Mobile Application Development Quiz

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Questions and Answers

What is the purpose of using 'val' in Kotlin?

  • To declare a variable whose value can change
  • To declare a variable whose value can never change (correct)
  • To declare a constant value
  • To declare a nullable variable

How does Kotlin handle type inference?

  • The compiler infers the type based on the context in which the variable is used
  • Kotlin does not support type inference
  • The compiler infers the type based on the initial value assigned to the variable (correct)
  • The programmer must explicitly specify the type for every variable

What is the purpose of the '?' suffix in Kotlin variable declarations?

  • It is used for type inference
  • It indicates that the variable is a nullable type (correct)
  • It is used for declaring constant values
  • It indicates that the variable is a non-nullable type

Which statement about null safety in Kotlin is correct?

<p>Kotlin variables cannot hold null values unless explicitly declared as nullable (A)</p> Signup and view all the answers

What is the purpose of the 'var' keyword in Kotlin?

<p>To declare a variable whose value can change (B)</p> Signup and view all the answers

Which of the following is an invalid Kotlin variable declaration?

<p>var z (D)</p> Signup and view all the answers

What is the purpose of the null safety feature in Kotlin?

<p>To prevent null pointer exceptions at runtime (A)</p> Signup and view all the answers

Which of the following statements about type inference in Kotlin is incorrect?

<p>Type inference is mandatory in Kotlin (A)</p> Signup and view all the answers

What is the purpose of the '?' suffix in Kotlin when used with function parameters?

<p>It indicates that the parameter is a nullable type (B)</p> Signup and view all the answers

Which of the following statements about null safety in Kotlin is incorrect?

<p>Null values can be assigned to non-nullable types (D)</p> Signup and view all the answers

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Study Notes

Course Overview

  • Module Code: IT2010
  • Credit Value: 4
  • Method of Delivery: Lectures (1 hour/week), Tutorials (2 hours/week), and Labs (2 hours/week)
  • Assessment Criteria: Midterm (20%), LAB Exam 1 (10%), LAB Exam 2 (10%), LAB Exam 3 (10%), and Final Exam (50%)

Learning Outcomes

  • Understand the fundamentals of mobile application development
  • Explain different mobile platforms and related technologies
  • Code a simple program in Kotlin

Why Mobile Apps?

  • Mobile phones have various features and opportunities
  • The number of smartphone users is growing (3.5 billion in 2020)
  • Business organizations prefer mobile applications over mobile-friendly websites
  • Good mobile applications add value to businesses

Mobile Application Development

  • Refers to the creation of apps for devices such as tablets, smartphones, and watches
  • Often incorporates features of mobile devices not available on desktop devices

Key Features of Mobile Applications

  • Great UI (User Interface)
  • Fast loading time and high performance
  • Extremely helpful user support
  • Adapts to a user’s needs
  • Compatible with a mobile platform

Reasons for Mobile App Failures

  • Lack of market
  • Inadequate security
  • Slow performance
  • Poor UX/UI
  • Unpersuasive marketplace listing
  • Difficulty adjusting web version to smartphone screen
  • Limited functions

Mobile App Development Platforms

  • Android – Android Studio
  • iOS – Xcode
  • HarmonyOS – DevEco Studio
  • Cross Platform – Flutter, React Native, Xamarin

Android Studio

  • Official integrated development environment (IDE) for Android
  • Built on JetBrains' IntelliJ IDEA software
  • Designed specifically for Android development
  • Replaced Eclipse Android Development Tools (E-ADT) as the primary IDE for native Android application development

Kotlin

  • Modern, concise, and safe programming language
  • Easy to learn and use
  • Preferred language for Android app development
  • Features: Expressive, Concise, Safe, Interoperable, and Structured Concurrency

Kotlin Features

  • Variable Declaration: Use val for immutable variables and var for mutable variables
  • Type Inference: Compiler can infer the type based on the assigned value
  • Null Safety: Variables can't hold null values by default, and nullable types must be specified
  • Conditionals, Functions, Classes, and Asynchronous code

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