Recall from the basic Screenlet creation tutorial that an event class is
required to handle communication between Screenlet components. Also recall that
many Screenlets can use the event class included with Screens, BasicEvent, as
their event class. For offline mode to work, however, you must create an event
class that extends CacheEvent
(click here
to see CacheEvent). Your event class has one primary responsibility: store and
provide access to the arguments passed to the Interactor. To accomplish this,
your event class should do these things:
- Extend
CacheEvent. For the arguments, define variables and public getter methods. - Define a no-argument constructor that only calls the corresponding superclass constructor.
- Define a constructor that sets the Interactor’s arguments.
In the case of Add Bookmark Screenlet, the arguments are the bookmark’s URL,
folder ID, and title. For example, here’s the full code for this Screenlet’s
event class, BookmarkEvent:
public class BookmarkEvent extends CacheEvent {
private String url;
private String title;
private long folderId;
public BookmarkEvent() {
super();
}
public BookmarkEvent(String url, String title, long folderId) {
this.url = url;
this.title = title;
this.folderId = folderId;
}
public String getURL() {
return url;
}
public String getTitle() {
return title;
}
public long getFolderId() {
return folderId;
}
}
Next, you’ll update the listener.