Categories: Java | Java ME | How To | Code Examples | Graphics

This page was last modified 09:37, 27 November 2007.

From Forum Nokia Wiki

Create a thumbnail image from a large image or scale an image in Java ME

private Image createThumbnail(Image image) {
  int sourceWidth = image.getWidth();
  int sourceHeight = image.getHeight();
  
  int thumbWidth = 64;
  int thumbHeight = -1;
  
  if (thumbHeight == -1)
    thumbHeight = thumbWidth * sourceHeight / sourceWidth;
  
  Image thumb = Image.createImage(thumbWidth, thumbHeight);
  Graphics g = thumb.getGraphics();
  
  for (int y = 0; y < thumbHeight; y++) {
    for (int x = 0; x < thumbWidth; x++) {
      g.setClip(x, y, 1, 1);
      int dx = x * sourceWidth / thumbWidth;
      int dy = y * sourceHeight / thumbHeight;
      g.drawImage(image, x - dx, y - dy,
          Graphics.LEFT | Graphics.TOP);
    }
  }
  
  Image immutableThumb = Image.createImage(thumb);
  
  return immutableThumb;
}

You may also use http://www.java-tips.org/java-me-tips/midp/how-to-implement-oom-in-and-oom-out.html

If you are using S60 devices, you can load the thumbnails generated automatically by the Gallery application. They are located in the "_PAlbTN" sub-folders of Image.

For more details on this, check Thumbnail_path_for_3rd_edition_devices.