Associate-Android-Developer 試験問題を無料オンラインアクセス

What is the incorrect statement about Data Access Object (androidx.room.Dao)?

• A.The class marked with @Dao should either be an interface or an abstract class. At compile time, Room will generate an implementation of this class when it is referenced by a Database.
• B.An abstract @Dao class can optionally have a constructor that takes a Database as its only parameter.
• C.It is recommended to have only one Dao class in your codebase for all tables.
• D.Data Access Objects are the main classes where you define your database interactions. They can include a variety of query methods.

Enable debugging on your device: If you are using the emulator, this is enabled by default. But for a connected device, you need to

• A.enable transfer data from the device in usb connection options.
• B.enable debugging in the device developer options.
• C.enable connection in bluetooth options.

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)).do(typeText("Steve"));
  onView(withId(R.id.greet_button)).do(click());
  onView(withText("Hello Steve!")).compare(matches(isDisplayed()));
  }
• C.@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()));
  }

If you are working with a Builder that creates a PeriodicWorkRequest to run periodically once within the flex period of every interval period. What statement is correct?

• A.The repeat interval must be greater than PeriodicWorkRequest.MIN_PERIODIC_INTERVAL_MILLIS and the flex interval must be greater than PeriodicWorkRequest.MIN_PERIODIC_FLEX_MILLIS.
• B.The repeat interval must be greater than or equal to PeriodicWorkRequest.MIN_PERIODIC_INTERVAL_MILLIS and the flex interval can be anything in relation to PeriodicWorkRequest.MIN_PERIODIC_FLEX_MILLIS.
• C.The repeat interval must be lower than or equal to PeriodicWorkRequest.MIN_PERIODIC_INTERVAL_MILLIS and the flex interval must be lower than or equal to PeriodicWorkRequest.MIN_PERIODIC_FLEX_MILLIS.
• D.The repeat interval must be greater than or equal to PeriodicWorkRequest.MIN_PERIODIC_INTERVAL_MILLIS and the flex interval must be greater than or equal to PeriodicWorkRequest.MIN_PERIODIC_FLEX_MILLIS.

SharedPreferences.Editor is an interface used for modifying values in a SharedPreferences object. All changes you make in an editor are batched, and not copied back to the original SharedPreferences until you call:

• A.commit() or apply()
• B.apply()
• C.commit()