Question

I am developing a live wallpaper that reproduces an animation (like a short video) on background.

Does anyone know how to efficiently load various full screen size bitmaps and draw them on canvas?
I have tried 2 approaches and both are not very good.

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Approach #1:
Load all bitmaps on wallpaper startup.

Problem: Memory excess limit (about 35MB) cant load more than 10 bitmaps. So animations lack of different images.

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Approach #2:
Load only 2 bitmaps. On run time, paint bitmap, delete old bitmap, load new bitmap, repeat.

Problem: Consumes a lot of the system, (not memory, but slows down os in general), however it works because it doesn’t exceed memory limit. But still, slows down the entire system.

example:

  Drawer.drawAll(res,c,p);
  res.removeOldBitmaps();
  res.loadNewBitmaps(wpservice,display);

A different approach i thought about is load resource on a separete thread, what do you guys think of that? do you have any other solutions?

Cheers!

Answer 1

Solved, the solution I found was the following:

Load images on runtime, 1 by 1.

And use this options:

/**Effective image decoder by chelin**/
public static Bitmap decodeResource(WallpaperService wpservice,int id){

    int scale=1;
    Resources res = wpservice.getResources();
    BitmapFactory.Options o2 = new BitmapFactory.Options();
    o2.inPreferredConfig = Bitmap.Config.ARGB_8888;
    o2.inSampleSize=scale;
    o2.inPurgeable = true;
    o2.inInputShareable = true;
    return BitmapFactory.decodeResource(res, id, o2);
}

Hope it works as it worked for me. Cheers!