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) })…
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? A. The value “b” would be set at first and later the main…
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?…
The following code snippet shows an example of an Espresso test: 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())) } 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())) } 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()))…
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…
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: A. override fun onCreateOptionsMenu(menu: Menu): Boolean…
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…
Select correct demonstration of WorkRequest cancellation. A. workManager.enqueue(OneTimeWorkRequest.Builder(FooWorker::class.java).build()) B. val request: WorkRequest = OneTimeWorkRequest.Builder(FooWorker::class.java).build() workManager.enqueue(request) val status = workManager.getWorkInfoByIdLiveData(request.id) status.observe(…) C. val request: WorkRequest = OneTimeWorkRequest.Builder(FooWorker::class.java).build() workManager.enqueue(request) workManager.cancelWorkById (request.id) D. val request1: WorkRequest = OneTimeWorkRequest.Builder(FooWorker::class.java).build() val request2: WorkRequest = OneTimeWorkRequest.Builder…
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: A. var builder = NotificationCompat.Builder(this,…
What is a correct part of an Implicit Intent for sharing data implementation? A. val sendIntent = Intent(this, UploadService::class.java).apply { putExtra(Intent.EXTRA_TEXT, textMessage) … B. val sendIntent = Intent().apply { type = Intent.ACTION_SEND; … C. val sendIntent = Intent(this, UploadService::class.java).apply {…