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

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;
    }
}