Try Free Google Associate-Android-Developer Updated Questions & Answers

Question 1

Select a correct statement about PagedList.

APagedList is content-mutable. This means that new content can be loaded into an instance of PagedList and the loaded items themselves can change once loaded.

BPagedList is content-immutable. This means that, although new content can be loaded into an instance of PagedList, the loaded items themselves cannot change once loaded.

CPagedList is content-accidental. This means that new content can be loaded into an instance of PagedList and the loaded items themselves can be changed to accidental values randomly.

Correct answer: B

https://developer.android.com/topic/libraries/architecture/paging/ui

Question 2

Android uses adapters (from the Adapter class) to connect data with View items in a list. There are many different kinds of adapters available, and you can also write custom adapters. To connect data with View items, the adapter needs to know about the View items. From what is extended the entity that is usually used in an adapter and describes a View item and its position within the RecyclerView?

ARecyclerView.AdapterDataObserver

BRecyclerView.ItemDecoration

CRecyclerView.ViewHolder

DRecyclerViewAccessibilityDelegate

Correct answer: C

https://developer.android.com/guide/topics/ui/layout/recyclerview

Question 3

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

AmTimerViewModel.getTimer().getValue().toString().observe(new Observer<Long>() {
@Override
public void onChanged(Long aLong) {
callAnyChangeUIMethodHere(aLong)
}
});

BmTimerViewModel.getTimer().observe(this, new Observer<Long>() {
@Override
public void onChanged(Long aLong) {
callAnyChangeUIMethodHere(aLong)
}
});

CmTimerViewModel.observe(new Observer<Long>() {
@Override
public void onChanged(Long aLong) {
callAnyChangeUIMethodHere(aLong)
}
});

Correct answer: B

Question 4

When using an EditTexts or editable TextViews, or other editable View. What attribute to use to provide a content label for that View?

Aandroid:contentDescription

Bandroid:hint

Candroid:labelFor

Correct answer: B

https://support.google.com/accessibility/android/answer/7158690?hl=en

Question 5

Room can export your database's schema information into a JSON file at compile time. What annotation processor property you should set in your app/build.gradle file to export the schema?

Aroom.expandProjection

Broom.incremental

Croom.schemaLocation

Correct answer: C

android {

...

defaultConfig {

...

javaCompileOptions {

annotationProcessorOptions {

arguments += ['room.schemaLocation':

'$projectDir/schemas'.toString()]

}

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