J2MEImageLoader.java Source code

Introduction

Here is the source code for J2MEImageLoader.java

Source

import java.io.DataInputStream;
import java.io.IOException;

import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.ImageItem;
import javax.microedition.midlet.MIDlet;

public class J2MEImageLoader extends MIDlet implements CommandListener, Runnable {
    private Display mDisplay;

    private Form mForm = new Form("Connecting...");

    public J2MEImageLoader() {
        mForm.addCommand(new Command("Exit", Command.EXIT, 0));
        mForm.setCommandListener(this);
    }

    public void startApp() {
        mDisplay = Display.getDisplay(this);
        mDisplay.setCurrent(mForm);

        Thread t = new Thread(this);
        t.start();
    }

    public void pauseApp() {
    }

    public void destroyApp(boolean unconditional) {
    }

    public void commandAction(Command c, Displayable s) {
        if (c.getCommandType() == Command.EXIT)
            notifyDestroyed();
    }

    public void run() {
        HttpConnection hc = null;
        DataInputStream in = null;

        try {
            hc = (HttpConnection) Connector.open("http://www.y.com/image.gif");
            int length = (int) hc.getLength();
            byte[] data = null;
            if (length != -1) {
                data = new byte[length];
                in = new DataInputStream(hc.openInputStream());
                in.readFully(data);
            } else {
                int chunkSize = 512;
                int index = 0;
                int readLength = 0;
                in = new DataInputStream(hc.openInputStream());
                data = new byte[chunkSize];
                do {
                    if (data.length < index + chunkSize) {
                        byte[] newData = new byte[index + chunkSize];
                        System.arraycopy(data, 0, newData, 0, data.length);
                        data = newData;
                    }
                    readLength = in.read(data, index, chunkSize);
                    index += readLength;
                } while (readLength == chunkSize);
                length = index;
            }
            Image image = Image.createImage(data, 0, length);
            ImageItem imageItem = new ImageItem(null, image, 0, null);
            mForm.append(imageItem);
            mForm.setTitle("Done.");
        } catch (IOException ioe) {
            mForm.setTitle("Error.");
        }
    }
}