How to read an image from Gallery in Java ME

Comments

Error in the code

The line:

is.read(bytes, 0, size);

Should read:

int bytesRead = 0;
while (bytesRead < size) {
    bytesRead += is.read(bytes, bytesRead, size - bytesRead);
}

InputStream.read() does not necessarily read as many bytes as you want.

Unfortunately, the file is locked and I can't fix it!

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Article Metadata

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Tested with

SDK: Series 40 6th Edition SDK, Nokia SDK 1.0 for Java, Nokia SDK 1.1 for Java, Nokia SDK 2.0 for Java

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Compatibility

Platform(s): Series 40 6th Edition SDK, Nokia SDK 1.0 for Java, Nokia SDK 1.1 for Java, Nokia SDK 2.0 for Java (beta)

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Article

Created: jarmlaht (15 Feb 2008)

Last edited: jumantyn (30 Jul 2012)

Overview

This article shows, how to read an image from Gallery by using FileConnection API (JSR-75) and show it on Form. The Gallery folders can be accessed by using system properties, for example: System.getProperty("fileconn.dir.photos"). File contents are read by using InputStream, data is saved to a byte array and Image object is created by using Image.createImage() method.

The full source code for a test MIDlet:

Source code: ReadMIDlet.java

import javax.microedition.midlet.MIDlet;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Image;
import javax.microedition.io.file.FileConnection;
import javax.microedition.io.Connector;
import java.io.InputStream;
import java.io.IOException;
 
public class ReadMIDlet extends MIDlet implements CommandListener {
    private Form form;
    private String photos = "fileconn.dir.photos";
    private Image image;
    private Command exitCommand;
 
    public void startApp() {
        form = new Form("ReadMIDlet");
        exitCommand = new Command("Exit", Command.EXIT, 1);
        form.addCommand(exitCommand);
        form.setCommandListener(this);
        Display.getDisplay(this).setCurrent(form);
        String path = System.getProperty(photos); // for example: file:///C:/Data/Images/
        form.append("path = " + path);
        // An image "image.png" must be in the folder shown above
        image = readFile(path + "image.png");
        if (image != null) form.append(image);
        else form.append("Image not found!");
    }
 
    public void pauseApp() {
    }
 
    public void destroyApp(boolean unconditional) {
    }
 
    public Image readFile(String path) {
        try {
            FileConnection fc = (FileConnection)Connector.open(path, Connector.READ);
            if(!fc.exists()) {
                System.out.println("File doesn't exist!");
            }
            else {
                int size = (int)fc.fileSize();
                InputStream is = fc.openInputStream();
                byte bytes[] = new byte[size];
                is.read(bytes, 0, size);
                image = Image.createImage(bytes, 0, size);
            }
 
        } catch (IOException ioe) {
            System.out.println("IOException: "+ioe.getMessage());
        } catch (IllegalArgumentException iae) {
            System.out.println("IllegalArgumentException: "+iae.getMessage());
        }
        return image;
   }
 
    public void commandAction(Command c, Displayable d) {
        if (c == exitCommand) this.notifyDestroyed();
    }
}

See also

• How to list root file systems in Java ME
• How to write data to a file in Java ME
• How to list files and folders in Java ME