Deck 6: Jam Implementing Audio in Android Apps

Question 1

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

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

Answer 1

A

Question 2

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

Answer 2

False

Question 3

It is still very rare to use a mobile device to play music.

Answer 3

False

Question 4

The splash screen provides time for the Android to ____.

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

Question 5

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

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

Question 6

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

Question 7

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

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

Question 8

Java only allows one thread of execution at a time.

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
C) script
B) log
D) story

Question 10

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

Question 11

A(n) ____ invokes a scheduled Timer.

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

Question 12

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

Question 13

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

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

Question 14

Timers can also 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 15

There are four states an Activity can be in.

Question 16

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

Question 17

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

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

Question 18

When buying a phone, a principal specification usually considered is ____.

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

Question 19

The TextView property for backgrounds is ____.

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

Question 20

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

Question 21

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

Question 22

The MediaPlayer class cannot ____.

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

Question 23

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

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

Question 24

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

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

Question 25

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

Question 26

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

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

Question 27

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

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

Question 28

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

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

Question 29

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

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

Question 30

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

Question 31

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 32

There are ____ common states of the music player.

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

Question 33

The method that hides an Activity is ____.

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

Question 34

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

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

Question 35

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

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

Question 36

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

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

Question 37

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

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

Question 38

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

Question 39

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 40

The Timer and TimerTask classes are in the ____________________ package.

Question 41

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

Question 42

The MediaPlayer class is in the ____________________ package.

Question 43

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

Question 44

If you want to store audio and video files in the application's resources for playing, the correct folder to use is ____________________.

Question 45

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

Question 46

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

Question 47

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

Question 48

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

Question 49

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

Question 50

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