bmThumbnail = ThumbnailUtils.createVideoThumbnail(
                    (db_results.get(position)), Thumbnails.MICRO_KIND);
            imageThumbnail.setImageBitmap(bmThumbnail);

The method createVideoThumbnail(String, int) in the type ThumbnailUtils is not applicable for the arguments (Uri, int)

public String getRealPathFromURI(Uri contentUri) {
    String[] proj = { MediaStore.Images.Media.DATA };
    Cursor cursor = managedQuery(contentUri, proj, null, null, null);
    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    return cursor.getString(column_index);
}