Associate-Android-Developer Exam Training Practice Tests (Google Developers Certification - Associate Android Developer (Kotlin and Java Exam))]

Question 1

As an example. In an Activity we have our TimerViewModel object (extended ViewModel), named mTimerViewModel. mTimerViewModel.timer method returns a LiveData<Long> value. What can be a correct way to set an observer to change UI in case if data was changed?

A. mTimerViewModel!!.timer.value.toString().observe
(Observer { aLong -> callAnyChangeUIMethodHere(aLong!!) }) B. mTimerViewModel.observe
(Observer { aLong -> callAnyChangeUIMethodHere(aLong!!) }) C. mTimerViewModel!!.timer.observe
(this, Observer { aLong -> callAnyChangeUIMethodHere(aLong!!) })

Correct Answer: C

Question 2

LiveData.postValue() and LiveData.setValue() methods have some differences. So if you have a following code executed in the main thread:
liveData.postValue("a"); liveData.setValue("b");
What will be the correct statement?

A. The value "a" would be set at first and would not be overridden with the value "b". B. The value "b" would be set at first and would not be overridden with the value "a". C. The value "b" would be set at first and later the main thread would override it with the value "a". D. The value "a" would be set at first and later the main thread would override it with the value "b".

Correct Answer: D

Question 3

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

A. An abstract @Dao class can optionally have a constructor that takes a Database as its only parameter. B. It is recommended to have only one Dao class in your codebase for all tables. C. Data Access Objects are the main classes where you define your database interactions. They can include a variety of query methods. D. 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.

Correct Answer: B

Question 4

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 Evaluate Expression you can

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

Correct Answer: F

Question 5

If constant LENGTH_INDEFINITE is used as a parameter for the setDuration method in Snackbar, what will happen?

A. The Snackbar will be displayed for a long period of time. B. The Snackbar will be displayed for a very long period of time. C. The Snackbar will be displayed from the time that is shown until either it is dismissed, or another Snackbar is shown. D. The Snackbar will be displayed for a short period of time. E. The constant LENGTH_INDEFINITE is impossible parameter for the setDuration method in Snackbar

Correct Answer: C

Question 6

A class that you create for managing multiple data sources. In addition to a Room database, this class could manage remote data sources such as a web server. It is about:

A. Room database B. Activity/Fragment C. Repository D. ViewModel

Correct Answer: C

Google Developers Certification - Associate Android Developer (Kotlin and Java Exam) - Associate-Android-Developer Exam Practice Test