Iat 381 Quiz 1

Front 1

what were 3 types of early mobile information platforms?

Back 1

- piece of stone/clay with markings on it

- papyrus scroll and ink pen

- 1800s: printed book

Front 2

what was "The Brick" and when did it come out?

Back 2

1983

Motorola DynaTAC 8000X - first commercially available cell phone

2.5lbs

30 mins battery power

expensive, around 4000 dollars

Front 3

what was the first Personal Digital Assistant (PDA)? when did it come out?

Back 3

Apple Newton, 1987

set vision leading to today's mobile platform, not very commercially successful

Front 4

what vision did Apple Newton set? which concept persisted and which faded?

Back 4

- tablet concept with a stylus for handwriting

- pen faded away

- tablet persisted

Front 5

what were the Marco and Envoy? when was it created?

Back 5

Motorola wireless device, 1995

Front 6

why were the early PDA devices not very successful?

Back 6

FORM FACTOR!!

- they were large devices

Front 7

what OS did Palm Pilot use?

Back 7

- Palm OS acquired by US

**continue

Front 8

what 2 concepts did the Nokia Communicator (1996) bring together?

Back 8

- PDAs

- digital cellular telephony

Front 9

what 3 features did the Nokia Communicator have? when did it come to an end?

Back 9

- combined PDA features with networked applications (telnet, phone, fax)

- clamshell design

- qwerty keyboard

came to an end in 2007

Front 10

what were 4 initial innovations of early mobile computing devices?

Back 10

- low-power mobile processors

- higher quality displays

- low-powered meter accuracy GPS technology

- embedded sensors

(e.g. proximity and acceleration sensors, digital compass)

Front 11

what 3 native platforms do we have today?

Back 11

- apple iOS

- google android

- microsoft windows

Front 12

what is android?

Back 12

mobile operating system + app framework

Front 13

what 3 things does google do for android?

Back 13

– Develops and extends the Android OS

– Distributes the Android OS and developer tools

– Runs Google Play (Android app market)

Front 14

what are the 2 things that android architecture is composed of?

Back 14

operating system

- based on linux

- designed to run on mobile devices

complete application framework

- allows us to create and deploy our own custom apps

Front 15

what are the 4 application components?

Back 15

- activities

- services

- broadcast receivers

- content providers

Front 16

what is the activities application component?

Back 16

screens made up of views

multiple views arranged into layouts

Front 17

what does the services application component do?

Back 17

perform a background job

usually dont have visual component

e.g. if you continuously need to fetch current weather info from a web service

Front 18

what does the broadcast receivers application component do?

Back 18

react to system messages

react to messages from other apps

e.g. you're using hardware in your app, and in your app you want to be notified if battery goes low -> it can get system messages and you can adjust your code

Front 19

what does the content providers application component do?

Back 19

managed access to data

apps exchange data with each other

e.g. database and you want to share the database with other apps in android device

Front 20

what are two things you have with an activity?

Back 20

- behaviour (coded in Java)

- layout (appearance) (coded in XML)

Front 21

what is the bottom of the android architecture?

Back 21

linux kernel -> relationship of software to hardware

only need to know if you're manufacturing android

Front 22

what's second layer of android architecture?

Back 22

library

-> power that android comes from

- database

android runtime

Front 23

what's second to top layer of android architecture? this is the one we'll be working with the most

Back 23

application framework -> all the managers

e.g. activity managers, takes care of all the activities (takes care of life cycle)

Front 24

what's the top layer of android architecture?

Back 24

applications that we write, install, or are already on it

e.g. home, contacts, phone, browser

Front 25

each app has ___ main activity

where is it specified?

Back 25

one

in the manifest

Front 26

what is the activity stack? what's it arranged by? what's most recent activity?

Back 26

stack of activities

arranged by most recent activity

- the one user is interacting with

Front 27

what happens if you press "back" or destroy the first activity on the activity stack?

Back 27

it goes to activity 2

Front 28

what happens if the activities on the activity stack use too many resources?

Back 28

the oldest activity will be destroyed if the above activities use too many resources (battery, memory)

Front 29

what special methods help us know if our activity is visible or paused or stopped?

Back 29

lifecycle methods

Front 30

what is explicit intent? what is implicit intent?

Back 30

implicit

- start activities that are external to the app

explicit

- start activities that are within the app

Front 31

what are activity lifecycle methods? how are they triggered?

Back 31

methods that are triggered by the system as a result of other things happen

WE DONT CALL IT OURSELVES

Front 32

how can the activity lifecycle help us? 4 ways

Back 32

fine-tune behaviour of our activity

- don't lose user's progress

- don't lose user's data

- don't use heavy processing/network operations when user is away from app

- app shouldn't crash when another app is started

Front 33

in what type of storage do lifecycle methods save data temporarily?

Back 33

non-persistent storage

Front 34

what are some activity lifecycle methods? what happens when user launches app for first time?

Back 34

onCreate()

onStart()

onResume()

e.g. when user launches an app for the FIRST time (it's new) and it calls the above methods in quick succession

Front 35

what happens when user moves from activity to another activity? what methods are called?

Back 35

current activity goes into the back stack

onPause()

onStop()

called in quick succession

Front 36

when you work with hardware, what are the 2 rules?

Back 36

acquire late

release early

to SAVE resources

e.g. if you're using sensor, we want to acquire it at onResume() and release it on onPause()

Front 37

what happens if the app is on the backstack and the system decide it has to kill the activity, what happens?

Back 37

onDestroy()

Front 38

what's 2 other situations when onDestroy() gets called

Back 38

- finish() the activity through code

- on activity, presses back button, destroys current activity

-> onPause, onStop, onDestroy

Front 39

what's one case in the activity lifecycle when onStop doesn't directly follow onPause?

Back 39

if the current activity isn't fully covered e.g. dialog

when dialog closed and old activity shown, onResume() will be called right away

Front 40

what does logging use? 2 things

Back 40

memory and CPU resources

Front 41

what happens in the lifecycle if you rotate the device?

Back 41

full cycle -> pause, stop, destroy and start fresh create, start, resume

Front 42

what is an example of the activity state?

Back 42

if you have a text entry input, when your device orientation changes, you want to save the user's text input

Front 43

when is onSaveInstanceState() called? are they part of lifecycle? is it a callback method?

Back 43

called each time the activity is paused, so after onPause

not part of life cycle but always called in lifecycle

it's a callback method

Front 44

after what, is onRestoreInstanceState() called?

Back 44

after onStart

Front 45

what is an EXCEPTION to onSave and onRestore being called?

Back 45

back button destroys the activity, so you can't restore the information

Front 46

what is the bundle parameter of onSave and onRestore?

Back 46

the bundle where you're going to save your info

it's a map: key -> value

Front 47

what is the context class?

Back 47

interface to global information about an application environment

Front 48

what are some example of resources? what can you find in the res folder?

Back 48

- Strings, colors, and dimensions

– Drawable graphics files

– Layout files

– Raw files of all types

Front 49

what do you store in preferences?

Back 49

persistent storage, you can store values

Front 50

what's the diff between app resources and system resources?

Back 50

app resources - defined by developer within android project files and are specific to app

system resources - common resources defined by android platform and accessible to all applications through android SDK

(e.g. list view)

Front 51

what is R.java? what can you access in it?

Back 51

it's a classfile where you can access application resources programmatically

Front 52

what are 3 different examples of android hardware?

Back 52

smartwatches, TV programming, in-car systems

Front 53

what is android's operating system based on, and what is it specifically designed to run on?

Back 53

based on linux

designed to run on mobile devices

Front 54

what does android's complete application framework allow us to do?

Back 54

create and deploy our own custom apps

Front 55

what is the linux kernel? what are drivers?

Back 55

it's linux itself and a set of drivers

each driver interfaces with some aspect of the Android device

e.g. audio, camera, display, keyboard, wi-fi

Front 56

what is the libraries + android runtime layer?

Back 56

libraries

- set of core libraries

- e.g. graphics, database

runtime

- a sort of virtual machine

Front 57

what is the application framework? what are some examples of modules?

Back 57

modules for controlling the different components of an app

- activity manager

- location manager

- notification manager

- content providers (manage data, move data between apps)

Front 58

what is one pro and two cons of using the android studio emulator?

Back 58

pro

- test apps on various hardware and screen sizes

cons

- missing sensors

- missing GPS, camera, recording

Front 59

in regards to lifecycle methods, what methods get called if the back button is pressed and the new activity loads?

Back 59

onRestart()

onStart()

onResume()

IF app is already existent

Front 60

which 3 lifecycle methods have a bundle parameter?

Back 60

onCreate()

onSaveInstanceState()

onRestoreInstanceState()

Front 61

in onSaveInstanceState(), what is the line to save a variable?

Back 61

bundle.putInt("key", value);

Front 62

in onRestoreInstanceState(), what is the line to retrieve a variable?

Back 62

bundle.getInt("key");

Front 63

what 4 things can the application context do?

Back 63

- Work with app permissions

- Access app preferences

- Retrieve app resources: strings, graphics, XML files

- Manage private app files and directories

Front 64

what methods to call when accessing...

context

preferences

resources

Back 64

getApplicationContext()

getSharedPreferences()

getResources()

Front 65

what two things can you save in preferences?

Back 65

- configuration settings

- persistent application state information

Front 66

what is a resource identifier? what does it do?

Back 66

unique number associated with the resource, generated with the R.java class

retrieves a resource

Front 67

what class is the fundamental building block of android apps, and the central location for all top-level app functionality?

Back 67

context class

Front 68

what is the android device monitor?

Back 68

tool that shows all application debugging and analysis tools

Front 69

why do we need to know about the activity lifecycle?

Back 69

fine tunes behaviour of our activity/app