Android: Format string to html - add new lines [duplicate]

问题

I need to format text coming from user to HTML, but the input is multiple line and I have to replace all "enters" from that string to HTML <br /> tags.

String message = messageEditText.getText().toString();

This is the message I want to format. How can I format the string accordingly?

回答1:

try

message = message.replace ("\\r\\n", "<br>").replace ("\\n", "<br>");

回答2:

You can use the double replacement as already suggested in other responses, but I would tend to prefer regex replacement, for concision of code:

yourString.replaceAll("\r?\n", "<br/>");

Or, of course Pattern equivalent, if you need to do the operation multiple times:

Pattern endOfLine = Pattern.compile("\r?\n");
endOfLine.matcher(yourString).replaceAll("<br/>");

Also, be careful with using System's line separator if user's input has been acquired from a web interface, or a remote system (depending on your use case, of course). User may use a different OS...

However, in all cases, make sure you do any EOL -> <br/> replacement, AFTER you have HTML-encoded any special characters in the user's input. Otherwise, the <br> tag will get encoded...

回答3:

According to your operating system, the string will have newline character/s at the end of each line. Those can be \n or \r\n. Just write:

inputString = inputString.replace("\r\n", "<br />").replace("\n", "<br />");

By this, if the current operating system uses \r\n those will be replaced within the first replacement, else if it's \n, they won't be found in first replacement, but will be replaced within the second one.

If you want to write some cool code, you can use the following: