基于MIDP实现Dialog组件[3]

    public ConfirmationDialog(Display display, String amessage,
            String ayesLabel, String anoLabel)
    {
        super(display);
        this.message = (amessage == null) ? "继续操作？" : amessage;
        this.yesLabel = (yesLabel == null) ? "确定" : ayesLabel;
        this.noLabel = (noLabel == null) ? "返回" : anoLabel;

yesCommand = new Command(yesLabel, Command.OK, 1);
        noCommand = new Command(noLabel, Command.CANCEL, 1);

        canvas = new WaitCanvas(message, true);
        canvas.addCommand(yesCommand);
        canvas.addCommand(noCommand);
        canvas.setCommandListener(this);
    }

    public String getMessage()
    {
        return message;
    }

    public void setMessage(String message)
    {
        this.message = message;
    }

    public void commandAction(Command c, Displayable d)
    {
        if (c == yesCommand)
        {
            dismiss(YES);
        } else if (c == noCommand)
        {
            dismiss(NO);
        }
    }

    protected Displayable getDisplayable()
    {
        return canvas;
    }

}

import javax.microedition.lcdui.*;

public class MessageDialog extends Dialog implements CommandListener
{

    public static final int OK = 0;
    protected Command command;
    protected Canvas canvas;
    private String message;
    private String label;

    public MessageDialog(Display display, String message)
    {
        this(display, message, null);
    }

    public MessageDialog(Display display, String amessage, String alabel)
    {
        super(display);
        this.message = (amessage == null)?"完成":amessage;
        this.label = (alabel == null)?"确定":alabel;
        command = new Command(label, Command.OK, 1);
        canvas = new WaitCanvas(message, true);
        canvas.addCommand(command);
        canvas.setCommandListener(this);

    }

    public void commandAction(Command c, Displayable d)
    {
        if (c == command)
        {
            dismiss(OK);
        }
    }

    protected Displayable getDisplayable()
    {
        return canvas;
    }

}

你可以方便的在自己的程序中使用这两个Dialog，你也可以扩展Dialog类实现自己的Dialog，下面是测试这两个Dialog的MIDlet。首先我们看一下它的截图然后给出源代码！

这里只给出用户选择确定的界面，如果你选择返回那么知识下面的文字改变。

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class DialogTest extends MIDlet implements CommandListener,
        DialogListener
{

    private Display display;
    private Form mainForm;
    private ConfirmationDialog confirm;
    private MessageDialog message;