Add support to read from directories other the files dir

            Slog.v(TAG,

                    "onGetReadOnlyFileDescriptor: " + fileName + " under internal app storage.");

            File f = new File(getBaseContext().getFilesDir(), fileName);

            if (!f.exists()) {

                f = new File(fileName);

            }

            ParcelFileDescriptor pfd = null;

            try {

                pfd = ParcelFileDescriptor.open(f, ParcelFileDescriptor.MODE_READ_ONLY);

                Slog.d(TAG, "Successfully opened a file with ParcelFileDescriptor.");

            } catch (FileNotFoundException e) {

                Slog.e(TAG, "Cannot open file. No ParcelFileDescriptor returned.");

                future.completeExceptionally(e);

            } finally {

                future.complete(pfd);

                if (pfd != null) {