mirror of
https://github.com/vanitasvitae/Smack.git
synced 2024-11-18 10:02:05 +01:00
205 lines
6.8 KiB
Markdown
205 lines
6.8 KiB
Markdown
XHTML Messages
|
|
==============
|
|
|
|
[Back](index.md)
|
|
|
|
Provides the ability to send and receive formatted messages using XHTML.
|
|
|
|
Follow these links to learn how to compose, send, receive and discover support
|
|
for XHTML messages:
|
|
|
|
* Compose an XHTML Message
|
|
* Send an XHTML Message
|
|
* Receive an XHTML Message
|
|
* Discover support for XHTML Messages
|
|
|
|
**XEP related:** [XEP-71](http://www.xmpp.org/extensions/xep-0071.html)
|
|
|
|
Compose an XHTML Message
|
|
------------------------
|
|
|
|
**Description**
|
|
|
|
The first step in order to send an XHTML message is to compose it. Smack
|
|
provides a special class that helps to build valid XHTML messages hiding any
|
|
low level complexity. For special situations, advanced users may decide not to
|
|
use the helper class and generate the XHTML by themselves. Even for these
|
|
situations Smack provides a well defined entry point in order to add the
|
|
generated XHTML content to a given message.
|
|
|
|
Note: not all clients are able to view XHTML formatted messages. Therefore,
|
|
it's recommended that you include a normal body in that message that is either
|
|
an unformatted version of the text or a note that XHTML support is required to
|
|
view the message contents.
|
|
|
|
**Usage**
|
|
|
|
Create an instance of _**XHTMLText**_ specifying the style and language of the
|
|
body. You can add several XHTML bodies to the message but each body should be
|
|
for a different language. Once you have an XHTMLText you can start to append
|
|
tags and text to it. In order to append tags there are several messages that
|
|
you can use. For each XHTML defined tag there is a message that you can send.
|
|
In order to add text you can send the message **#append(String
|
|
textToAppend)**.
|
|
|
|
After you have configured the XHTML text, the last step you have to do is to
|
|
add the XHTML text to the message you want to send. If you decided to create
|
|
the XHTML text by yourself, you will have to follow this last step too. In
|
|
order to add the XHTML text to the message send the message **#addBody(Message
|
|
message, String body)** to the _**XHTMLManager**_ class where _message_ is the
|
|
message that will receive the XHTML body and _body_ is the string to add as an
|
|
XHTML body to the message.**
|
|
|
|
**Example**
|
|
|
|
In this example we can see how to compose the following XHTML message:
|
|
|
|
```
|
|
<body>
|
|
<p style='font-size:large'>Hey John, this is my new
|
|
<span style='color:green'>green</span>
|
|
<em>!!!!</em>
|
|
</p>
|
|
</body>
|
|
```
|
|
|
|
```
|
|
// Create a message to send
|
|
Message msg = chat.createMessage();
|
|
msg.setSubject("Any subject you want");
|
|
msg.setBody("Hey John, this is my new green!!!!");
|
|
|
|
// Create an XHTMLText to send with the message
|
|
XHTMLText xhtmlText = new XHTMLText(null, null);
|
|
xhtmlText.appendOpenParagraphTag("font-size:large");
|
|
xhtmlText.append("Hey John, this is my new ");
|
|
xhtmlText.appendOpenSpanTag("color:green");
|
|
xhtmlText.append("green");
|
|
xhtmlText.appendCloseSpanTag();
|
|
xhtmlText.appendOpenEmTag();
|
|
xhtmlText.append("!!!!");
|
|
xhtmlText.appendCloseEmTag();
|
|
xhtmlText.appendCloseParagraphTag();
|
|
xhtmlText.appendCloseBodyTag();
|
|
|
|
// Add the XHTML text to the message
|
|
XHTMLManager.addBody(msg, xhtmlText);
|
|
```
|
|
|
|
Send an XHTML Message
|
|
---------------------
|
|
|
|
**Description**
|
|
|
|
After you have composed an XHTML message you will want to send it. Once you
|
|
have added the XHTML content to the message you want to send you are almost
|
|
done. The last step is to send the message as you do with any other message.
|
|
|
|
**Usage**
|
|
|
|
An XHTML message is like any regular message, therefore to send the message
|
|
you can follow the usual steps you do in order to send a message. For example,
|
|
to send a message as part of a chat just use the message **#sendMessage(Message)** of
|
|
_**Chat**_ or you can use the message **#sendStanza(Stanza)** of
|
|
_**XMPPConnection**_.
|
|
|
|
**Example**
|
|
|
|
In this example we can see how to send a message with XHTML content as part of
|
|
a chat.
|
|
|
|
```
|
|
// Create a message to send
|
|
Message msg = chat.createMessage();
|
|
// Obtain the XHTML text to send from somewhere
|
|
XHTMLText xhtmlBody = getXHTMLTextToSend();
|
|
|
|
// Add the XHTML text to the message
|
|
XHTMLManager.addBody(msg, xhtmlBody);
|
|
|
|
// Send the message that contains the XHTML
|
|
chat.sendMessage(msg);
|
|
```
|
|
|
|
Receive an XHTML Message
|
|
------------------------
|
|
|
|
**Description**
|
|
|
|
It is also possible to obtain the XHTML content from a received message.
|
|
Remember that the specification defines that a message may contain several
|
|
XHTML bodies where each body should be for a different language.
|
|
|
|
**Usage**
|
|
|
|
To get the XHTML bodies of a given message just send the message
|
|
**#getBodies(Message)** to the class _**XHTMLManager**_. The answer of this
|
|
message will be an _**List**_ with the different XHTML bodies of the
|
|
message or null if none.
|
|
|
|
**Example**
|
|
|
|
In this example we can see how to create a PacketListener that obtains the
|
|
XHTML bodies of any received message.
|
|
|
|
```
|
|
// Create a listener for the chat and display any XHTML content
|
|
IncomingChatMessageListener listener = new IncomingChatMessageListener() {
|
|
public void newIncomingMessage(EntityBareJid from, Message message, Chat chat) {
|
|
// Obtain the XHTML bodies of the message
|
|
List<CharSequence> bodies = XHTMLManager.getBodies(message);
|
|
if (bodies == null) {
|
|
return;
|
|
|
|
// Display the bodies on the console
|
|
for (CharSequence body : bodies) {
|
|
System.out.println(body);
|
|
}
|
|
}
|
|
};
|
|
chatManager.addListener(listener);
|
|
```
|
|
|
|
Discover support for XHTML Messages
|
|
-----------------------------------
|
|
|
|
**Description**
|
|
|
|
Before you start to send XHTML messages to a user you should discover if the
|
|
user supports XHTML messages. There are two ways to achieve the discovery,
|
|
explicitly and implicitly. Explicit is when you first try to discover if the
|
|
user supports XHTML before sending any XHTML message. Implicit is when you
|
|
send XHTML messages without first discovering if the conversation partner's
|
|
client supports XHTML and depenging on the answer (normal message or XHTML
|
|
message) you find out if the user supports XHTML messages or not. This section
|
|
explains how to explicitly discover for XHTML support.
|
|
|
|
**Usage**
|
|
|
|
In order to discover if a remote user supports XHTML messages send
|
|
**#isServiceEnabled(XMPPConnection connection, String userID)** to the class
|
|
_**XHTMLManager**_ where connection is the connection to use to perform the
|
|
service discovery and userID is the user to check (A fully qualified xmpp ID,
|
|
e.g. jdoe@example.com). This message will return true if the specified user
|
|
handles XHTML messages.
|
|
|
|
**Example**
|
|
|
|
In this example we can see how to discover if a remote user supports XHTML
|
|
Messages.
|
|
|
|
```
|
|
Message msg = chat.createMessage();
|
|
// Include a normal body in the message
|
|
msg.setBody(getTextToSend());
|
|
// Check if the other user supports XHTML messages
|
|
if (XHTMLManager.isServiceEnabled(connection, chat.getParticipant())) {
|
|
// Obtain the XHTML text to send from somewhere
|
|
String xhtmlBody = getXHTMLTextToSend();
|
|
// Include an XHTML body in the message
|
|
qHTMLManager.addBody(msg, xhtmlBody);
|
|
}
|
|
|
|
// Send the message
|
|
chat.sendMessage(msg);
|
|
```
|