udpform.java

来自「J2ME MIDP_Example_Applications」· Java 代码 · 共 103 行

// Copyright 2003 Nokia Corporation.
//
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// unnamed package

import javax.microedition.lcdui.*;
import java.io.*;


class UDPForm
    extends Form
    implements CommandListener, UDPHandlerListener
{
    private final UDPMIDlet midlet;
    private final UDPHandler handler;
    private final TextField dataField;
    private final StringItem statusField;
    private final Command sendCommand;
    private final Command quitCommand;


    UDPForm(UDPMIDlet midlet, UDPHandler handler)
    {
        super("UDP MIDlet");
        this.midlet = midlet;
        this.handler = handler;
        handler.setUDPHandlerListener(this);

        dataField = new TextField("Data", "test", 10, TextField.ANY);
        append(dataField);
        statusField = new StringItem("Status", null);
        append(statusField);

        sendCommand = new Command("Send", Command.SCREEN, 2);
        addCommand(sendCommand);
        quitCommand = new Command("Quit", Command.EXIT, 1);
        addCommand(quitCommand);
        setCommandListener(this);
    }


    public void commandAction(Command cmd, Displayable disp)
    {
        if (cmd == sendCommand)
        {
            String data = dataField.getString();
            statusField.setText("Sending...");

            handler.queueMessageForSending(data.getBytes());
        }
        else if (cmd == quitCommand)
        {
            midlet.formQuit();
        }
    }


    public void handleDatagram(byte[] data)
    {
        String msg = new String(data);
        statusField.setText("Received: \"" + msg + "\"");
    }


    public void handleError(String errorMessage)
    {
        statusField.setText("I/O Error in receive: \"" + errorMessage + "\"");
    }
}