Table of the screen

I am trying to build a simple note in application. The new note button click grows a new screen in a picture of the screen with a position more in the table of x with each click. This continues resulting in a nullpointer error, although I declare the screen of the table before calling it, using newscreen [x] = new newscreen(); the table is declared publicly, out of the method for the button is created. This is done correctly, or is there a better way to solve this problem?

In general, I would say keeping a screen, just so that you can quickly push once again, there is little of value.  Create and fill in a simple text screen takes very little time, so I would just have a details screen open at the same time, display the correct entry.  And you're right, it's easier.

It is very easy to persist a table.  Yet once again, I would not continue a table, I would persist a vector.  You persist the vector, then each screen can just pick up their element in the vector.  Each screen would put their point in the right place in the vector too, and then persist the vector to hold everything. Indeed, persistentstore is smart enough to understand that you have changed only one object in the vector and so he'll only actually write this object in persistentstore, the remaining unchanged objects are left as they were.  So he did no big overhead that with a collection as a vector object.

Sorry I don't have any example of persistence code a vector is very practical, but you made a setContents for the vector.  When you get home it vector of PersistentStore, you simply choose .elementAt (n), where n is the number of your note.   To replace, setElementAt (...), then validate the vector.

Tags: BlackBerry Developers

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