在android中生成pdf

Question

我正在尝试将android活动转换为pdf文件，以便它可以作为邮件发送。这是我试过的代码..我无法获得pdf !!! Plz帮助..

 public void createPdf() throws FileNotFoundException, DocumentException {
    String dir = Environment.getExternalStorageDirectory() + File.separator + "myLogs";
    File folder = new File(dir);
    folder.mkdirs();

    DatabaseHandler  dbHandler = new DatabaseHandler(this);
    File file = new File(dir, "Facility_data.pdf");
    SQLiteDatabase database = dbHandler.getReadableDatabase();

    Cursor c1 = database.rawQuery("SELECT * FROM " + DatabaseHandler.TABLE_NAME, null);
    Document document = new Document();  // create the document
    PdfWriter.getInstance(document, new FileOutputStream(file));
    document.open();
    Paragraph p3 = new Paragraph();
    p3.add("Username :");
    document.add(p3);

    PdfPTable table = new PdfPTable(2);
    table.addCell("NAME :");
    table.addCell("REP :");

    while (c1.moveToNext()) {

        String user_name = c1.getString(1);
        String rep_name = c1.getString(2);

       /* String date = c1.getString(3);
        String start = c1.getString(1);
        String end = c1.getString(2);
        String total = c1.getString(4);*/

        table.addCell(user_name);
        table.addCell(rep_name);
        //table.addCell(end);
        //table.addCell(total);
    }

    document.add(table);
    document.addCreationDate();
    document.close();
}