Revisting the UiEngine and screen life cycle, just to be sure I understand why I'm short-term memory

For arguments sake, let's say I have a UiApplication from where I have a class named MyScreen that extends the screen. MyScreen, I background of work and every time I push a new screen the setTitle is called with a different value.

With this configuration, I push the following screens on the display stack using a menu that looks like:

  • Press 3
  • Press 2
  • Press 1

And I create my screens as follows, depending on which menu item has its run method invoked.

For screen 1 and so on...

MyScreen newScreen = new MyScreen();
newScreen.setTitle("Screen 1");

MyScreen newScreen = new MyScreen();
newScreen.setTitle("Screen 2");

MyScreen newScreen = new MyScreen();
newScreen.setTitle("Screen 3");

But what happens if I select the item of menu 3 push again, then push 2 once again, my display stack looks like:

  • Screen 2
  • Screen 3
  • Screen 3
  • Screen 2
  • Screen 1

That's why I have five instances of my object type newScreen MyScreen, correct?

Each of these five instances of my newScreen object must go through the life cycle standard screen?

The only method of onUiEngineAttached race twice whenever my newScreen object is pushed and pulled. attached to the true value when the battery display and attached is false when it is taken from the stack display?

As a result, the screen stack above, onUiEngineAttached is called a total of ten times?

protected void onUiEngineAttached(boolean attached)

Todd,

Your description fits what I understand to occur.  RexDoug is concerned that you do not create a new instance of your screen, but I think that you are, you have 5 instances of your screen, some with identical titles.

Tags: BlackBerry Developers

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