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

Question 1

What is a correct part of an Implicit Intent for sharing data implementation?

Accepted Answer

val sendIntent = Intent().apply { action = Intent.ACTION_SEND ...

Answer

val sendIntent = Intent(this, UploadService::class.java).apply { putExtra(Intent.EXTRA_TEXT, textMessage)
...

Answer

val sendIntent = Intent().apply { type = Intent.ACTION_SEND; ...

Answer

val sendIntent = Intent(this, UploadService::class.java).apply { data = Uri.parse(fileUrl) ...

Question 2

By default, the notification's text content is truncated to fit one line. If you want your notification to  be longer, for example, to create a larger text area, you can do it in this way:

Accepted Answer

var builder = NotificationCompat.Builder(this, CHANNEL_ID) .setContentText(\"Much longer text that cannot fit one line...")
.setStyle(NotificationCompat.BigTextStyle()
.bigText("Much longer text that cannot fit one line..."))
...

Answer

var builder = NotificationCompat.Builder(this, CHANNEL_ID) .setContentText(\"Much longer text that cannot fit one line...")
.setLongText("Much longer text that cannot fit one line..."))
...

Answer

var builder = NotificationCompat.Builder(this, CHANNEL_ID) .setContentText(\"Much longer text that cannot fit one line...")
.setTheme(android.R.style.Theme_LongText);
...

Question 3

Select correct demonstration of WorkRequest cancellation.

Accepted Answer

val request: WorkRequest = OneTimeWorkRequest.Builder (FooWorker::class.java).build() workManager.enqueue(request) workManager.cancelWorkById(request.id)

Answer

workManager.enqueue(OneTimeWorkRequest.Builder(FooWorker::class.java).build())

Answer

val request: WorkRequest = OneTimeWorkRequest.Builder (FooWorker::class.java).build() workManager.enqueue(request)
val status = workManager.getWorkInfoByIdLiveData(request.id) status.observe(...)

Answer

val request1: WorkRequest = OneTimeWorkRequest.Builder (FooWorker::class.java).build() val request2: WorkRequest = OneTimeWorkRequest.Builder (BarWorker::class.java).build()
val request3: WorkRequest = OneTimeWorkRequest.Builder (BazWorker::class.java).build()
workManager.beginWith(request1, request2).then(request3).enqueue()

Answer

val request: WorkRequest = OneTimeWorkRequest.Builder (FooWorker::class.java).build() workManager.enqueue(request) workManager.cancelWork(request)

Question 4

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.

Accepted Answer

override fun onKeyUp(keyCode: Int, event: KeyEvent): Boolean { return when(keyCode) { KeyEvent.KEYCODE_DPAD_LEFT -> {
currentValue--
sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED)
true
}
...
}
}

Answer

override fun dispatchPopulateAccessibilityEvent(event: AccessibilityEvent): Boolean { return super.dispatchPopulateAccessibilityEvent(event).let { completed -> if (text?.isNotEmpty() ==
true) {
event.text.add(text) true
} else {
completed
}
}
}

Answer

override fun onKeyUp(keyCode: Int, event: KeyEvent): Boolean { return when(keyCode) { KeyEvent.KEYCODE_ENTER -> {
currentValue--
sendAccessibilityEvent
(AccessibilityEvent.TYPE_VIEW_CONTEXT_CLICKED)
true
}
...
}
}

Question 5

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

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

Answer

override fun onOptionsItemSelected(item: MenuItem): Boolean { menuInflater.inflate(R.menu.menu_main, menu) return super.onOptionsItemSelected(item)
}

Answer

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

Question 6

Android Tests. You can use the childSelector() method to nest multiple UiSelector instances. For  example, the following code example shows how your test might specify a search to find the first 
ListView in the currently displayed UI, then search within that ListView to find a UI element with the 
text property Apps. 
What is the correct sample?

Accepted Answer

val appItem: UiObject = device.findObject( UiSelector().className(\"android.widget.ListView") .instance(0)
.childSelector(
UiSelector().text("Apps")
)
)

Answer

val appItem: UiObject = device.findObject( UiSelector().className(ListView.class) .instance(1)
.childSelector(
UiSelector().text(\"Apps")
)
)

Answer

val appItem: UiObject = device.findObject( UiSelector().className(\"android.widget.ListView") .instance(
UiSelector().text("Apps")
)
)

Question 7

The following code snippet shows an example of an Espresso test:

Accepted Answer

@Test fun greeterSaysHello() {
onView(withId(R.id.name_field)).perform(typeText(\"Steve"))
onView(withId(R.id.greet_button)).perform(click())
onView(withText("Hello Steve!")).check(matches(isDisplayed()))
}

Answer

@Rule fun greeterSaysHello() {
onView(withId(R.id.name_field)).do(typeText(\"Steve"))
onView(withId(R.id.greet_button)).do(click())
onView(withText("Hello Steve!")).check(matches(isDisplayed()))
}

Answer

@Test fun greeterSaysHello() {
onView(withId(R.id.name_field)).do(typeText(\"Steve"))
onView(withId(R.id.greet_button)).do(click())
onView(withText("Hello Steve!")).compare(matches(isDisplayed()))
}

Question 8

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?

Accepted Answer

mTimerViewModel!!.timer.observe (this, Observer { aLong -> callAnyChangeUIMethodHere(aLong!!) })

Answer

mTimerViewModel!!.timer.value.toString().observe (Observer { aLong -> callAnyChangeUIMethodHere(aLong!!) })

Answer

mTimerViewModel.observe (Observer { aLong -> callAnyChangeUIMethodHere(aLong!!) })

Question 9

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?

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 10

In our TeaViewModel class, that extends ViewModel, we have such prorerty:  val tea: LiveData<Tea> 
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?

Accepted Answer

private fun displayTea(tea: Tea?)

Answer

private fun displayTea()

Answer

private fun displayTea(tea: LiveData?<Tea>)

Answer

private fun displayTea(tea: LiveData?<T>)

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

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