Deck 1: Basics of Android: Hello World

Question 1

We can access the activity_main.xml resource file from the layout directory using the expression ___________.

Answer 1

R.layout.activity_main

Question 2

The colors.xml file contains ___________ constants.

Answer 2

color

Question 3

The int parameter of the setContentView( int ) method represents:

A) a count.
B) a random integer.
C) a resource.
D) 0 or 1.

Answer 3

a resource.

Question 4

What hex number represents green?

A) FF0000
B) 00FF00
C) 0000FF
D) 000000

Question 5

A color has been defined in colors.xml using < color name="myColor">#33FD42< /color>. How do you use it?

A) @color/myColor
B) @color/33FD42
C) color/myColor
D) color/33FD42

Question 6

It is possible to run an app inside the emulator in horizontal orientation.

Question 7

Which class do we use to send some output to Logcat?

A) Logcat
B) System
C) Print
D) Log

Question 8

It is possible to set up breakpoints throughout the code so that we can debug the app.

Question 9

In order to test an app on a device, we need to:

A) do nothing.
B) download a driver for the device.
C) disconnect the device from the computer.
D) download a device for the driver.

Question 10

The name of the XML attribute that we use to specify that an app will run in horizontal orientation only is:

A) android:orientation.
B) android:screen.
C) android:screenOrientation.
D) orientation.

Question 11

XML elements can be nested.

Question 12

Which of the following code snippets defines a valid dimension element?

A) < dimens name="my_margin">20dp< /dimens>
B) < dimen name="my_margin">20dp< /dimen>
C) < name dimen="my_margin">16dp< /name>
D) < my_margin name="dimen">16dp< /my_margin>

Question 13

Android apps can be distributed via:

A) the App Store.
B) the Android Market.
C) Google Play.
D) the Apple Store.

Question 14

The red, green, and blue values of a gray shade are all equal. Including black and white, how many shades of gray are there?

A) 8
B) 256
C) 16
D) 16.7 million

Question 15

The name of the directory where we should place the icon file for the app is:

A) drawable.
B) raw.
C) mipmap.
D) values.

Question 16

Which of the following defines a valid String element?

A) < strings name="my_name">20dp< /strings>
B) < string name="my_name">20dp< /string>
C) < name string="my_name">16dp< /name>
D) < my_name name="string">16dp< /my_name>

Question 17

The AppCompatActivity's direct superclass is:

A) MainActivity.
B) Activity.
C) AppCompat.
D) Main.

Question 18

The strings.xml file contains __________________ constants.

Question 19

AVD stands for __________________.

Question 20

It is possible to preview a GUI XML file inside the environment without running the app.

Question 21

It is possible to filter the output inside Logcat.

Question 22

An XML element can have only 0 or 1 attribute.

Question 23

We can test an app on a device only in vertical orientation.