Mobile Development

[capitolc]

I have a mobile device running WM 5, and have successfully ported over a java application (.jar) which ran. To my dismay, I am not seeing the full application due to the physical size and lack of scrollbars. Where are the scrollbars? Shouldn't they be automatic since everything isn't shown within the display screen size?

Another thing, since I'm working with a mobile, is there anyway to adjust the size of each component? That way I can make things more compact and won't have to rely on the scrollbar so much??

...thanks for any help gurus. (I'm trying to make it work)

[Deliverance]

I'm going to give you a general answer since I don't do much development at all with Swing or AWT.

http://java.sun.com/javase/6/docs/ap...t/Toolkit.html

Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();

From there, you know what you have to work with, so I would think that the root frame is always created / adjusted to fit the maximum size of the window, and all subcomponents that you add from there-on-in are percentage based to handle the resize.

I'm not sure if you would need a listener for when a screen size is modified (windows mobile may add it's own frames around the screen like with IE when you press the 'menu' button), but you may want to handle that somehow as well.

Not sure about your scrollbars, but if I remember correctly, there is a property on a component to display scrollbars always, never, or if required. You might want to look into that.

[dlorde]

Have you tried using a scroll pane to give you scroll bars ?

Good teaching is more a giving of the right questions than a giving of the right answers...
J. Albers

[capitolc]

@Deliverance

yea man, I came across getScreenSize() already. What gets me, when I run the app on my local computer, it seems to grow just as big as my widescreen monitor, no problem. But when I import the file to my mobile device, I only see part of what I think should be there. I fear my components are just too big to be display correctly and thus stretching out my view passed the screen size.

@Dlorde

Actually, I did just discover JScrollPane and ScrollPaneLayout late last night. I'm playing with a small example now, but I haven't wired it up to my own code just yet. The problem I'm having is that JScrollPane uses a BorderLayout and what I created uses GridBagLayout. Since I'm just beginning with Java, I have to redo my GUI on a BorderLayout and/or get everything on a ScrollPaneLayout (I don't know if thats one of the same or not).

[Deliverance]

Make sure there isn't a minimum size set on these components that you have to override.

[dlorde]

The problem I'm having is that JScrollPane uses a BorderLayout and what I created uses GridBagLayout. Since I'm just beginning with Java, I have to redo my GUI on a BorderLayout and/or get everything on a ScrollPaneLayout (I don't know if thats one of the same or not).

Try putting your GridBagLayout stuff into a JPanel, and then putting that into the scroll pane (it should default to the center area which is sizeable in all directions). The GridBagLayout panel should size itself to its contents, and the scroll pane should display scroll bars if the panel is too large.

Computer Science is a science of abstraction -creating the right model for a problem and devising the appropriate mechanizable techniques to solve it...
A. Aho and J. Ullman

[capitolc]

... thanks Dlorde, got it where my srcollbar shows up just as you suggested.


For another question/concern. For anybody with java development on a mobile device, I've included an JPG to a JLabel for display. I run my app on my laptop and it came up no problem. When I moved everything of my mobile device, the image doesn't appear. Any thoughts? (I have yet to try a GIF/BMP/PNG image yet - thats next)

Speaking of things not showing up, most of the time when I launch my app, non of my componets show up at first. I have to resize my window for everything to appear. What gives? It happens more times than not, but I need to counter-act this. Is there like a paint.refresh() in java?

[dlorde]

Speaking of things not showing up, most of the time when I launch my app, non of my componets show up at first. I have to resize my window for everything to appear. What gives? It happens more times than not, but I need to counter-act this. Is there like a paint.refresh() in java?

All the components should show up every time if you've coded it right. Do you call pack() on the top-level frame before you call setVisible(true) ?

There are methods to repaint the components - validate() will recursively layout and repaint all that need painting, and repaint() will paint an individual component, but you should only need them if you change something (add or remove a component, or custom paint a component) while the GUI is displayed.

The outcome of any serious research can only be to make two questions grow where only one grew before...
T. Veblen

[capitolc]

I wonder if running my jar executable through a 3rd party is causing my errors on my mobile device. The application is called Mysaifu JVM. Can you recommend another JRE I can use for Windows Mobile 5.0?

my problem is still, the image file that I have is not showing up. I tried bmp/jpg/gif/png formats, but nothing. The image shows up fine when I run it from my computer, but never on my mobile device. I also tried shrinking down the image to a 100x85 - no luck. I placed the image on another JPanel, then attach that one to my main -no luck.

This is starting to get frustrating, but do yu have any ideas?