Deck 8: Graphics, Animations, Sounds and Gaming

Question 1

The ____________ package contains classes to draw and paint.

Answer 1

android.graphics

Question 2

The Color class defines constants and methods used to define colors represented by ____________.

Answer 2

integers

Question 3

Following is the API for the drawArc method of the Canvas class:
public void drawArc( RectF oval, float startAngle, float sweepAngle,
boolean useCenter, Paint paint )
If useCenter is false, we draw a wedge.

Answer 3

False

Question 4

Following is the API for the drawArc method of the Canvas class:
public void drawArc( RectF oval, float startAngle, float sweepAngle,
boolean useCenter, Paint paint )
If sweepAngle is positive, we draw the arc clockwise; otherwise, we draw the arc counterclockwise.

Question 5

Following is the API for one of the schedule methods of the Timer class:
Void schedule( TimerTask task, long d, long p )
What do d and p represent?

A) They represent two resources.
B) The task will start after d milliseconds; the task will run every p milliseconds.
C) The task will start after p milliseconds; the task will run every d milliseconds.
D) The task will last d milliseconds and will stop after p milliseconds.

Question 6

Once a Timer has started a task, it is not possible to cancel it.

Question 7

Both the invalidate and the postInvalidate methods of the View class have a version that accepts four parameters. These four parameters represent a rectangle within the View.

Question 8

It is possible to play several sounds simultaneously.

Question 9

c is a Canvas object reference, and p is a Paint object reference. What is the only valid statement?

A) p.drawCircle( 45, 50, 10, c);
B) c.drawCircle ( 10, p);
C) c.drawCircle( 45, 50, p);
D) c.drawCircle( 45, 50, 10, p);

Question 10

To create a SoundPool object, we first instantiate a SoundPool.Builder object and call the ____________ method of the SoundPool.Builder class.

Question 11

A Point is defined by ____________ integer coordinates.

Question 12

The Rect class encapsulates a(n) ____________.

Question 13

What method of the Paint class can we use to change the color of a Paint object?

A) setPaint
B) setColor
C) changeColor
D) color

Question 14

The Paint class supports anti-alias drawing.

Question 15

What class defines drawing styles and colors?

A) Paint
B) Style
C) Color
D) Graphics

Question 16

Which of the following is not a value of Paint.Style?

A) FILL
B) STROKE
C) FILL_AND_STROKE
D) NONE

Question 17

What method of the TimerTask class do we need to override and is also called automatically?

A) thread
B) go
C) task
D) run

Question 18

Following is the API for one of the load methods of the SoundPool class:
Int load( Context context, int i, int priority )
What does i represent?

A) A resource
B) The volume of the sound
C) The length of the sound
D) The number of times we will play the sound

Question 19

How do we access the width of a Bitmap object reference named b?

A) int w = Bitmap.width;
B) int w = b.getWidth( );
C) int b = w.getWidth( );
D) int Bitmap.b = getWidth( )

Question 20

The setColor method of the Paint class takes an int parameter; when calling this method, it is possible to pass a hexadecimal number as its argument.

Question 21

In the following statement, c is a Canvas reference, b is a Bitmap reference, r is a Rect reference, and p is a Paint reference.
c.drawBitmap( b, null, r, p );
The bitmap will be drawn in its entirety.

Question 22

It is possible to move a line drawn on the screen by moving your finger on the screen.

Question 23

The drawLine method of the Canvas class has this API:
void drawLine( float a, float b, float c, float d, Paint paint )
In this API, ( a, b ) represents the coordinate of the starting point of the line and ( c, d ) represents the coordinate of the ending point of the line.

Question 24

The BitmapFactory is a factory class to create __________________ objects.

Question 25

The postInvalidate method of the View class that has no parameter triggers a call to the __________________ method and refreshes the whole View.

Question 26

The SoundPool class, part of the __________________ package, enables us to load a sound and play it.

Question 27

The decodeResource method of the BitmapFactory class has this API:
static Bitmap decodeResource( Resources res, int i )
The parameter named i represents the __________________ of a resource.