CreatReport.java

 private void createPaymentReport(  List<Constants> paymentUsersList) throws DocumentException, FileNotFoundException{
        BaseColor colorWhite = WebColors.getRGBColor("#ffffff");
        BaseColor colorBlue = WebColors.getRGBColor("#056FAA");
        BaseColor grayColor = WebColors.getRGBColor("#425066");



        Font white = new Font(Font.FontFamily.HELVETICA, 15.0f, Font.BOLD, colorWhite);
        FileOutputStream output = new FileOutputStream(pFile);
        Document document = new Document(PageSize.A4);
        PdfPTable table = new PdfPTable(new float[]{6, 25, 20, 20});
        table.getDefaultCell().setHorizontalAlignment(Element.ALIGN_CENTER);
        table.getDefaultCell().setFixedHeight(50);
        table.setTotalWidth(PageSize.A4.getWidth());
        table.setWidthPercentage(100);
        table.getDefaultCell().setVerticalAlignment(Element.ALIGN_MIDDLE);

        Chunk noText = new Chunk("No.", white);
        PdfPCell noCell = new PdfPCell(new Phrase(noText));
        noCell.setFixedHeight(50);
        noCell.setHorizontalAlignment(Element.ALIGN_CENTER);
        noCell.setVerticalAlignment(Element.ALIGN_CENTER);

        Chunk nameText = new Chunk("First Name", white);
        PdfPCell nameCell = new PdfPCell(new Phrase(nameText));
        nameCell.setFixedHeight(50);
        nameCell.setHorizontalAlignment(Element.ALIGN_CENTER);
        nameCell.setVerticalAlignment(Element.ALIGN_CENTER);

        Chunk phoneText = new Chunk("Other Names", white);
        PdfPCell phoneCell = new PdfPCell(new Phrase(phoneText));
        phoneCell.setFixedHeight(50);
        phoneCell.setHorizontalAlignment(Element.ALIGN_CENTER);
        phoneCell.setVerticalAlignment(Element.ALIGN_CENTER);

        Chunk amountText = new Chunk("Phone Number", white);
        PdfPCell amountCell = new PdfPCell(new Phrase(amountText));
        amountCell.setFixedHeight(50);
        amountCell.setHorizontalAlignment(Element.ALIGN_CENTER);
        amountCell.setVerticalAlignment(Element.ALIGN_CENTER);


        Chunk footerText = new Chunk("Moses Njoroge - Copyright @ 2020");
        PdfPCell footCell = new PdfPCell(new Phrase(footerText));
        footCell.setFixedHeight(70);
        footCell.setHorizontalAlignment(Element.ALIGN_CENTER);
        footCell.setVerticalAlignment(Element.ALIGN_CENTER);
        footCell.setColspan(4);


        table.addCell(noCell);
        table.addCell(nameCell);
        table.addCell(phoneCell);
        table.addCell(amountCell);
        table.setHeaderRows(1);

        PdfPCell[] cells = table.getRow(0).getCells();


        for (PdfPCell cell : cells) {
            cell.setBackgroundColor(grayColor);
        }
        for (int i = 0; i < paymentUsersList.size(); i++) {
            Constants pay = paymentUsersList.get(i);

            String id = String.valueOf(i + 1);
            String name = pay.getFirst_Name();
            String sname = pay.getOther_Name();
            String phone = pay.getPhone();


            table.addCell(id + ". ");
            table.addCell(name);
            table.addCell(sname);
            table.addCell(phone);

        }

        PdfPTable footTable = new PdfPTable(new float[]{6, 25, 20, 20});
        footTable.setTotalWidth(PageSize.A4.getWidth());
        footTable.setWidthPercentage(100);
        footTable.addCell(footCell);

        PdfWriter.getInstance(document, output);
        document.open();
        Font g = new Font(Font.FontFamily.HELVETICA, 25.0f, Font.NORMAL, grayColor);
        document.add(new Paragraph(" How to generate real-time reports using Firebase\n\n", g));
        document.add(table);
        document.add(footTable);

        document.close();
    }