我能够连接xmpp for gtalk，但我不知道如何联系xmpp进行Facebook聊天，我搜索了很多，然后我写了一些代码，它也没有用，
现在我正在尝试这样，用户需要输入他的用户ID和密码，然后用户必须输入他的朋友用户名和消息，然后聊天。
XMPPClient.java
public class XMPPClient extends Activity {
private ArrayList<String> messages = new ArrayList();
private Handler mHandler = new Handler();
private SettingsDialog mDialog;
private EditText mRecipient;
private EditText mSendText;
private ListView mList;
private XMPPConnection connection;
/**
* Called with the activity is first created.
*/
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
Log.i("XMPPClient", "onCreate called");
setContentView(R.layout.main);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
mRecipient = (EditText) this.findViewById(R.id.recipient);
Log.i("XMPPClient", "mRecipient = " + mRecipient);
mSendText = (EditText) this.findViewById(R.id.sendText);
Log.i("XMPPClient", "mSendText = " + mSendText);
mList = (ListView) this.findViewById(R.id.listMessages);
Log.i("XMPPClient", "mList = " + mList);
setListAdapter();
// Dialog for getting the xmpp settings
mDialog = new SettingsDialog(this);
// Set a listener to show the settings dialog
Button setup = (Button) this.findViewById(R.id.setup);
setup.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
mHandler.post(new Runnable() {
public void run()
{
mDialog.show();
}
});
}
});
// Set a listener to send a chat text message
Button send = (Button) this.findViewById(R.id.send);
send.setOnClickListener(new View.OnClickListener()
{
public void onClick(View view) {
String to = mRecipient.getText().toString();
String text = mSendText.getText().toString();
Log.i("XMPPClient", "Sending text [" + text + "] to [" + to + "]");
Message msg = new Message(to, Message.Type.chat);
msg.setBody(text);
connection.sendPacket(msg);
messages.add(connection.getUser() + ":");
messages.add(text);
setListAdapter();
}
});
}
/**
* Called by Settings dialog when a connection is establised with the XMPP server
*
* @param connection
*/
public void setConnection
(XMPPConnection
connection) {
this.connection = connection;
if (connection != null) {
// Add a packet listener to get messages sent to us
PacketFilter filter = new MessageTypeFilter(Message.Type.chat);
connection.addPacketListener(new PacketListener() {
public void processPacket(Packet packet) {
Message message = (Message) packet;
if (message.getBody() != null) {
String fromName = StringUtils.parseBareAddress(message.getFrom());
Log.i("XMPPClient", "Got text [" + message.getBody() + "] from [" + fromName + "]");
messages.add(fromName + ":");
messages.add(message.getBody());
// Add the incoming message to the list view
mHandler.post(new Runnable() {
public void run() {
setListAdapter();
}
});
}
}
}, filter);
}
}
private void setListAdapter
() {
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
R.layout.multi_line_list_item,
messages);
mList.setAdapter(adapter);
}
}
settings.java
public class SettingsDialog extends Dialog implements android.view.View.OnClickListener {
private XMPPClient xmppClient;
public SettingsDialog(XMPPClient xmppClient) {
super(xmppClient);
this.xmppClient = xmppClient;
}
protected void onStart() {
super.onStart();
setContentView(R.layout.settings);
getWindow().setFlags(4, 4);
setTitle("XMPP Settings");
Button ok = (Button) findViewById(R.id.ok);
ok.setOnClickListener(this);
}
public void onClick(View v) {
String host = getText(R.id.host);
String port = getText(R.id.port);
String service = getText(R.id.service);
String username = getText(R.id.userid);
String password = getText(R.id.password);
//GTalk...Host name : talk.google.com The port number is 5222 service name : gmail.com
//Yahoo...Host name : iopibm.msg.yahoo.com The default port is 5061 service name : yahoo.com
//Facebook Hostname : chat.facebook.com The port number is 5222 service = chat.facebook.com for authentication SASLAuthentication.supportSASLMechanism("PLAIN", 0);
ConnectionConfiguration config = new ConnectionConfiguration("chat.facebook.com", 5222);
config.setSASLAuthenticationEnabled(true);
XMPPConnection xmpp = new XMPPConnection(config);
try
{
SASLAuthentication.registerSASLMechanism("X-FACEBOOK-PLATFORM", SASLXFacebookPlatformMechanism.class);
SASLAuthentication.supportSASLMechanism("X-FACEBOOK-PLATFORM", 0);
xmpp.connect();
xmpp.login("268651109963113", "268651109963113|zq84UUmSj7vh_I8oj7yfGLebKgY", "Application");
} catch (XMPPException e)
{
xmpp.disconnect();
e.printStackTrace();
}
}
private String getText(int id) {
EditText widget = (EditText) this.findViewById(id);
return widget.getText().toString();
}
}
SASLXFacebookPlatformMechanism .java
public class SASLXFacebookPlatformMechanism extends SASLMechanism {
private static final String NAME = "X-FACEBOOK-PLATFORM";
private String apiKey = "268651109963113";
private String access_token = "268651109963113|zq84UUmSj7vh_I8oj7yfGLebKgY";
/**
* Constructor.
*/
public SASLXFacebookPlatformMechanism(SASLAuthentication saslAuthentication) {
super(saslAuthentication);
}
@Override
protected void authenticate() throws IOException, XMPPException {
getSASLAuthentication().send(new AuthMechanism(NAME, ""));
}
@Override
public void authenticate(String apiKey, String host, String acces_token)
throws IOException, XMPPException {
if (apiKey == null || acces_token == null) {
throw new IllegalArgumentException("Invalid parameters");
}
this.access_token = acces_token;
this.apiKey = apiKey;
this.hostname = host;
String[] mechanisms = { NAME };
Map<String, String> props = new HashMap<String, String>();
this.sc = Sasl.createSaslClient(mechanisms, null, "xmpp", host, props,
this);
authenticate();
}
@Override
public void authenticate(String username, String host, CallbackHandler cbh)
throws IOException, XMPPException {
String[] mechanisms = { NAME };
Map<String, String> props = new HashMap<String, String>();
this.sc = Sasl.createSaslClient(mechanisms, null, "xmpp", host, props,
cbh);
authenticate();
}
@Override
protected String getName() {
return NAME;
}
@Override
public void challengeReceived(String challenge) throws IOException {
byte[] response = null;
if (challenge != null) {
String decodedChallenge = new String(Base64.decode(challenge));
Map<String, String> parameters = getQueryMap(decodedChallenge);
String version = "1.0";
String nonce = parameters.get("nonce");
String method = parameters.get("method");
long callId = new GregorianCalendar().getTimeInMillis();
String composedResponse = "api_key="
+ URLEncoder.encode(apiKey, "utf-8") + "&call_id=" + callId
+ "&method=" + URLEncoder.encode(method, "utf-8")
+ "&nonce=" + URLEncoder.encode(nonce, "utf-8")
+ "&access_token="
+ URLEncoder.encode(access_token, "utf-8") + "&v="
+ URLEncoder.encode(version, "utf-8");
response = composedResponse.getBytes("utf-8");
}
String authenticationText = "";
if (response != null) {
authenticationText = Base64.encodeBytes(response,
Base64.DONT_BREAK_LINES);
}
// Send the authentication to the server
getSASLAuthentication().send(new Response(authenticationText));
}
private Map<String, String> getQueryMap(String query) {
Map<String, String> map = new HashMap<String, String>();
String[] params = query.split("\\&");
for (String param : params) {
String[] fields = param.split("=", 2);
map.put(fields[0], (fields.length > 1 ? fields[1] : null));
}
return map;
}
}
现在我的更新代码在这些行中抛出NPE
Message msg = new Message(to, Message.Type.chat);
msg.setBody(text);
connection.sendPacket(msg);
首先它将打开对话框，我们需要输入userid和pwd，然后想要输入朋友列表的用户名然后输入msg然后点击发送这样我正在尝试,,,我正在输入用户也正确命名，但在点击发送按钮时显示NUll ponter异常
答案 0 :(得分：1)
我认为问题可能是你有两个包含相同包和类的jar文件。因此，我强烈建议您再次检查所有jar文件并删除导致问题的任何人。
从其中一个JAR文件中删除此包将解决问题。
答案 1 :(得分：0)
在实施聊天客户端时需要遵循一个官方Facebook Chat API documentation - 对您需要的用户进行身份验证，向他展示WebView表单，在Facebook上对Facebook上的应用程序进行身份验证，获取身份验证令牌，以及 令牌将用于X-FACEBOOK-PLATFORM SASL机制。