Deck 6: Jam Implementing Audio in Android Apps

Question 1

Java allows only one thread of execution at a time.

Answer 1

False

Question 2

You typically use the finish() method right after an activity is launched to clean up resources of the previously running activity.

Answer 2

True

Question 3

On an Android, what is 1000 milliseconds equivalent to in seconds?

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

Answer 3

B

Question 4

A delay timer is scheduled in milliseconds using the Timer class.

Question 5

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

Question 6

The opening screen of an app that displays for a few seconds is called a burst screen.

Question 7

Which feature in Java executes a one-time task?

A) alarm
B) start
C) task
D) timer

Question 8

The four states of an Activity determine whether the activity is running, paused, idle, or terminated.

Question 9

What can be described as the series of actions from the beginning of an Activity to its end?

A) life cycle
B) flow chart
C) run time
D) execution period

Question 10

When you write the code to create a TimerTask , the start() method can be created as an auto-generated method stub.

Question 11

What invokes a scheduled Timer?

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

Question 12

If an Activity is hidden, the onStart() method makes the Activity visible.

Question 13

What is the TextView property for backgrounds?

A) graphic
B) background
C) picture
D) image

Question 14

When buying a phone, what specification should be considered to allow more music to be stored?

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

Question 15

What unit of time is used when scheduling a timer?

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

Question 16

What method marks the end of an Activity?

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

Question 17

Where should you place an image file that will be used as a background image for a TextView control?

A) res\images folder
B) manifests folder
C) res\drawable folder
D) values\backgrounds folder

Question 18

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

Question 19

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

Question 20

What does the splash screen provide time for Android to do?

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

Question 21

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

Question 22

Which method will temporarily stop music while it is playing?

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

Question 23

In a camera app, the next step in the life cycle after tapping the button to take a picture is to call on which method?

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 24

Which of the following methods hides an Activity?

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

Question 25

Each of the following are a common state for the MediaPlayer class except for which one?

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

Question 26

The code to create a timer named splashtime is Timer splashtime = __________________________.

Question 27

To schedule a three second TimerTask named splash for a timer named splashtime , the correct code is ___________________________________.

Question 28

Which of the following classes comes with the Android platform to play audio and video files?

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

Question 29

Which type of variable ceases to exist when execution of its declaring method completes?

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

Question 30

Which property determines whether a control is displayed or not?

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

Question 31

Which of the following actions can the MediaPlayer class NOT do?

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

Question 32

What type of variable is visible in multiple methods throughout the program?

A) scope variable
B) class variable
C) local variable
D) universal variable

Question 33

After entering the TimerTask code, tap or click the red error line under the TimerTask( ) to add the _____________ method, an auto-generated method stub.

Question 34

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

Question 35

Which property of an Activity determines whether the Activity is active, paused, stopped, or dead.

A) label
B) name
C) state
D) tag

Question 36

Which property of a control determines whether the control is displayed on the screen?

A) Display
B) Visibility
C) Active
D) Show

Question 37

What is the most common file type of media supported for audio playback on the Android?

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

Question 38

Why might a music player fail to play a given file?

A) the file format is unsupported
B) another file is already playing
C) the file is stored on the memory card
D) the volume is too high

Question 39

Which is the correct statement to make a button named btnStart visible?

A) btnStart.setVisibility( S how.VIEW );
B) btnStart.setVisibility(Show. VISIBLE);
C) btnStart.setVisibility(View. SHOW);
D) btnStart.setVisibility(View. VISIBLE);

Question 40

Which of the following statements creates a new instance of MediaPlayer and assigns it to mpTrombone?

A) MediaPlayer.new(mpTrombone);
B) mpTrombone = MediaPlayer.create();
C) MediaPlayer.create(mpTrombone);
D) mpTrombone = new MediaPlayer();

Question 41

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

Question 42

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

Question 43

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

Question 44

Finish the code to assign a music file named guitar located in the raw directory to the mpGuitar MediaPlayer instance : mpGuitar = ______________________________.

Question 45

Android provides the ____________________ class to record audio and video.

Question 46

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

Question 47

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

Question 48

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

Question 49

If you want a button to respond to a user's tap or click , you need to call the ____________________  method to implement the button.

Question 50

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