javafx8 TableView Multiselection restituisce uno degli elementi selezionati come null

Question

TableView multi selezione restituisce uno degli oggetti selezionati come null. Questo non accade ogni volta ma succede la maggior parte delle volte quando provo a selezionare due righe nella tabella. similar to the issue defined in this question

Il modo migliore per riprodurre il problema è provare a selezionare due righe sequenziali. FXML:

<?xml version="1.0" encoding="UTF-8"?> 

<?import javafx.scene.control.Label?> 
<?import javafx.scene.control.ProgressBar?> 
<?import javafx.scene.control.TableColumn?> 
<?import javafx.scene.control.TableView?> 
<?import javafx.scene.control.TextField?> 
<?import javafx.scene.control.cell.PropertyValueFactory?> 
<?import javafx.scene.layout.AnchorPane?> 
<?import javafx.scene.layout.Region?> 
<?import javafx.scene.layout.StackPane?> 




<AnchorPane xmlns="http://javafx.com/javafx/8.0.65" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.test.controller.TestController"> 
       <children> 
        <TableView fx:id="personsTable" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="35.0"> 
         <placeholder> 
          <Label text="" /> 
         </placeholder> 
         <columns> 
          <TableColumn text="Name"> 
           <cellValueFactory> 
            <PropertyValueFactory property="name" /> 
           </cellValueFactory> 
          </TableColumn> 
          <TableColumn text="Address"> 
           <cellValueFactory> 
            <PropertyValueFactory property="address" /> 
           </cellValueFactory> 
          </TableColumn> 
          <TableColumn text="Course"> 
           <cellValueFactory> 
            <PropertyValueFactory property="course" /> 
           </cellValueFactory> 
          </TableColumn> 
          <TableColumn text="Country"> 
           <cellValueFactory> 
            <PropertyValueFactory property="country" /> 
           </cellValueFactory> 
          </TableColumn> 
         </columns> 
        </TableView> 
       </children> 
      </AnchorPane> 

Controller:

import java.net.URL; 
import java.util.ArrayList; 
import java.util.List; 
import java.util.ResourceBundle; 



import com.test.model.Person; 

import javafx.collections.FXCollections; 
import javafx.collections.ObservableList; 
import javafx.event.ActionEvent; 
import javafx.event.EventHandler; 
import javafx.fxml.FXML; 
import javafx.fxml.Initializable; 
import javafx.scene.control.ContextMenu; 
import javafx.scene.control.MenuItem; 
import javafx.scene.control.SelectionMode; 
import javafx.scene.control.TableView; 


public class TestController implements Initializable { 

    @FXML 
    TableView<Person> personsTable = new TableView<Person>(); 

    @Override 
    public void initialize(URL location, ResourceBundle resources) { 
     // TODO Auto-generated method stub 
     MenuItem combine = new MenuItem("Select"); 
     combine.setOnAction(new EventHandler<ActionEvent>() { 
      @Override 
      public void handle(ActionEvent event) { 
       List<Person> selectedPersons = new ArrayList<Person>(
         personsTable.getSelectionModel().getSelectedItems()); 
       for (Person person : selectedPersons) { 
        System.out.println(" the object is " + person); 
       } 
      } 
     }); 

     ContextMenu contextMenu = new ContextMenu(); 
     contextMenu.getItems().add(combine); 

     personsTable.setContextMenu(contextMenu); 

     personsTable.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE); 

     personsTable.setItems(getPendingOrders()); 
    } 

    public ObservableList<Person> getPendingOrders() { 
     ObservableList<Person> persons = FXCollections.observableArrayList(); 
     for (int i = 0; i < 100; i++) { 
      Person person = new Person(); 
      person.setName("Name" + i); 
      person.setAddress("Address" + i); 
      person.setCountry("Country" + i); 
      person.setCourse("Course" + i); 
      persons.add(person); 

     } 

     return persons; 
    } 
} 

Modello:

public class Person { 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

    public String getAddress() { 
     return address; 
    } 

    public void setAddress(String address) { 
     this.address = address; 
    } 

    public String getCountry() { 
     return country; 
    } 

    public void setCountry(String country) { 
     this.country = country; 
    } 

    public String getCourse() { 
     return course; 
    } 

    public void setCourse(String course) { 
     this.course = course; 
    } 

    private String name; 
    private String address; 
    private String country; 
    private String course; 

} 

Answer 1

1: aggiungere una fabbrica di celle predefinito al tuo TableView

2: ignorare o updateItem o updateIndex

spero che helpls