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Google Associate Android Developer Exam Practice Questions (P. 2)

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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?
  1. A
    val appItem: UiObject = device.findObject( UiSelector().className(ListView.class) .instance(1) .childSelector( UiSelector().text("Apps") ) )
  2. B
    val appItem: UiObject = device.findObject( UiSelector().className("android.widget.ListView") .instance(0) .childSelector( UiSelector().text("Apps") ) )
  3. C
    val appItem: UiObject = device.findObject( UiSelector().className("android.widget.ListView") .instance( UiSelector().text("Apps") ) )

Correct Answer:
B

Question #7
The following code snippet shows an example of an Espresso test:
  1. A
    @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())) }
  2. B
    @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())) }
  3. C
    @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())) }

Correct Answer:
B

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

Correct Answer:
B

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

Correct Answer:
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?
  1. A
    private fun displayTea()
  2. B
    private fun displayTea(tea: Tea?)
  3. C
    private fun displayTea(tea: LiveData?<Tea>)
  4. D
    private fun displayTea(tea: LiveData?<T>)

Correct Answer:
B

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