Hi Sam,
I don't think you can create your own components because:
1. All the ui classes that extend Component are final, so can't themselves be
extended.
2. You can implement your own Component, but you have to add it to a Panel to
be useful. Unlike the Canvas, Panel has no paint(), so there's no way to
describe how your Component is rendered. Your alpha error is probably the VM
trying to call the native paint() equivalent of your component, which doesn't
exist. Or not.
It's probably because they wanted to keep the API's as small as possible,
because you can extend and implement your own components quite easily in AWT.
--jason
--- Sam Joseph <gaijin@yha.att.ne.jp> wrote:
>
> Hi All,
>
> I've been working on making a little Gauge display for DoJa, you know
> the kind that tells you how far you are through a download process etc.
>
> Anyway, I was pleased to find that by creating the appropriate package,
> I was able to get a gauge thing working in 505 and 504 emulators:
>
> com.nttdocomo.ui.Gauge
>
> However when I load it on to my SH505 I get an "alpha
> error" message. I've tried the precise same appli with and without my
> gauge and it seems like it is the presence of my gauge that is causing
> the error.
>
> This seems like a real shame, as being able to create new UI components
> would be extremely convenient, but I guess there's some barrier to it on
> the phone such as a restriction on using the com.nttdocomo.* classes or
> something else.
>
> I was wondering if anyone else had ever tried this sort of thing,
> experienced the same sort of error.
>
> Thanks in advance.
>
> CHEERS> SAM
>
>
>
> This mail was sent to address jasonpollard@yahoo.com
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Received on Wed Sep 17 12:09:35 2003