How to implement the ScreenUiEngineAttachedListener Interface?
How to implement the ScreenUiEngineAttachedListener Interface? It is somewhat a mystery reading through the API.
I have a class that implements ScreenUiEngineAttachedListener:
public class UiListener implements ScreenUiEngineAttachedListener { public void onScreenUiEngineAttached(Screen screen, boolean attached) { } }
Then I have a class MyScreen which extends from screen and has two methods:
public void addScreenUiEngineAttachedListener(ScreenUiEngineAttachedListener listener) { super.addScreenUiEngineAttachedListener(listener); } private void removeScreenUiEngineAttachedListener() { }
- What is the correct positioning of everything?
- Can I define an instance of UiListener and pass in the addScreenUiEngineAttachedListener?
- How to remove UiListener in removeScreenUiEngineAttachedListener?
You will need:
- an instance of your UiListener - probably a static member inside your UiApplication;
- a method that allows to retrieve the reference to this instance of UiListener;
- a call in your constructor for the screen at addScreenUiEngineAttachedListener (yourApplication.getUiListener ()) or similar;
- potentially a call within your onScreenUiEngineAttached (attached screen, boolean) routine, the branch (attachment is false) : screen.removeScreenUiEngineAttachedListener (this);
However, all this is too much work for no gain. Just override protected void onUiEngineAttached (boolean attached) in your screen class and make your logic there - all members of your class are accessible and all the code is placed where it belongs.
Tags: BlackBerry Developers
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