java.lang.UnsupportedOperationException，用于从javafx tableview中删除一行 [英] java.lang.UnsupportedOperationException for removing a row from the javafx tableview

问题描述

我正在尝试从javafx的tableview中删除选定的记录. 下面是我用数据填充表的方式:

I am trying to delete the selected record from the tableview in javafx. Below is how I am populating the table with the data:

public void setMainApp(MainAppClass mainApp){
    this.mainApp = mainApp;

    FilteredList<FileModel> filteredData = new FilteredList<>(mainApp.getFileData(), p -> true);

    // 2. Set the filter Predicate whenever the filter changes.
    filterField.textProperty().addListener((observable, oldValue, newValue) -> {
        filteredData.setPredicate(files -> {
            // If filter text is empty, display all files.
            if (newValue == null || newValue.isEmpty()) {
                return true;
            }

            String lowerCaseFilter = newValue.toLowerCase();
            if (files.getFileSubject().toLowerCase().indexOf(lowerCaseFilter) != -1) {
                return true; // Filter matches Subject.
            }
                else if (files.getFileDate().toLowerCase().indexOf(lowerCaseFilter) != -1) {
                return true; // Filter matches last name.
            }
            return false; // Does not match.
        });
    });

    // 3. Wrap the FilteredList in a SortedList. 
    SortedList<FileModel> sortedData = new SortedList<>(filteredData);

    // 4. Bind the SortedList comparator to the TableView comparator.
    sortedData.comparatorProperty().bind(fileTable.comparatorProperty());

    // 5. Add sorted (and filtered) data to the table.

    fileTable.setItems(sortedData);
}

这就是我要删除记录的方式:

And thats how I am removing the record:

@FXML
private void deleteFile() {
    int selectedIndex = fileTable.getSelectionModel().getSelectedIndex();
    if (selectedIndex >= 0) {
        fileTable.getItems().remove(selectedIndex);
    } else {
        // Nothing selected.
        Alert alert = new Alert(AlertType.WARNING);
        alert.initOwner(mainApp.getPrimaryStage());
        alert.setTitle("No Selection");
        alert.showAndWait();
    }
} 

但是它给出了java.lang.UnsupportedOperationException错误.我在示例项目中做了同样的事情，一切顺利.那么，我该如何解决这个问题?

But it gives java.lang.UnsupportedOperationException error. I have done the same thing in my sample project and it goes fine. So, how can I resolve this issue?

推荐答案

从基础列表中删除数据，而不是从过滤/排序后的列表中删除数据:

Remove the data from the underlying list, not the filtered/sorted list:

FileModel selectedItem = fileTable.getSelectionModel().getSelectedItem();
if (selectedItem != null) {
    mainApp.getFileData().remove(selectedItem);
}

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