java - XMPP 和 Android 第 2 部分

Question

这个问题是我上一个问题的延续，尽管我已经设法删除了 NetworkOnMainThreadError，但现在我有新的错误需要解决，

上一个问题可以在这里找到:XMPP and ANDROID

这次我猜问题是我的主机名，或者可能是服务名，我正在尝试连接到 openFire 服务器。

顺便说一句，我需要将 public class SettingsDialog extends Dialog 添加到 Menifest 文件

我的连接代码:

/**
 * Gather the xmpp settings and create an XMPPConnection
 */
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) {

            new NetworkOperation().execute();
            dismiss();
        }

异步任务

public class NetworkOperation extends AsyncTask<String, Void, String> {

    private XMPPClient xmppClient;
    @Override
    protected String doInBackground(String... urls) {

        String host = "web.vlivetech.com"; //getText(R.id.host);
        String port = "5222";  //getText(R.id.port);
        String service = "web.vlivetech.com"; //getText(R.id.service);
        String username = "khubaib@web.vlivetech.com"; //getText(R.id.userid);
        String password = "khubaib"; //getText(R.id.password);

        // Create a connection
        ConnectionConfiguration connConfig =
                new ConnectionConfiguration(host, Integer.parseInt(port),service);
        XMPPConnection connection = new XMPPConnection(connConfig);

        try {
            connection.connect();
            Log.i("XMPPClient", "[SettingsDialog] Connected to " + connection.getHost());
        } catch (XMPPException ex) {
            Log.e("XMPPClient", "[SettingsDialog] Failed to connect to " + connection.getHost());
            xmppClient.setConnection(null);
        }
        try {
            connection.login(username, password);
            Log.i("XMPPClient", "Logged in as " + connection.getUser());

            // Set the status to available
            Presence presence = new Presence(Presence.Type.available);
            connection.sendPacket(presence);
            xmppClient.setConnection(connection);
        } catch (XMPPException ex) {
            Log.e("XMPPClient", "[SettingsDialog] Failed to log in as " + username);
            xmppClient.setConnection(null);
        }

      return null;
    }

    @Override
    protected void onPostExecute(String result) {

    }
  }

我在异步任务中遇到错误的行:

try {
            connection.connect();
            Log.i("XMPPClient", "[SettingsDialog] Connected to " + connection.getHost());
        } catch (XMPPException ex) {
            Log.e("XMPPClient", "[SettingsDialog] Failed to connect to " + connection.getHost());
            xmppClient.setConnection(null);
        }

日志文件

03-06 17:50:39.754: I/SmackConfiguration(16410): No configuration file found
03-06 17:50:39.764: E/XMPPClient(16410): [SettingsDialog] Failed to connect to null
03-06 17:50:39.764: W/dalvikvm(16410): threadid=11: thread exiting with uncaught exception (group=0x40aaa210)
03-06 17:50:39.774: E/AndroidRuntime(16410): FATAL EXCEPTION: AsyncTask #1
03-06 17:50:39.774: E/AndroidRuntime(16410): java.lang.RuntimeException: An error occured while executing doInBackground()
03-06 17:50:39.774: E/AndroidRuntime(16410):    at android.os.AsyncTask$3.done(AsyncTask.java:278)
03-06 17:50:39.774: E/AndroidRuntime(16410):    at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
03-06 17:50:39.774: E/AndroidRuntime(16410):    at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
03-06 17:50:39.774: E/AndroidRuntime(16410):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
03-06 17:50:39.774: E/AndroidRuntime(16410):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
03-06 17:50:39.774: E/AndroidRuntime(16410):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
03-06 17:50:39.774: E/AndroidRuntime(16410):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
03-06 17:50:39.774: E/AndroidRuntime(16410):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
03-06 17:50:39.774: E/AndroidRuntime(16410):    at java.lang.Thread.run(Thread.java:856)
03-06 17:50:39.774: E/AndroidRuntime(16410): Caused by: java.lang.NullPointerException
03-06 17:50:39.774: E/AndroidRuntime(16410):    at com.example.test.NetworkOperation.doInBackground(NetworkOperation.java:33)
03-06 17:50:39.774: E/AndroidRuntime(16410):    at com.example.test.NetworkOperation.doInBackground(NetworkOperation.java:1)
03-06 17:50:39.774: E/AndroidRuntime(16410):    at android.os.AsyncTask$2.call(AsyncTask.java:264)
03-06 17:50:39.774: E/AndroidRuntime(16410):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)

Answer 1

如果您的 NetworkOperation 位于您的 Activity 内，则从 NetworkOperation 中删除此行，或者您可能想要添加一个构造函数(?)，通过xmppClient 与 .execute()

private XMPPClient xmppClient;