Kindle的下一个/上一页按钮在单击按钮后停止工作以更新页面内容

Question

我无法弄清楚为什么下一页/上一个页面按钮在按钮后停止工作，单击“更新页面内容”。

我的示例程序的代码如下。页面下一个/上一个页面按钮工作正常，直到使用D-Pad单击Kindle上的Go按钮。之后，下一个/上一个页面按钮不做任何事情。我做错了什么？

package com.example;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import org.apache.log4j.Logger;

import com.amazon.kindle.kindlet.AbstractKindlet;
import com.amazon.kindle.kindlet.KindletContext;
import com.amazon.kindle.kindlet.ui.KBoxLayout;
import com.amazon.kindle.kindlet.ui.KButton;
import com.amazon.kindle.kindlet.ui.KPages;
import com.amazon.kindle.kindlet.ui.KPanel;
import com.amazon.kindle.kindlet.ui.pages.PageProviders;

public class MyKindlet extends AbstractKindlet {    
    private static Logger logger = Logger.getLogger(MyKindlet.class);

    private KindletContext context;
    private final KPages pages = new KPages(PageProviders.createKBoxLayoutProvider(KBoxLayout.Y_AXIS));

    public void create(final KindletContext context) {
        this.context = context;

        for (int i = 0; i < 50; i++) {
            pages.addItem("This is item " + i);
        }
        logger.debug("pages: " + pages.getComponentCount());

        context.getRootContainer().add(pages, BorderLayout.CENTER);

        KPanel pnlControls = new KPanel();
        KButton btnGo = new KButton("Go!");
        pnlControls.add(btnGo);

        context.getRootContainer().add(pnlControls, BorderLayout.SOUTH);

        btnGo.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                EventQueue.invokeLater(new Runnable() {
                    public void run() {
                        addMoreItems("Yet another item ");
                    }
                });
            }
        });

        addMoreItems("Another item ");
    }

    private void addMoreItems(String prefix) {
        for (int i = 0; i < 50; i++) {
            pages.addItem(prefix + i);
        }
    }

    public void start() {
    }    

    public void stop() {
    }    

    public void destroy() {
    }
}

.

开发/测试环境：

KDK API 1.0
Kindle Keyboard (Kindle 3) emulator
JDK6/JRE6
Eclipse Indigo SR1
JDK compliance level 1.4

.

Answer 1

当KPages容器丢失焦点时，我们已经看到了这个问题。尝试调用

pages.requestFocus();

.