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

In our TeaViewModel class, that extends ViewModel, we have such prorerty:

val tea: LiveData

An observer in our Activity (type of mViewModel variable in example is TeaViewModel) is set in this way:

mViewModel!!.tea.observe(this, Observer { tea: Tea? -> displayTea(tea) })

What will be a correct displayTea method definition?

private fun displayTea()

private fun displayTea(tea: Tea?)

private fun displayTea(tea: LiveData?)

Question # 5

In general, you should send an AccessibilityEvent whenever the content of your custom view changes. For example, if you are implementing a custom slider bar that allows a user to select a numeric value by pressing the left or right arrows, your custom view should emit an event of type TYPE_VIEW_TEXT_CHANGED whenever the slider value changes. Which one of the following sample codes demonstrates the use of the sendAccessibilityEvent() method to report this event.

override fun dispatchPopulateAccessibilityEvent(event: AccessibilityEvent): Boolean {

return super.dispatchPopulateAccessibilityEvent(event).let { completed -> if (text?.isNotEmpty() == true) {

event.text.add(text) true

} else {

completed

}

override fun onKeyUp(keyCode: Int, event: KeyEvent): Boolean { return when(keyCode) {

KeyEvent.KEYCODE_DPAD_LEFT -> {

currentValue--

sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED)

true

}

...

}

override fun onKeyUp(keyCode: Int, event: KeyEvent): Boolean { return when(keyCode) {

KeyEvent.KEYCODE_ENTER -> {

currentValue--

sendAccessibilityEvent

(AccessibilityEvent.TYPE_VIEW_CONTEXT_CLICKED)

true

}

...

}

Question # 6

For example, we have a file in our raw folder app/src/main/res/raw/sample_teas.json. To get an

InputStream for reading it, from out Context context, we can do this:

val input = context!!.openRawResource(R.raw.sample_teas)

val input = context!!.getRawResource(R.raw.sample_teas)

val input = context!!.resources.openRawResource(R.raw.sample_teas)

Question # 7

The diagram below shows a basic form of the recommended architecture for apps that use Architecture Components. The architecture consists of a UI controller, a ViewModel that serves LiveData, a Repository, and a Room database. Drag modules to correct places.

Question # 8

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?

The value "b" would be set at first and later the main thread would override it with the value "a".

The value "a" would be set at first and later the main thread would override it with the value "b".

The value "b" would be set at first and would not be overridden with the value "a".

The value "a" would be set at first and would not be overridden with the value "b".

Question # 9

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

mTimerViewModel!!.timer.value.toString().observe

(Observer { aLong -> callAnyChangeUIMethodHere(aLong!!) })

mTimerViewModel!!.timer.observe

(this, Observer { aLong -> callAnyChangeUIMethodHere(aLong!!) })

mTimerViewModel.observe

(Observer { aLong -> callAnyChangeUIMethodHere(aLong!!) })