Question 1

Pass ________ to an  AudioAttributes.Builder object’s setUsage method to indicate that the audio is being used as game audio. 
A) AudioAttribute.USAGE_GAME
B) AudioAttribute.GAME
C) AudioAttribute.GAME_USAGE
D) None of the above

Accepted Answer

The correct constant to pass to the setUsage method to indicate that the audio is being used as game audio is AudioAttribute.USAGE_GAME. Option B and C are not valid constants.

Question 2

Games, often require complex logic that should be performed in separate threads of execution, and those threads often need to draw to the screen. For such cases, Android provides class ________—a subclass of View that provides a dedicated drawing area in which other threads can display graphics on the screen in a thread-safe manner.
A) GameView 
B) ThreadView
C) ThreadSafeView
D) SurfaceView

Accepted Answer

Android provides SurfaceView which is a subclass of View that provides a dedicated drawing area in which other threads can display graphics on the screen in a thread-safe manner. Therefore, option D - SurfaceView is the correct choice. Options A, B, and C are not valid classes in Android.

Question 3

To process simple touch events in an app, override View method onTouchEvent, then use constants from class ________ (package android.view) to test which type of event occurred and process it accordingly. 
A) Event 
B) MotionEvent
C) Motion
D) View

Accepted Answer

The constants for touch events are found in the MotionEvent class in the android.view package, so the correct answer is B.

Question 4

Class View’s onSizeChanged method is called whenever the View’s size chang-es, including when the View is first added to the View hierarchy as the layout is inflated. The method receives the View’s new width and height and its old width and height. The first time this method is called, the old width and height are ________ and ________. 
A) 0, 0
B) 0, 1
C) 1, 0
D) 1, 1

Accepted Answer

The old width and height will both be 0 when onSizeChanged is called for the first time, as the view has not yet been sized or laid out.

Question 5

When a View is inflated, its constructor is called with a Context and a(n) ________ as arguments.
A) SetOfAttributes
B) Attributes
C) OptionsSet
D) AttributeSet

Accepted Answer

When a View is inflated, its constructor is called with a Context and an AttributeSet as arguments. The AttributeSet is a collection of attributes defined in XML that is used to initialize the View's properties. Therefore, Option A, B, and C are incorrect as they are not related to the AttributeSet.

Question 6

Which of the next three statements is false?
A) Full-screen immersive mode enables an app to take advantage of the entire screen. 
B) When an app is in immersive mode, the user can swipe down from the top of the screen to display the system bars temporarily. 
C) If the user does not interact with the system bars, they disappear after a few seconds.
D) All of the above are true.

Accepted Answer

All the statements provided are true regarding the behavior and functionality of full-screen immersive mode in applications. This mode allows an app to utilize the entire screen space, provides a gesture to temporarily reveal system bars, and hides them again after a period of inactivity.

Question 7

There are seven sound streams identified by AudioManager constants. The mu-sic stream ________ is recommended for sound in games, because this stream’s volume can be controlled via the device’s buttons. 
A) AudioManager.STREAM
B) AudioManager.MUSIC
C) AudioManager.STREAM_MUSIC
D) AudioManager.SYMPHONY

Accepted Answer

The correct answer is C) AudioManager.STREAM_MUSIC. This stream is recommended for sound in games because its volume can be adjusted using the device's hardware volume buttons, allowing for easy and intuitive control by the user.

Question 8

Each SurfaceView subclass should implement the interface ________, which contains methods that are called when the SurfaceView is created, changed (e.g., its size or orientation changes) or destroyed.
A) SurfaceHolder.Callback
B) SurfaceHolderCallback
C) Surface.Callback
D) SurfaceCallback

Accepted Answer

Each SurfaceView subclass should implement the SurfaceHolder.Callback interface, which contains methods that are called when the SurfaceView is created, changed (e.g., its size or orientation changes) or destroyed.

Question 9

All updates to an app's user interface must be performed in the GUI thread of execution, because GUI components are not ________.
A) thread ready
B) thread safe
C) thread capable
D) None of the above

Accepted Answer

GUI components are not thread safe, which means that access to them should be synchronized to avoid concurrency issues. Therefore, all updates to the UI should be performed in the GUI thread of execution to ensure proper synchronization and avoid potential problems.

Question 10

Which of the following statements is false?
A) More complex games might play many sounds at the same time. SoundPool.Builder's setMaxStreams method takes an argument that represents the maximum number of simultaneous sound streams that can play at once.
B) A SparseIntArray maps integer keys to integer values. HashMap<Integer, Integer> is similar to-but more efficient than-a SparseIntArray for small numbers of key-value pairs.
C) Each sound ID can be used to play a sound (and later to return its resources to the system).
D) SoundPool method load receives three arguments-the application's Context, a resource ID representing the sound file to load and the sound's priority.

Accepted Answer

This statement is false. SparseIntArray is actually more memory-efficient than HashMap for small numbers of key-value pairs because it avoids the overhead of boxing and unboxing the keys and values. However, HashMap may perform better for larger numbers of pairs.

Question 11

Which of the next three statements is false?
A) You can add a Fragment and its layout manually.
B) You can design an app for only landscape orientation.
C) To set the screen orientation to landscape, set android:-orientation to landscape.
D) Each of the above is true.

Accepted Answer

The correct way to set the screen orientation to landscape is by setting `android:screenOrientation="landscape"` in the AndroidManifest.xml for the activity, not `android:-orientation`.

Question 12

A Frame-Layout is designed to display one View, but can also be used to ________ views.
A) stack
B) nest
C) position
D) layer

Accepted Answer

The answer of A Frame-Layout is designed to display one...

Question 13

An app’s sound effects are managed with a(n) ________ (package an-droid.media), which can be used to load, play and unload sounds.
A) Effects 
B) SoundPool
C) EffectsPool 
D) SoundManager

Accepted Answer

The correct package for managing sound effects in Android is android.media. Within this package, SoundPool is used to load, play and unload sounds, making it the best choice from the provided options.

Question 14

Canvas's ________ method draws a circle.
A) drawOval
B) drawEllipse
C) drawCircle
D) None of the above

Accepted Answer

The correct method for drawing a circle in Canvas is drawCircle. This method specifically requires the center coordinates of the circle and its radius to draw a circle on the canvas.

Question 15

Sounds are played using one of Android’s audio- ________ for alarms, music, notifications, phone rings, system sounds, phone calls and more. 
A) streams
B) players 
C) tools
D) None of the above

Accepted Answer

Android uses audio streams for playing different types of sounds. Each stream is associated with a specific type of sound and has its own volume level that can be controlled independently. Examples of audio streams include STREAM_ALARM, STREAM_MUSIC, STREAM_NOTIFICATION, STREAM_RING, etc.

Question 16

Game-development frameworks typically provide sophisticated ________ collision-detection capabilities.
A) pixel-based
B) perfect
C) pixel-perfect
D) None of the above

Accepted Answer

Pixel-perfect collision-detection capabilities provided by game-development frameworks are sophisticated and precise compared to pixel-based collision detection or perfect collision detection. The pixel-perfect approach ensures that collisions are detected accurately at the level of individual pixels.

Question 17

Which of the following statements is false?
A) When an Activity is shut down, its onDestroy method is called, which in turn calls the onDestroy methods of all the Fragments hosted by the Activity.
B) We used the onDestroy method in the MainActivityFragment to release the CannonView's sound resources.
C) Method onDestroy is guaranteed to be called, so it can be used to release resources and to save critical data.
D) The Android documentation recommends that you save data in methods onPause or onSaveInstanceState.

Accepted Answer

C) Method onDestroy is not guaranteed to be called by the Android system. It is recommended to release resources and save data in methods like onPause or onSaveInstanceState because these methods are more reliably called by the system.

Question 18

Game developers often use full-screen themes, such as Theme.Material.Light.NoActionBar.Fullscreen
That display only the bottom system bar, which in landscape orientation appears at the screen's ________.
A) top
B) bottom
C) left edge
D) right edge.

Accepted Answer

In landscape orientation, the bottom system bar typically appears at the right edge of the screen.

Question 19

Which of the following statements is false?
A) You configure and create a SoundPool object using a SoundPool.Builder object. 
B) You use an AudioAttributes.Builder object to create an AudioAttributes object that will be associated with the SoundPool. 
C) AudioAttributes’s setGameAudio method is used to designate the audio as game audio. 
D) Activity’s setVolumeControlStream method allows the game’s volume to be controlled with the device’s volume buttons.

Accepted Answer

The AudioAttributes class does not have a method called setGameAudio. Therefore, statement C is false.

Question 20

The Android documentation recommends that games use the ________ to play sounds, because that stream’s volume can be controlled via the device’s volume buttons. 
A) phone audio stream
B) alarm audio stream
C) notifications audio stream
D) music audio stream

Accepted Answer

The Android documentation recommends that games use the music audio stream to play sounds, because it allows the user to control the volume of the game sounds via the device’s volume buttons. The phone audio stream is reserved for voice calls, the alarm audio stream is reserved for alarms and timers, and the notifications audio stream is reserved for notifications and alerts.

Quiz 6: Cannon Game App

Pass ________ to an AudioAttributes.Builder object’s setUsage method to indicate that the audio is being used as game audio.

To process simple touch events in an app, override View method onTouchEvent, then use constants from class ________ (package android.view) to test which type of event occurred and process it accordingly.

When a View is inflated, its constructor is called with a Context and a(n) ________ as arguments.

Which of the next three statements is false?

There are seven sound streams identified by AudioManager constants. The mu-sic stream ________ is recommended for sound in games, because this stream’s volume can be controlled via the device’s buttons.

Each SurfaceView subclass should implement the interface ________, which contains methods that are called when the SurfaceView is created, changed (e.g., its size or orientation changes) or destroyed.

All updates to an app's user interface must be performed in the GUI thread of execution, because GUI components are not ________.

Which of the following statements is false?

Which of the next three statements is false?

A Frame-Layout is designed to display one View, but can also be used to ________ views.

An app’s sound effects are managed with a(n) ________ (package an-droid.media) , which can be used to load, play and unload sounds.

Canvas's ________ method draws a circle.

Sounds are played using one of Android’s audio- ________ for alarms, music, notifications, phone rings, system sounds, phone calls and more.

Game-development frameworks typically provide sophisticated ________ collision-detection capabilities.

Which of the following statements is false?

Game developers often use full-screen themes, such as Theme.Material.Light.NoActionBar.Fullscreen That display only the bottom system bar, which in landscape orientation appears at the screen's ________.

Which of the following statements is false?

The Android documentation recommends that games use the ________ to play sounds, because that stream’s volume can be controlled via the device’s volume buttons.