您好,我正在使用 Codename One 和 Parse Server 将数据库保存在我的移动应用程序中,但我想将查询的每个结果放在一个按钮中,因为我需要单击列表中的每个元素。 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); }
最佳答案
如果你想要一个按钮列表,你可能应该这样做:
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,您可以使用 Button
, MultiButton
, SpanButton
等用于各种用例。
请注意,在操作监听器中,您需要调用 getActualComponent()
在事件对象上,不 getComponent()
.
例如事件处理代码:
public void actionPerformed(ActionEvent ev) {
MultiButton mb = ev.getActualComponent();
ParseObject po = (ParseObject)mb.getClientProperty("ParseObject");
}
关于java - Codename 一台用于检索列表的解析服务器,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/49522067/