For example, our preferences.xmlfile was added by addPreferencesFromResource(R.xml.preferences). Our preferences.xmlfile contains such item:
In our Fragment, we can dynamically get current notification preference value in this way:
A. boolean isNotificationOn = PreferenceManager.getDefaultSharedPreferences(getContext()).getBoolean(getContext().getString(R.string.pref_notification_key),getContext().getResources().getBoolean(R.bool.pref_notification_default_value)
);
B. boolean isNotificationOn = PreferenceManager.getSharedPreferences(getContext()).getBoolean(getContext().getString(R.string.pref_notification_default_value),getContext().getString(R.string.pref_notification_key)
);
C. boolean isNotificationOn = PreferenceManager.getSharedPreferences(getContext()).getBoolean(getContext().getResources().getBoolean(R.bool.pref_notification_default_value),getContext().getString(R.string.pref_notification_key)
);
In our TeaViewModelclass, that extends ViewModel, we have such method:
public LiveData
An observer in our Activity (type of mViewModelvariable in example is TeaViewModel) is set in this way:
mViewModel.getTea().observe(this, this::displayTea);
What will be a correct displayTea method definition?
A. private void displayTea()
B. private void displayTea(Tea tea)
C. private void displayTea(LiveData
D. private void displayTea(LiveData
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 thread would override it with the value "a".
B. The value "a" would be set at first and later the main thread would override it with the value "b".
C. The value "b" would be set at first and would not be overridden with the value "a".
D. The value "a" would be set at first and would not be overridden with the value "b".
As an example. In an Activity we have our TimerViewModel object (extended ViewModel), named mTimerViewModel. mTimerViewModel.getTimer() method returns a LiveData
A. mTimerViewModel.getTimer().getValue().toString().observe(new Observer
callAnyChangeUIMethodHere(aLong)
}
});
B. mTimerViewModel.getTimer().observe(this, new Observer
callAnyChangeUIMethodHere(aLong)
}
});
C. mTimerViewModel.observe(new Observer
callAnyChangeUIMethodHere(aLong)
}
});
The following code snippet shows an example of an Espresso test:
A. @Rule
public void 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
public void 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
public void 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 that ListView to find a UI element with the text property Apps. What is the correct sample?
A. UiObject appItem = device.findObject(new UiSelector().className(ListView.class).instance(1).childSelector(new UiSelector().text("Apps")));
B. UiObject appItem = device.findObject(new UiSelector().className("android.widget.ListView").instance(0).childSelector(new UiSelector().text("Apps")));
C. UiObject appItem = device.findObject(new UiSelector().className("android.widget.ListView").instance(new UiSelector().text("Apps")));
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
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
B. @Override
public boolean onOptionsItemSelected(MenuItem item) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return super.onOptionsItemSelected(item);
}
C. @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.menu.menu_main);
}
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.
A. @Override
public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
boolean completed = super.dispatchPopulateAccessibilityEvent(event);
CharSequence text = getText();
if (!TextUtils.isEmpty(text)) {
event.getText().add(text);
return true;
}
return completed;
}
B. @Overridepublic boolean onKeyUp (int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT) {
currentValue--;
sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED);
return true;
}
...
}
C. @Overridepublic boolean onKeyUp (int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_ENTER) {
currentValue--;
sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CONTEXT_CLICKED);
return true;
}
...
}
"workManager" is an instance of WorkManager. Select correct demonstration of WorkRequest cancellation:
A. workManager.enqueue(new OneTimeWorkRequest.Builder(FooWorker.class).build());
B. WorkRequest request = new OneTimeWorkRequest.Builder(FooWorker.class).build();workManager.enqueue(request);LiveData
C. WorkRequest request = new OneTimeWorkRequest.Builder(FooWorker.class).build();workManager.enqueue(request);workManager.cancelWorkById(request.getId());
D. WorkRequest request1 = new OneTimeWorkRequest.Builder(FooWorker.class).build();WorkRequest request2 = new OneTimeWorkRequest.Builder(BarWorker.class).build();WorkRequest request3 = new OneTimeWorkRequest.Builder(BazWorker.class).build();workManager.beginWith(request1, request2).then(request3).enqueue();
E. WorkRequest request = new OneTimeWorkRequest.Builder(FooWorker.class).build();workManager.enqueue(request);workManager.cancelWork(request);
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. NotificationCompat.Builder builder = new NotificationCompat.Builder(this, CHANNEL_ID).setContentText("Much longer text that cannot fit one line...").setStyle(new NotificationCompat.BigTextStyle()
.bigText("Much longer text that cannot fit one line..."))
...
B. NotificationCompat.Builder builder = new NotificationCompat.Builder(this, CHANNEL_ID).setContentText("Much longer text that cannot fit one line...")
.setLongText("Much longer text that cannot fit one line..."))
...
C. NotificationCompat.Builder builder = new NotificationCompat.Builder(this, CHANNEL_ID).setContentText("Much longer text that cannot fit one line...")
.setTheme(android.R.style.Theme_LongText);
...
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