爲什麼我的tableview沒有被更新？

Question

我正在使用smack和javafx開發chatclient。 所以我有一個tableview列出了登錄用戶的聯繫人，它實時獲取聯繫人的狀態，但是當它是時候更新tableview時，它不會這樣做（即使很難我的system.out .println表明它應該完成它）。奇怪的是它只在第一次加載tableview時加載數據。 這裏是我的代碼：

package login; 

import java.util.Collection; 
import java.util.Iterator; 

import org.jivesoftware.smack.Roster; 
import org.jivesoftware.smack.RosterEntry; 
import org.jivesoftware.smack.RosterGroup; 
import org.jivesoftware.smack.RosterListener; 
import org.jivesoftware.smack.XMPPConnection; 
import org.jivesoftware.smack.packet.Presence; 

import dto.RosterDTO; 
import javafx.beans.value.ChangeListener; 
import javafx.beans.value.ObservableValue; 
import javafx.collections.FXCollections; 
import javafx.collections.ListChangeListener; 
import javafx.collections.ObservableList; 
import javafx.event.*; 
import javafx.fxml.FXML; 
import javafx.scene.control.*; 
import javafx.scene.control.cell.PropertyValueFactory; 

/** Controls the main application screen */ 
public class MainViewController { 
    @FXML 
    private Button logoutButton; 
    @FXML 
    private Label sessionLabel; 

    @FXML 
    private TableView<RosterDTO> rosterTable; 
    @FXML 
    private TableColumn<RosterDTO, String> grupoColumn; 
    @FXML 
    private TableColumn<RosterDTO, String> usuarioColumn; 
    @FXML 
    private TableColumn<RosterDTO, String> estatusColumn; 

    ObservableList<RosterDTO> rosterList; 

    private LoginManager loginManager; 

    @FXML 
    private void initialize() { 
     // Initialize the person table 
     grupoColumn 
       .setCellValueFactory(new PropertyValueFactory<RosterDTO, String>(
         "grupo")); 
     usuarioColumn 
       .setCellValueFactory(new PropertyValueFactory<RosterDTO, String>(
         "usuario")); 
     estatusColumn 
     .setCellValueFactory(new PropertyValueFactory<RosterDTO, String>(
       "estatus"));   
     rosterTable.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY); 
    } 

    public void initSessionID(final LoginManager loginManager, String sessionID) { 
     this.loginManager = loginManager; 
     XMPPConnection connection = this.loginManager.getXmppManager().getConnection(); 
     Roster roster = connection.getRoster(); 
     Collection<RosterEntry> entries = roster.getEntries(); 
     Presence p = roster.getPresence("testUser1"); 
     System.out.println("Estatus: " + p.getStatus()); 
     System.out.println("\n\n" + entries.size() + " buddy(ies):"); 
     rosterList = FXCollections.observableArrayList(); 
     for (RosterEntry r : entries) { 
      RosterDTO rosterDTO = new RosterDTO(); 
      rosterDTO.setUsuario(r.getUser() + "/Smack"); 
      System.out.println("user: " + r.getUser()); 
      System.out.println(r.getName()); 
      System.out.println("group: " + r.getGroups()); 
      for (Iterator<?> i = r.getGroups().iterator(); i.hasNext();) { 
       RosterGroup rosterObject = (RosterGroup) i.next(); 
       rosterDTO.setGrupo(rosterObject.getName()); 
      } 
      rosterList.add(rosterDTO); 
     } 
     rosterTable.setItems(rosterList); 
     roster.addRosterListener(new RosterListener() { 
      public void entriesDeleted(Collection<String> addresses) { 
       System.out.println("deleted: " + addresses.size()); 
      } 

      public void entriesUpdated(Collection<String> addresses) { 
       System.out.println("updated: " + addresses.size()); 
      } 

      public void entriesAdded(Collection<String> addresses) { 
       System.out.println("added: " + addresses.size()); 
      } 

      public void presenceChanged(Presence presence) { 
       System.out.println("Presence changed: " + presence.getFrom() 
         + " " + presence + " " + presence.getStatus()); 
       System.out.println(presence.getProperty("key")); 
       rosterList.get(0).setUsuario(presence.getStatus()); 
       rosterList.get(0).setEstatus(presence.getStatus()); 
       //rosterTable.setUserData(rosterList); 
       rosterTable.layout(); 
       rosterTable.setItems(rosterList); 
      } 
     });  

    } 
} 

爲什麼加載數據的第一時間，但不得遲？ 我應該使用除了tableview以外的其他東西嗎？ 在此先感謝。

Answer 1

伊夫設法通過使用從我觀察的名單 「集」的方法來解決它，所以我離開了我的方法是這樣的：

public final void displayBuddyList(final TableView<RosterDTO> rosterTable) { 
     Roster roster = connection.getRoster(); 
     Collection<RosterEntry> entries = roster.getEntries(); 
     System.out.println("\n\n" + entries.size() + " buddy(ies):"); 
     final ObservableList<RosterDTO> rosterList = FXCollections.observableArrayList(); 
     for (RosterEntry r : entries) { 
      RosterDTO rosterDTO = new RosterDTO(); 
      rosterDTO.setUsuario(r.getUser() + "/Smack"); 
      System.out.println("user: " + r.getUser()); 
      System.out.println(r.getName()); 
      System.out.println("group: " + r.getGroups()); 
      for (Iterator<?> i = r.getGroups().iterator(); i.hasNext();) { 
       RosterGroup rosterObject = (RosterGroup) i.next(); 
       rosterDTO.setGrupo(rosterObject.getName()); 
      } 
      rosterList.add(rosterDTO); 
     } 
     rosterTable.setItems(rosterList); 
     roster.addRosterListener(new RosterListener() { 
      // Ignored events public void entriesAdded(Collection<String> 
      // addresses) {} 
      public void entriesDeleted(Collection<String> addresses) { 
       System.out.println("deleted: " + addresses.size()); 
      } 

      public void entriesUpdated(Collection<String> addresses) { 
       System.out.println("updated: " + addresses.size()); 
      } 

      public void entriesAdded(Collection<String> addresses) { 
       System.out.println("added: " + addresses.size()); 
      } 

      public void presenceChanged(Presence presence) { 
       int i = 0; 
       for(RosterDTO rdto : rosterList) { 
        if (rdto.getUsuario().equals(presence.getFrom())) { 
         RosterDTO element = new RosterDTO(); 
         element.setEstatus("" + presence); 
         element.setUsuario(rosterList.get(i).getUsuario()); 
         rosterList.set(i, element); 
        } 
        i++; 
       } 
       System.out.println("ch: " + rosterList.toString()); 
      } 
     }); 
    }