Quiz 1

soft keyboard

The onscreen keyboard is called a ______.

tapping or gestures

Input can come in the form of ______ (using two fingers to pan, rotate, or zoom)

simplify the user experience

The primary design challenge is to ______.

soft or physical keyboard

Text entered via a ______ is the most common type of mobile input

Text components

can request different input types (e.g., plain text, phone number, various types of numeric values)

component type

can constrain the characters available

User experience

refers to all aspects of interaction with a device

id attribute

You can use the _______ in the Attributes pane to enter a name that begins with the prefix tv (for TextView)

string table (strings.xml)

String items displayed in the components of an app can be stored in the ______.

string array

can be used to store a group of related strings

String array

Defines a string resource of related items in a central location within strings.xml

item

defines an individual entry within a string array

Android Studio editor

As you type the string array XML code, the _______ offers suggestions in a panel that can complete a statement

Android background feature

can help provide an app's individual flair

White

The default color of Android background feature

background attribute

To change the the Android background, set the ______ in the Attributes pane.

hint

a short description of a component that is visible as gray text (also called a watermark) inside a Text Number component or any Text input

Hint

Often used to provide guidelines about the input expected in a component for the user

textColorHint attribute

you can change the color of the hint by changing the _______.

textColorHint Attribute

May be necessary to ensure adequate contrast between the text and background

Spinner component

Is similar to a drop-down list for selecting a single item from a fixed list

items

The Spinner component displays a prompt with a list of strings called _____.

prompt

which can be used to display instructions at the top of the Spinner control, is stored in strings.xml and is named ______.

entries

The Spinner attribute called ______ connects the string array in strings.xml to the Spinner component so the entries can be displayed in the application

spinnerMode attribute

sets the component to dialog mode or drop-down mode

layout_width, layout_height

The ______ and ______ attributes set the dimensions

ImageView components

should have a content description for visually impaired users

contentDescription attribute

description is provided by setting the ______.

Java variable

is used to contain data that changes during the execution of a program

final variable

can be initialized only once

Final variable

Attempting to reassign the value results in a compile error when the application runs

EditText class

For the concert tickets app, you insert code to create the tickets variable containing the extracted _________ text.

OnClickListener

waits in the background and listens for the user to click a button

Button event

Clicking the button activates a ______, triggering the Button event OnClick handler to execute the associated code.

result

Code to instantiate the TextView component to a variable named ______ is used to display the result of the ticket price calculation

(1) declare the variable

(2) assign a value to the variable

Two steps are necessary in order to use a variable:

eight

Java has _____ built-in primitive (simple) types of data

String type

is a class and not a primitive data type

string

can be a character, word, or phrase

type String

Most strings used in Java are objects of ______ (e.g., String groupChoice;)

Variables

must be declared before you can use them

getText()

Data stored in the EditText component can be read with the _______ method.

String

Data is read in as a ______, by default

Parse class

is used to convert strings into numbers

DecimalFormat

Java includes a class called ______ that provides patterns for formatting numbers for output on the Android devic

getSelectedItem()

The method that returns the text label of the

currently selected Spinner item

setText()

The method that displays text in a TextView component

+

You can concatenate text and string variable values using _______.