in the AndroidManifest.xml file or dynamically at runtime using the

 

 

Q6. Discuss the various CRUD operations available in SQLite database. Explain them with the help of suitable example.  5+5

Ans 6.

SQLite in Android

SQLite is a lightweight, open-source, relational database engine integrated into the Android framework. It allows developers to manage structured data efficiently within mobile applications. CRUD stands for Create, Read, Update, and Delete, representing the fundamental operations used to manipulate database records. Android provides the SQLiteOpenHelper class to simplify database creation and management tasks.

Create Operation (Insert Data)

The Create operation is used to