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how do i edit HTML inside string JAVA CODE easily

i developed android app and i used HTML code to Print the result in formatted form.
the code will be like this :
String adress = editText1.getText().toString();
String phone = editText2.getText().toString();
String licenseNo = editText3.getText().toString();
"\n" +
" <div class=\"down\">\n" +
" <div class=\"EASY\">\n" +
" <img src=\"" + image + "\" alt=\"QR\" >\n" +
" </div>\n" +
" <table class=\" info_table\">\n" +
" <tbody>\n" +
" <tr>\n" +
" <td class=\"info\">" + phone + "</td>\n" +
" <td class=\"info\"> " + licenseNo + "</td>\n" +
" </tr>\n" +
" <tr>\n" +
" <td class=\"info_A\" colspan=\"2\"> " + adress + "</td>\n" +
" </tr>\n" +
" </tbody>\n" +
" </table>\n" +
" </div>";
as you see it should contain \n and + because its inside a string object contained variable values from user input.
i faced some difficulty when i need to Edit this Piece of code cose i will test it inside the application.
my question is what is the best way to get this code to edit and preview it outside android studio and reinsert it again.
i used find and replace but it make some problems.
hope i explained enough

You can create a XML file in the resources folder, read it and then use format in order to change the values there.

cannot find symbol method append (String)

I don't get it why it says it cannot find symbol append.
do i need to use Stringbuffer? i got this code on a tutorial for receipts from youtube, and the uploader disabled comments so I can't ask him directly. please help me. Im still an amateur at java.
Tell me if I need to post my whole code or what code would you want to see to see errors. thanks in adv.
Calendar timer = Calendar.getInstance();
timer.getTime();
SimpleDateFormat tTime = new SimpleDateFormat("HH:mm:ss");
tTime.format(timer.getTime());
SimpleDateFormat Tdate = new SimpleDateFormat("dd-MMM-yyyy");
Tdate.format(timer.getTime());
jtxtReceipt.append("\ Water Station Receipt:\n" +
"Reference:\t\t\t" + refs +
"\n=========================================\n" +
"Mineral:\t\t\t" + jtxtMineral.getText() + "\n\n" +
"Purified:\t\t\t" + jtxtPurified.getText() + "\n\n" +
"Travel:\t\t\t" + jtxtTravel.getText() + "\n\n" +
"VAT:\t\t\t" + jtxtVat.getText() + "\n"+
"\n========================================\n" + "\n" +
"Tax:\t\t\t" + jtxtTax2.getText() + "\n" +
"Subtotal:\t\t\t" + jtxtSubTotal.getText() + "\n" +
"Total:\t\t\t" + jtxtTotal.getText() + "\n" +
"===========================================" +
"\nDate:" + Tdate.format(timer.getTime()) +
"\ntTime:" + tTime.format(timer.getTime()) +
"\n\t\tThank you ");

The append method doesn't exist in the String class. You can either user a StringBuilder to do the job, or if it's a light concatenation, just use the + operator

The append method doesn't work on TextField Palette. So, if You're on TextField Palette, replacing that with TextArea Palette should solve the problem.

How can I add a newline character to a String in Java?

In a Java application, I am creating a String like below (by concatenation):
String notaCorrente = dataOdierna + " - " + testoNotaCorrente;
My problem is that I want to add also something like an HTML newline character at the end of this String (that will be shown into an HTML page).
How can I implement it?

The newline character in Java is "\n" which will look like this:
String notaCorrente = dataOdierna + " - " + testoNotaCorrente + "\n";
However, this will not display as you expect on your HTML page. You can try adding an html break tag, or add the
(Line Feed) and 
 (Carriage Return) HTML entities:
String notaCorrente = dataOdierna + " - " + testoNotaCorrente + "<br>";
or
String notaCorrente = dataOdierna + " - " + testoNotaCorrente + "
&#10";

For a newline that will result in a line break in HTML, use
String notaCorrente = dataOdierna + " - " + testoNotaCorrente + "<br>";
For a newline that will result in a line break in your text editor, use
String notaCorrente = dataOdierna + " - " + testoNotaCorrente + System.lineSeparator();
And for both, use
String notaCorrente = dataOdierna + " - " + testoNotaCorrente + "<br>" + System.lineSeparator();
Why not \n?
\n is specific to certain operating systems, while others use \r\n. System.lineSeparator() will get you the one that is relevant to the system where you are executing your application. See the documentation for more info on this function, and Wikipedia for more info on newlines in general.

Simply, need to add <br/> (break line tag of HTML).
String notaCorrente = dataOdierna + " - " + testoNotaCorrente + "<br/>";
so, while you are going to display this content, <br/> tag will rendered on HTML page in form of new line.

How can I split the data over multiple lines in a JTextArea?

How can I put each line of the host in the message body? I work with a JTextArea.
String host = InetAddress.getLocalHost().getHostName().toString();
texto_recepcion.setText(host + texto_recepcion.getText() + dpRecepcion.getAddress() + " " + mensaje_recibido + "\n");
How it is now:

I resolve my question with append function.
String host = InetAddress.getLocalHost().getHostName().toString();
texto_recepcion.append(host); // ***Use the function append for solve the problem***
texto_recepcion.setText(texto_recepcion.getText() + dpRecepcion.getAddress() + " " + mensaje_recibido + "\n");
Thanks a lot

Why don't you add the newline character "\n" to the beginning of the string?
texto_recepcion.setText("\n" + host + texto_recepcion.getText() + dpRecepcion.getAddress() + " " + mensaje_recibido);

Meeting request timing mismatch with full VS lite outlook version

I am creating meeting request with java code and sending it to full as well as lite version of outlook as shown below:
final SimpleDateFormat iCalendarDateFormat = new SimpleDateFormat("yyyyMMdd'T'HHmm'00'");
final long uid =System.currentTimeMillis();
iCalendarDateFormat.setTimeZone(TimeZone.getTimeZone(MRBSConstants.TIMEZONE));
final String calendarContent = "BEGIN:VCALENDAR\n"
+ "METHOD:REQUEST\n"
+ "PRODID: BCP - Meeting\n"
+ "VERSION:2.0\n"
+ "BEGIN:VEVENT\n"
+ "DTSTAMP:"+ iCalendarDateFormat.format(meetingEndTime) + "\n"
+ "DTSTART:" + iCalendarDateFormat.format(meetingStartTime) + "\n"
+ "DTEND:"+ iCalendarDateFormat.format(meetingEndTime) + "\n"
+ "SUMMARY:test request\n"
+ "UID:" + uid + "\n"
+ "ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE:MAILTO:" + Arrays.toString(recipetList) + "\n"
+ "ORGANIZER:MAILTO:" + from+ "\n"
+ "LOCATION:" +loc + "\n"
+ "DESCRIPTION:" + body+ "\n"
+ "SEQUENCE:0\n" + "PRIORITY:5\n" + "CLASS:PUBLIC\n" + "STATUS:CONFIRMED\n" + "TRANSP:OPAQUE\n" + "BEGIN:VALARM\n"
+ "ACTION:DISPLAY\n" + "DESCRIPTION:REMINDER\n" + "TRIGGER;RELATED=START:-PT00H15M00S\n" + "END:VALARM\n" + "END:VEVENT\n" + "END:VCALENDAR";
And it is working fine with lite version of outlook means it giving correct time in lite version but in full version of outlook it showing different timings.?why
Here MRBSConstants.TIMEZONE value is GMT-5:30.
I have also tried adding VTIMEZONE COMPONENT but in that case outlook cant recognize the ics file as correct.
Do we have any general ics object which can work on both version?