observableList 不会在循环中显示行吗？

Question

我有一个问题，我要花几天时间在循环中显示 observablelist 中的行！然而，代码在控制台中的功能非常好！欢迎任何帮助。

 private void showActivitiesDriver() throws IOException {
            Path path = Paths.get("Download/Cards/F__100000015956101711071539.C1B");
            byte[] data = Files.readAllBytes(path);
            dataFileCard = new FileBlockTGD(data);
            w = new WrapperActivityChangeInfo(dataFileCard.getDriver_activity_data()
                    .getActivityDailyRecords().get(i), dataFileCard.getDriver_activity_data()
                    .getActivityDailyRecords().get(i).getActivityChangeInfo().get(j));

            for (i = 0; i < dataFileCard.getDriver_activity_data().getActivityDailyRecords().size(); i++) {

                w.setTheDateTime(dataFileCard.getDriver_activity_data()
                        .getActivityDailyRecords().get(i).getActivityRecordDate().toString());

                System.out.println(w.getTheDateTime());

                dateActivitiesColumn.setCellValueFactory(cellData -> new SimpleStringProperty(
                        cellData.getValue().getTheDateTime()));

                /*
                dateActivitiesColumn.setCellValueFactory(cellData -> new ReadOnlyStringWrapper(
                        DateUtil.parseDateToString(cellData.getValue().getActivityRecordDate())));
                */       

                for (j = 0; j < dataFileCard.getDriver_activity_data().getActivityDailyRecords().get(i).
                        getActivityChangeInfo().size(); j++) {

                    driverActivitiesColumn.setCellValueFactory(cellData -> new SimpleStringProperty(
                            cellData.getValue().getTheActivity()));

                    WrapperActivityChangeInfoList = FXCollections.observableArrayList();

                    WrapperActivityChangeInfoList.add(new WrapperActivityChangeInfo(dataFileCard.getDriver_activity_data()
                            .getActivityDailyRecords().get(i), dataFileCard.getDriver_activity_data()
                            .getActivityDailyRecords().get(i).getActivityChangeInfo().get(j)));
                    System.out.println(WrapperActivityChangeInfoList);
                }

            }
            // Set data to tableview
            activitiesDriverTableView.setItems(WrapperActivityChangeInfoList);
            //System.out.println(WrapperActivityChangeInfoList.toString());
        }
    }

我希望看到所有行，但只有一个，但代码在控制台中运行良好。

Answer 1

您在内循环的每次迭代中创建一个新的ObservableList（最初为空）。这样，在add 调用之后，您将获得一个包含单个列表的列表。最后将其中一个列表分配给TableView。应该会在输出中看到一系列日期后跟多个WrapperActivityChangeInfo.toString 结果被[] 包围，表明您正在打印多个列表。

此外，在循环的每次迭代中分配 cellValueFactory 是没有意义的。

您需要将列表创建移到循环之外。：

...

WrapperActivityChangeInfoList = FXCollections.observableArrayList();

driverActivitiesColumn.setCellValueFactory(cellData -> new SimpleStringProperty(
                cellData.getValue().getTheActivity()));

for (i = 0; i < dataFileCard.getDriver_activity_data().getActivityDailyRecords().size(); i++) {

    ...       

    for (j = 0; j < dataFileCard.getDriver_activity_data().getActivityDailyRecords().get(i).
            getActivityChangeInfo().size(); j++) {

        WrapperActivityChangeInfoList.add(new WrapperActivityChangeInfo(dataFileCard.getDriver_activity_data()
                .getActivityDailyRecords().get(i), dataFileCard.getDriver_activity_data()
                .getActivityDailyRecords().get(i).getActivityChangeInfo().get(j)));
        System.out.println(WrapperActivityChangeInfoList);
    }

}
activitiesDriverTableView.setItems(WrapperActivityChangeInfoList);