Question

您好我正在使用Codename One和Parse Server在我的移动应用程序中保存数据库，但我想将查询的每个结果放在一个按钮中，因为我需要单击List的每个元素。 ParseQuery.getQuery（“List”）“List”是数据库中引用的ID，“Title”返回String。

//Method:

public Container retrieveList(String content) {

    Container list = new Container(BoxLayout.y());

    ParseObject po = null;

    try {

        po = ParseObject.fetch(content /*class name*/, "nsC2NdmCuQ" /*objectId*/);

    } catch (ParseException e) {

        Dialog.show("Err", "Oops! Database is not available at the moment" + e.getCode(), "OK", null);
    }

    Label title = new Label("Book's Title: " + po.getString("Title"));
    list.addComponent(title);
    return list;
}

//MENU: 

public void listMenu() {

    final Form listMenu = new Form("Welcome to the List Menu");
    listMenu.setLayout(new BoxLayout(BoxLayout.Y_AXIS));

    ParseQuery<ParseObject> query = ParseQuery.getQuery("List");
    query.whereExists("Title");

    List<ParseObject> results = null;
    Container dumpList = null;

    listMenu.add(dumpList).removeAll();

    ParseServerDAO ps = new ParseServerDAO();

    try {

        results = query.find();

        int index = 0;
        for(;index < results.size();) {
            dumpList = ps.retrieveList(//How to get each element from results?);

            //Add each element of results to a button.
        }

    } catch (com.parse4cn1.ParseException e) {

        Dialog.show("Oops! Try later, server is not working right now.", "", "OK", null);
    }

    listMenu.add(dumpList);
}

Answer 1

如果你想要一个按钮列表，你应该做这样的事情：

public MultiButton retrieveListItem(String content, ActionListener l) {
    ParseObject po = null;
    try {

        po = ParseObject.fetch(content /*class name*/, "nsC2NdmCuQ" /*objectId*/);

    } catch (ParseException e) {

        Dialog.show("Err", "Oops! Database is not available at the moment" + e.getCode(), "OK", null);
    }

    MultiButton title = new MultiButton("Book's Title: " + po.getString("Title"));
    title.addActionListener(l);
    title.putClientProperty("ParseObject", po);
    return title;
}

请注意，您可以针对各种用例使用Button，MultiButton，SpanButton等。

请注意，在动作侦听器中，您需要在事件对象上调用getActualComponent()，而不在 getComponent()。

E.g。事件处理代码：

 public void actionPerformed(ActionEvent ev) {
     MultiButton mb = ev.getActualComponent();
     ParseObject po = (ParseObject)mb.getClientProperty("ParseObject");
 }

Codename One Parse Server检索List

1 个答案: