// write the document content
        String targetPdf = "/sdcard/pdffromlayout.pdf";
        File filePath;
        filePath = new File(targetPdf);
        try {
            document.writeTo(new FileOutputStream(filePath));

         } catch (IOException e) {
            e.printStackTrace();
            Toast.makeText(this, "Something wrong: " + e.toString(), Toast.LENGTH_LONG).show();
        }

        // close the document
        document.close();
        Toast.makeText(this, "PDF is created!!!", Toast.LENGTH_SHORT).show();

        openGeneratedPDF();

    }

    private void openGeneratedPDF(){
        File file = new File("/sdcard/pdffromlayout.pdf");
        if (file.exists())
        {
            Intent intent=new Intent(Intent.ACTION_VIEW);
            Uri uri = Uri.fromFile(file);
            intent.setDataAndType(uri, "application/pdf");
            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

            try
            {
                startActivity(intent);
            }
            catch(ActivityNotFoundException e)
            {
                Toast.makeText(MainActivity.this, "No Application available to view pdf", Toast.LENGTH_LONG).show();
            }
        }
    }