비트맵 파일로 떨어트리기

String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/Download");
myDir.mkdirs();

String fname = "image.jpg";

File file = new File (myDir, fname);
if (file.exists ()) file.delete ();
try {
  FileOutputStream out = new FileOutputStream(file);
  bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);
  out.flush();
  out.close();

  Toast.makeText(mContext, fname + "다운로드 되었습니다", Toast.LENGTH_SHORT).show();

} catch (Exception e) {
  e.printStackTrace();
}