Associate-Android-Developer Google Developers Certification - Associate Android Developer (Kotlin and Java Exam) exact Exam Questions

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

Last Update 9 hours ago Total Questions : 128

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Question # 4

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:

creates a single list item and reuses it for visible content.

creates an unlimited number of list items and never reuses them

creates a limited number of list items and reuses them for visible content.

creates a single list item and never reuses it

Question # 5

As an example. In an Activity we have our TimerViewModel object (extended ViewModel), named mTimerViewModel. mTimerViewModel.getTimer() 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?

mTimerViewModel.getTimer().getValue().toString().observe(new Observer < Long > () {

@Override

public void onChanged(Long aLong) {

callAnyChangeUIMethodHere(aLong)

}

});

mTimerViewModel.getTimer().observe(this, new Observer < Long > () {

@Override

public void onChanged(Long aLong) {

callAnyChangeUIMethodHere(aLong)

}

});

mTimerViewModel.observe(new Observer < Long > () {

@Override

public void onChanged(Long aLong) {

callAnyChangeUIMethodHere(aLong)

}

});

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:

override fun onCreateOptionsMenu(menu: Menu): Boolean { menuInflater.inflate(R.menu.menu_main, menu)

return true

}

override fun onOptionsItemSelected(item: MenuItem): Boolean {

menuInflater.inflate(R.menu.menu_main, menu) return super.onOptionsItemSelected(item)

}

override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.menu.menu_main)

}

Question # 7

The Testing Pyramid, shown in the Figure, illustrates how your app should include the three categories of tests: small, medium, and large. Small tests are unit tests that :

validate your app ' s behavior one class at a time.

validate either interactions between levels of the stack within a module, or interactions between related modules.

validate user journeys spanning multiple modules of your app.

Question # 8

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.)

If more than one matching element is found, the first matching element in the layout hierarchy is returned as the target UiObject.

If no matching UI element is found, an IOException is thrown.

If more than one matching element is found, the last matching element in the layout hierarchy is returned as the target UiObject.

If no matching UI element is found, a UiAutomatorObjectNotFoundException is thrown.