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Java Development

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Developer
peter_strange
Posts: 19,608
Registered: ‎07-14-2008
My Device: Not Specified

Re: HorizontalField scrolling per item

So where is this Null Pointer Exception actually happening? 

 

Remember we can't see your code running so you have to tell us as much as you possibly can.  In this case I would have thought that running this code in the debugger would tell you where the NPE happened.

 

Looking at this code, it is not what I expected given my suggestion.  Here is what I suggested:

 

"Detect the swipe in the touchEvent for the Manager.  Detect the direction, and then find out what Field is in focus.  If swipe to the left, set focus on the previous field to the one currently in focus (assuming you are not right at the end).  Other way round for a swipe the other way obviously." 

 

I don't see anything in your code that attempts to find out the currently focused Field and then figure out which is the next Field to receive focus given the direction you are moving in.  Look at

<field>.getIndex

and

<manager>.getFieldCOunt()

to help you with this.

 

Finally this seems completely redundant doesn't it?

 

hfm.getFieldWithFocus().setFocus();

 

Why would you need to set the focus on the Field that has focus?

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