Question 1

@Query is the main annotation used in DAO classes. It allows you to perform read/write operations on a database. Each @Query method is verified at compile time, so what happens if there is a problem with the query?

Accepted Answer

A)  a runtime error occurs instead of a compilation failure. 
B)  a compilation error occurs instead of a runtime failure. 
C)  both compilation error and runtime failure occurs.

Question 2

Each time your test invokes onView() , Espresso waits to perform the corresponding UI action or assertion until the following synchronization conditions are met: (Choose three.)

Accepted Answer

A)  The message queue is empty. 
B)  The message queue is not empty. 
C)  There are some instances of AsyncTask currently executing a task. 
D)  There are no instances of AsyncTask currently executing a task. 
E)  Some developer-defined idling resources are not idle.
F) All developer-defined idling res

Question 3

Relative positioning is one of the basic building blocks of creating layouts in ConstraintLayout. Constraints allow you to position a given widget relative to another one. What constraints do not exist?

Accepted Answer

A)  layout_constraintBottom_toBottomOf 
B)  layout_constraintBaseline_toBaselineOf 
C)  layout_constraintBaseline_toStartOf 
D)  layout_constraintStart_toEndOf

Question 4

In a class PreferenceFragmentCompat . As a convenience, this fragment implements a click listener for any preference in the current hierarchy. So, in what overridden method we can handle that a preference in the tree rooted at this PreferenceScreen has been clicked?

Accepted Answer

A)  onCreateLayoutManager 
B)  onCreatePreferences 
C)  onCreateRecyclerView 
D)  onPreferenceTreeClick

Question 5

RecyclerView is a subclass of ViewGroup and is a more resource-efficient way to display scrollable lists. Instead of creating a View for each item that may or may not be visible on the screen, RecyclerView:

Accepted Answer

A)  creates a single list item and reuses it for visible content. 
B)  creates an unlimited number of list items and never reuses them 
C)  creates a limited number of list items and reuses them for visible content. 
D)  creates a single list item and never reuses it

Question 6

The easiest way of adding menu items  (to specify the options menu for an activity) is inflating an XML file into the Menu via MenuInflater. With menu_main.xml we can do it in this way:

Accepted Answer

A)  @Override 
public boolean onCreateOptionsMenu(Menu menu) {    
getMenuInflater().inflate(R.menu.menu_main, menu);    
return true;
 } 
B)  @Override 
public boolean onOptionsItemSelected(MenuItem item) {  
getMenuInflater().inflate(R.menu.menu_main, menu);    
return super.onOptionsItemSelected(item);
 } 
C)  @Override 
protected void onCreate(Bundle savedInstanceState) {    
super.onCreate(savedInstanceState);    
setContentView(R.menu.menu_main);
 }

Question 7

What is the incorrect statement about Data Access Object ( androidx.room.Dao )?

Accepted Answer

A)  Data Access Objects are the main classes where you define your database interactions. They can include a variety of query methods. 
B)  The class marked with @Dao should either be an interface or an abstract class. At compile time, Room will generate an implementation of this class when it is referenced by a Database. The class marked with @Dao should either be an interface or an abstract class. At compile time, Room will generate an implementation of this class when it is referenced by a Database. 
C)  An abstract @Dao class can optionally have a constructor that takes a Database as its only parameter. An abstract class can optionally have a constructor that takes a Database as its only parameter. 
D)  It is recommended to have only one Dao class in your codebase for all tables.

Question 8

If you want the Database Inspector to automatically update the data it presents as you interact with your running app, check the Live updates checkbox at the top of the inspector window. While live updates are enabled, what happens with the table in the inspector window?

Accepted Answer

A)  It is still editable. You can modify data in a table by double-clicking a cell, typing a new value, and pressing Enter. 
B)  It becomes read-only and you cannot modify its values. 
C)  It becomes read-only, but you cannot see its updated values before updating the data by clicking the Refresh table button at the top of the inspector window.

Question 9

What is illustrated in the picture?

Accepted Answer

A)  Logcat window with filter settings 
B)  Debugging native code using LLDB 
C)  The Variables and Watches panes in the Debugger window 
D)  The Breakpoints window lists all the current breakpoints and includes behavior settings for each 
E)  Adding a watchpoint to a variable in memory

Question 10

What statements about InputStreamReader (java.io.InputStreamReader) are correct? (Choose two.)

Accepted Answer

A)  An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified charset. The charset that it uses may be specified by name or may be given explicitly, or the platform's default charset may be accepted. 
B)  An InputStreamReader is a bridge from character streams to byte streams: It reads characters using a specified charset and encodes them into bytes. The charset that it uses may be specified by name or may be given explicitly, or the platform's default charset may be accepted. 
C)  Each invocation of one of an InputStreamReader's read() methods may cause one or more bytes to be read from the underlying byte-input stream. To enable the efficient conversion of bytes to characters, more bytes may be read ahead from the underlying stream than are necessary to satisfy the current read operation. 
D)  No any invocation of one of an InputStreamReader's read() methods can cause some bytes to be read from the underlying byte-input stream.

Question 11

To automate UI tests with Android Studio, you implement your test code in a separate Android test folder. Folder could be named:

Accepted Answer

A)  app/androidTest/java 
B)  app/src/androidTest/java 
C)  app/java/androidTest

Question 12

An overridden method onCreateOptionsMenu in an Activity returns boolean value. What does this value mean?

Accepted Answer

A)  You must return true for the menu to be displayed; if you return false it will not be shown. 
B)  You must return false for the menu to be displayed; if you return true it will not be shown. 
C)  You can return any value: the menu will be displayed anyway.

Question 13

Choose the most correct statement.

Accepted Answer

A)  Android is a closed source, Linux-based software stack created for a wide array of devices and form factors. 
B)  Android is a closed source, Windows-based software stack created for a wide array of devices and form factors. 
C)  Android is an open source, Linux-based software stack created for a wide array of devices and form factors. 
D)  Android is an open source software stack created for a highly limited array of devices and form factors.

Question 14

If you want to access a specific UI component in an app, use the UiSelector class. This class represents a query for specific elements in the currently displayed UI. What is correct about it? (Choose two.)

Accepted Answer

A)  If more than one matching element is found, the first matching element in the layout hierarchy is returned as the target UiObject. 
B)  If no matching UI element is found, an IOException is thrown. 
C)  If more than one matching element is found, the last matching element in the layout hierarchy is returned as the target UiObject. 
D)  If no matching UI element is found, a UiAutomatorObjectNotFoundException is thrown.

Question 15

About queries in DAO classes. Room verifies the return value of the query such that if the name of the field in the returned object doesn't match the corresponding column names in the query response, Room alerts you in one of the following two ways: (Choose two.)

Accepted Answer

A)  It gives a warning if no field names match. 
B)  It gives a warning if only some field names match. 
C)  It gives an error if no field names match. 
D)  It gives an error if only some field names match.

Question 16

Working with Custom View. To define custom attributes, we can add <declare-styleable> resources to our project. It is customary to put these resources into a file:

Accepted Answer

A)  res/layout/attrs.xml 
B)  res/values/attrs.xml 
C)  res/raw/attrs.xml 
D)  res/xml/attrs.xml

Question 17

Select correct statements about Hardware Abstraction Layer (HAL). (Choose two.)

Accepted Answer

A)  The HAL provides standard interfaces that expose device hardware capabilities to the higher-level Java API framework. 
B)  The HAL function both as apps for users and to provide key capabilities that developers can access from their own app. For example, if your app would like to deliver an SMS message, you don't need to build that functionality yourself - you can instead invoke whichever SMS app is already installed to deliver a message to the recipient you specify 
C)  The HAL consists of multiple library modules, each of which implements an interface for a specific type of hardware component, such as the camera or bluetooth module. When a framework API makes a call to access device hardware, the Android system loads the library module for that hardware component. 
D)  Using a HAL, not using a Linux kernel, allows Android to take advantage of key security features and allows device manufacturers to develop hardware drivers for a well-known kernel.

Question 18

To create a basic JUnit 4 test class, create a class that contains one or more test methods. A test method begins with the specific annotation and contains the code to exercise and verify a single functionality in the component that you want to test. What is the annotation?

Accepted Answer

A)  @RunWith 
B)  @LargeTest 
C)  @Rule 
D)  @Test

Question 19

If no any folder like res/anim-, res/drawable-, res/layout-, res/raw-, res/xml- exist in the project. Which folders are required in the project anyway? (Choose two.)

Accepted Answer

A)  res/anim/ 
B)  res/drawable/ 
C)  res/layout/ 
D)  res/raw/ 
E)  res/xml/

Question 20

When your code execution reaches the breakpoint, Android Studio pauses execution of your app. You can then use the tools in the Debugger tab to identify the state of the app. With Step Over  you can

Accepted Answer

A)  examine the object tree for a variable; expand it in the Variables view. 
B)  evaluate an expression at the current execution point 
C)  advance to the next line in the code (without entering a method) 
D)  advance to the first line inside a method call 
E)  advance to the next line outside the current method
F) continue running the app normally

Exam 7: Google Analytics Individual Qualification