fetching images from gallery on android phones with internal storage

    File root = new File("/sdcard/MyCollection");
    final String files[] = root.list(imageFilter);
    FilenameFilter imageFilter = new FilenameFilter() {
        File f;
        public boolean accept(File dir, String name) {
        if(name.endsWith(".jpg")) {
                return true;
            }
            f = new File(dir.getAbsolutePath()+"/"+name);

            return f.isDirectory();
        }
    };  

 public class ImageAdapter extends BaseAdapter {

    private ArrayList <String> data = new ArrayList();

    // I'm using a yamlReader to fill in the data, but it could instead just be hardcoded.
    fillDataWithImageNames();

    // create a new ImageView for each item referenced by the Adapter
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView;
        if (convertView == null) {
            // if it's not recycled, initialize some attributes
            imageView = new ImageView(mContext);
            imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            imageView.setPadding(8, 8, 8, 8);
        } else {
            imageView = (ImageView) convertView;
        }

        // The images are in /app/assets/images/thumbnails/example.jpeg
        imageView.setImageDrawable(loadThumb("images/thumbnails/" + data.get(position) + ".jpeg"));
        return imageView;
    }

    // references to our images
    private Drawable loadThumb(String path) {
    try {
        // get input stream
        InputStream ims = mContext.getAssets().open(path);
        // load image as Drawable
        Drawable d = Drawable.createFromStream(ims, null);
        // set image to ImageView
        return d;
    }
    catch(IOException ex) {
        return null;
    }
}