public boolean saveFileToDisk(String filedir, String savename) {
		boolean mark = false;
		FileOutputStream fos = null; // ļ
		try {
			java.io.File upfile = new java.io.File(filedir, savename);
			fos = new FileOutputStream(upfile);
			fos.write(parent.filecontent_b, start, (end - start) + 1);
			fos.close();
			mark = true;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return mark;
	}