04 - Mobile Development

Question 1

Android uses _______ for:
1. Security
2. Memory Management
3. Process Management
4. Network Stack
5. Driver Model

Answer 1

Linux Kernel Drivers

Question 2

interface for the Android framework to communicate with device hardware

Answer 2

Hardware Abstraction Layer

Question 3

libraries that provide core functionalities for various Android components such as graphics, sound, and security

Answer 3

Native C/C++ Libraries

Question 4

takes Java bytecode compiled into Dalvik Executable format and translates it into native machine code that can be directly executed by the device’s processor

Answer 4

Android Runtime

Question 5

Dalvik VM vs ART in terms of:

compilation
performance
storage
battery

Answer 5

Compilation
Dalvik: Just-in-Time
ART: Ahead-of-Time
Performance
Dalvik: Slower performance
ART: Faster performance
Storage
Dalvik: more suitable for limited storage
ART: requires more storage
Battery
Dalvik: uses more battery
ART: improved battery utilization

Question 6

high-level API available to app developers

Answer 6

Java API Framework

Question 7

where your app, that you developed, will reside

Answer 7

application layer

Question 8

iOS uses ___ for :
1. Security
2. Memory Management
3. Process Management
4. Network Stack
5. Driver Model

Answer 8

Core OS

Question 9

abstracts the complexities of the underlying Core OS, making it easier for developers to build applications

Answer 9

Core Services

Question 10

provides the frameworkds and technologies necessary for applications to work with audio, video, graphics, and animations

Answer 10

Media

Question 11

layer that developers use to create the interactive and visually appealing aspects of iOS apps

Answer 11

Cocoa Touch

Question 12

layer that directly interacts with the user

main application layer for iOS

Answer 12

Cocoa Touch

Question 13

function passed as an argument to another function

Answer 13

callback

Question 14

makes the activity visible to the user as the app prepares for the activity to enter the foreground and become interactive

Answer 14

onStart()

Question 15

state in which the app interacts with the user

app stays in this state until something happens to take focus away from the app

Answer 15

onResume()

Question 16

system calls this method as the first indication that the user is leaving your activity

Answer 16

onPause()

Question 17

your activity is no longer visible to the user

Answer 17

onStop()

Question 18

called after onStop() when the current activity is being re displayed to the user

Answer 18

onRestart()

Question 19

called before the activity is destroyed

Answer 19

onDestroy()

Question 20

types of mobile apps (4)

Answer 20

1. Native Apps
2. Hybrid Apps
3. Cross-Platform Apps
4. Progressive Web Apps

Question 21

applications developed for a particular platform or device

Answer 21

native apps

Question 22

apps built using web technologies and wrapped in a native container

Answer 22

hybrid apps

Question 23

relatively easy and quick to develop

can access some device features through plugins

performance can be a concern

Answer 23

hybrid apps

Question 24

closest tier to native development

provides own components

Answer 24

cross-platform apps

Question 25

built using web technologies acts like a native app limited hardware access can bypass app galleries "app-like"

Answer 25

progressive web apps

Question 26

advantages and disadvantages of native apps (3, 2)

Answer 26

adv: - device specific features - works offline - better use of OS and device specific functionalities disadv: - higher development cost - multiple codebaes for the same app

Question 27

advantages and disadvantages of hybrid/cross-platform apps (3, 2)

Answer 27

adv: - reusable code - access to native features - close-to-native UX disadv: - complex apps = slower - apps cannot perform OS specific tasks

Question 28

advantages and disadvantages of PWAs (3 ea)

Answer 28

adv: - reduced development costs - easy updates - versatility disadv: - limited offline functionality - limited access to device features/hardware - security risk