convert base64 to pdf object for pdf reader in android studio

1 case PDF:
2    try {
3        byte[] pdfAsBytes = Base64.decode(file.getContent(), Base64.DEFAULT);
4        File dir = getStorageDir();
5        File pdffile = new File(dir, file.getName());
6        if(!pdffile.exists())
7        {
8            pdffile.getParentFile().mkdirs();
9            pdffile.createNewFile();
10        }
11        Files.write(pdfAsBytes, pdffile);
12        Intent pdfIntent = new Intent(Intent.ACTION_VIEW);
13        pdfIntent.setDataAndType(Uri.fromFile(pdffile), "application/pdf");
14        pdfIntent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
15        startActivity(pdfIntent);
16    } catch (IOException e) {
17        e.printStackTrace();
18    }
19
20    break;
21