Deck 3: Engage Android User Input, Variables, and Operations

Question 1

Which kind of TextView can suggest the completion of a word after the first few letters?

A) AutoComplete TextView
B) Alphanumeric TextView
C) Imaging TextView
D) String TextView

Answer 1

A

Question 2

Java variable names are case sensitive.

Answer 2

True

Question 3

You can use int and long data types to store floating point values.

Answer 3

False

Question 4

What is the on-screen keyboard called?

A) electronic keyboard
B) screenboard
C) soft keyboard
D) touchkey

Question 5

Good graphic design communicates simplicity.

Question 6

Which of the following terms best describes a widget similar to a drop-down list for selecting a single item from a fixed listing?

A) EditText control
B) Message control
C) Spinner control
D) TextView control

Question 7

The aim of requesting input from the user is to ensure that every user experience is the same every time the app is used.

Question 8

You should always declare variables in an Android application at the end of the Activity.

Question 9

It is possible to add a predefined system theme or a customized theme of your own design.

Question 10

What is used in a Java program to contain data that changes during the execution of the program?

A) constant
B) item
C) literal
D) variable

Question 11

What defines a string resource of related items in a central location within strings.xml?

A) text table
B) string matrix
C) string array
D) character column

Question 12

Which term is best defined as a short description of a field that is visible as light-colored text?

A) abstract
B) clue
C) hint
D) synopsis

Question 13

An application with an appealing graphical design is preferred over applications that are textual in nature.

Question 14

Which kind of variable can be initialized only once?

A) final variable
B) local variable
C) static variable
D) temporary variable

Question 15

What can be used to display instructions at the top of Spinner controls?

A) abstract
B) hint
C) lead-in
D) prompt

Question 16

The String type is a class, not a primitive data type.

Question 17

The default value for a boolean variable is True.

Question 18

Which file is a default file that contains commonly used strings for an application?

A) consts.xml
B) data.xml
C) strings.xml
D) values.xml

Question 19

What term can be described as multitouch interactions such as pressing two fingers to pan, rotate, or zoom?

A) taps
B) gestures
C) actions
D) swipes

Question 20

Plus ( + ) and minus ( - ) have the highest order of precedence in the order of operations.

Question 21

What does the R in findViewById(R.id.txtTickets) refer to?

A) the resource folder for the app
B) the resources available to the app
C) a static property of the txtTickets variable
D) a variable named 'R'

Question 22

To assign a phrase as the value of a String variable, in which of the following characters should the text be placed?

A) brackets
B) double quotation marks
C) parentheses
D) single quotation marks

Question 23

What keystroke can you use to invoke possible code completion suggestions as you type an XML or Java line of code?

A) Ctrl+space
B) Alt+home
C) Ctrl+end
D) Alt+insert

Question 24

What method returns the text label from a selected Spinner item?

A) getItem()
B) getSelectedItem()
C) getSpinnerItem()
D) selectedItem()

Question 25

What Java class should you use if you want to format a number such as 279.55 to display in currency format such as $279.55?

A) DecimalFormat
B) DollarFormat
C) NumericFormat
D) StringFormat

Question 26

Which statement establishes a currency decimal format so that the variable itemCost is displayed in U.S. dollar format in the following statement? USdollars.format(itemCost));

A) new USdollars = DecimalFormat("$###,###.##");
B) CurrencyFormat USdollars = new CurrencyFormat("$###,###.##");
C) DecimalFormat USdollars = new DecimalFormat("$###,###.##");
D) new USdollars = CurrencyFormat("$###,###.##");

Question 27

____________________ are multitouch interactions such as pressing two fingers to pan, rotate, or zoom.

Question 28

Use a _____________ inside a Text Field control to give users guidelines about the input expected i n the control.

Question 29

What do you use if you want an app to wait for a user to click or tap a button before taking action?

A) onClickListener()
B) onCreate()
C) findViewById()
D) setContentView()

Question 30

When you select the ____________________ Text Field, Android deactivates the letters on the keyboard. 

Question 31

Which class should you use if you want to convert the string "123" to the number one hundred and twenty-three?

A) parseInt()
B) strInt()
C) convertStr()
D) convertNum()

Question 32

Which data type is NOT a primitive that holds numeric values?

A) byte
B) char
C) int
D) short

Question 33

You add new theme names to the XML code in the _______________ file.

Question 34

You have a variable that will only assume values between 0 and 100. What would be the most compact primitive type to use?

A) byte
B) float
C) int
D) long

Question 35

A(n) ____________________ is a style applied to an Activity or an entire application.

Question 36

What must you do before you can use a variable in a Java application?

A) delcare it
B) check its data type
C) display it
D) store it in the manifest

Question 37

Which of the following operators has the highest order of precedence?

A) ()
B) ++
C) %
D) -

Question 38

Which primitive data type should you use if the variable should have only two values and will be used in conditional statements?

A) char
B) byte
C) boolean
D) int

Question 39

To display text in a TextView control, which method should be used?

A) assignText()
B) displayText()
C) setText()
D) showText()

Question 40

Choose the option that completes the following code so that the text is displayed in a TextView object named displayText .
String sports = "Football";
String fall = sports + " season begins in the Fall.";
---- code goes here ----

A) displayText.getText(sports+fall);
B) displayText = fall.getText();
C) setText(fall).displayText;
D) displayText.setText(fall);

Question 41

Write the statement to display the string "It's my birthday!" in a TextView object named whatsToday. ______________________________

Question 42

The property that connects a Spinner control to a list of items is called ____________________.

Question 43

The code needed to declare a variable called costPerTicket and initialize it to the value 79.99 is ____________________.

Question 44

When a plus sign is placed between two strings, it ____________________ the two strings to create a new string value.

Question 45

The code to decrement an integer variable called counter by 1 is as follows: ____________________.

Question 46

A Spinner control holds multiple text strings and it is best to use a(n) ________________ that can be referenced from the String Resources in the application.

Question 47

The Parse type to extract a double from a String is ____________________.

Question 48

A Spinner control displays a prompt with a list of strings, called ____________________, in a pop-up window.

Question 49

The code necessary to read a number out of an EditText control called txtNumberOfTickets and convert it to an integer, assigned to the variable numTickets , is as follows: ____________________.

Question 50

The code necessary to find an EditText by the name of txtTickets is as follows: ____________________.