Blackberry app is very slow on startup, how can i fix this? - blackberry

Question

I recently updated my app to work on nearly all of the phones. I did this by having the first screen detect the screen size and then change all the images (there are a lot of images). As such, the startup on the non-base model phones is like 15 seconds, it looks like the phone is freezing but its just changing the images. It does this every time I open the app. What can I do to fix this?

Answer 1

Make sure that you are resizing images on a separate thread (no UI Blocking operation).
It would be better if you store all the resized images on persistent
storage so that you don't need to resize same image twice on a
handset.
[edited]
Some links about how to use persistence storage:
BlackBerry persistent store
Create a persistent data store
BlackBerry Java Application Development Guide
Sample Code Snippet for making a Bitmap object persistable:
class PersistableBitmap implements Persistable {
int width;
int height;
int[] argbData;
public PersistableBitmap(Bitmap image) {
width = image.getWidth();
height = image.getHeight();
argbData = new int[width * height];
image.getARGB(argbData, 0, width, 0, 0, width, height);
}
public Bitmap getBitmapImage() {
Bitmap image = new Bitmap(width, height);
image.setARGB(argbData, 0, width, 0, 0, width, height);
return image;
}
}