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