Deck 6: Jam Implementing Audio in Android Apps

Question 1

The end of an Activity is marked by the invocation of the ____ method.

A) atEnd
B) onClose
C) onDestroy
D) onEnd

Answer 1

C

Question 2

The delay used when scheduling a timer is measured in ____.

A) milliseconds
B) minutes
C) picoseconds
D) seconds

Answer 2

A

Question 3

Android music apps are not capable of playing music from a memory card.

Answer 3

False

Question 4

There are four states an Activity can be in.

Question 5

A(n) ____ invokes a scheduled Timer.

A) AbstractTask
B) ScheduledTask
C) Task
D) TimerTask

Question 6

It is important not to use excessively long timers that may waste the user's time or cause delays.

Question 7

A(n) ____ in Java executes a one-time task.

A) alarm
B) cron
C) ticker
D) timer

Question 8

The TextView property for backgrounds is ____.

A) application
B) background
C) bkgrd
D) image

Question 9

Every Activity has a(n) ____, which is the series of actions from the beginning of an Activity to its end.

A) life cycle
B) log
C) script
D) story

Question 10

Music can be used in many ways throughout mobile apps; therefore, it is important to become familiar with the various means of interacting with music media.

Question 11

Consumers often buy a phone with more memory to increase the number of songs they can store.

Question 12

On an Android, 1000 milliseconds to roughly equivalent to ____ second(s).

A) 0.1
B) 1
C) 10
D) 100

Question 13

Most people today do not use their mobile device to play music.

Question 14

An app may be terminated if other apps or operations (such as a phone call) require resources.

Question 15

The splash screen provides time for the Android to ____.

A) bootstrap the phone driver
B) download updates
C) initialize resources for your app
D) stream data from Google

Question 16

When buying a phone, one major consideration should be ____.

A) memory
B) number of speakers
C) screen size
D) text plan

Question 17

Java only allows one thread of execution at a time.

Question 18

It's not necessary to understand the life cycle of an app in order to code it.

Question 19

Timers can be used to display updates of how long an installation is taking by displaying a countdown, monitor what a user is doing, or execute other routines while an Activity is running.

Question 20

The XML file that stores the splash screen information is called ____.

A) bootstrap.xml
B) intro.xml
C) splash.xml
D) start.xml

Question 21

The method that hides an Activity is ____.

A) onDestroy
B) onResume
C) onStart
D) onStop

Question 22

There are ____ common states of the music player.

A) two
B) three
C) four
D) six

Question 23

The most common file type of media supported for audio playback on the Android is ____.

A) midi
B) mp3
C) ogg
D) wav

Question 24

The recommended way to obtain a MediaPlayer instance is to use ____.

A) an instance from the Activity class
B) the new keyword
C) the static global one created by the Android API
D) the static method create

Question 25

The Timer and TimerTask classes are in the ____________________ package.

Question 26

The ____ method will temporarily stop music while it is playing.

A) cease
B) pause
C) start
D) stop

Question 27

The proper constant to use to make a component viewable again is View. ____ .

A) INVISIBLE
B) SHOW
C) VIEWABLE
D) VISIBLE

Question 28

The ____ class comes with the Android platform to play audio and video files.

A) iTunes
B) MediaPlayer
C) Player
D) VideoPlayer

Question 29

The ____ property determines whether a control is displayed or not.

A) display
B) seen
C) viewable
D) visibility

Question 30

The music player may fail to play a given file because ____.

A) the file format is unsupported
B) another file is already playing
C) the parental controls are set
D) the volume is too high

Question 31

A(n) ____________________ is a single sequential flow of control within a program.

Question 32

To schedule a TimerTask task for three seconds, the correct code is ___________________________________.

Question 33

In a camera app, the next step in the life cycle after tapping the button to take a picture is to call ____.

A) onPause() to let the user do something else
B) onRestart() to restart the rest of the app
C) onResume() to reactivate the camera
D) onStop() to hide the live image

Question 34

The signature of the method that must be implemented in a new TimerTask is ____________________.

Question 35

A ____ variable ceases to exist when execution of its declaring method completes.

A) constant
B) global
C) local
D) static

Question 36

A variable that is visible in multiple methods of a class is called a(n) ____ variable.

A) abstract
B) class
C) global
D) overhead

Question 37

The ____ of an Activity determine whether the Activity is active, paused, stopped, or dead.

A) labels
B) names
C) states
D) tags

Question 38

The ____________________ method releases resources and frees up memory connected to an Activity.

Question 39

Each of the following is a common state for the MediaPlayer class except ____.

A) continue()
B) pause()
C) start()
D) stop()

Question 40

The MediaPlayer class cannot ____.

A) play different music formats
B) play music files
C) report its current state
D) stop playing music

Question 41

The method to modify the visibility property of a control is ____________________.

Question 42

The ____________________ of a variable refers to the variable's visibility within a class.

Question 43

____________________ variables cease to exist when their class or activity is unloaded.

Question 44

A(n) ____________________ is a piece of technology that is used to compress and decompress audio and video files.

Question 45

When storing audio and video files in an application's resources for playing, the correct folder to use is ____________________.

Question 46

Typically, the ____________________ method, which is inside the onDestroy method, is called directly before another Activity is launched.

Question 47

The MediaPlayer class is in the ____________________ package.

Question 48

The code to reference a music file called "balloonPop" in the raw directory is ____________________.

Question 49

The Android provides the ____________________ class to record audio and video.

Question 50

The correct method to use to play music with the MediaPlayer class is ____________________.