String file_path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/MyFolder";
    File dir = new File(file_path);

    if(!dir.exists())
    {
        dir.mkdirs();
    }

    String name = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()).concat(".png");
    File file = new File(dir, name);

    FileOutputStream fOut;
    try {
        fOut = new FileOutputStream(file);
        bitmap.compress(Bitmap.CompressFormat.PNG, 85, fOut);
        fOut.flush();
        fOut.close();

        return Uri.fromFile(file);
    } catch (Exception e) {
        e.printStackTrace();
    }

    return null;