Archived:Using eSWT FileDialog in Java ME

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ESWT is a deprecated UI framework. It is not present on Series 40 and on Symbian there are better UI frameworks for using File Dialog (e.g. LWUIT).

Article Metadata

Code Example

Source file: Media:FileDialogMIDletSource.zip

Installation file: Media:FileDialogMIDletBinaries.zip

Tested with

Devices(s): S60 3rd Ed. FP2 SDK

Compatibility

Platform(s): S60 3rd Edition, FP2

Article

Keywords: eSWT, FileDialog

Created: jarmlaht (07 May 2008)

Last edited: hamishwillee (26 Apr 2013)

Overview

This code snippet demonstrates how to use eSWT's FileDialog class in Java ME. A FileDialog can be opened and when a file is selected, its size is shown on the screen. The following section contains the complete code for compiling and running the example application.

Start Screen on E52
Selection window
Root of phone memory on E52

Selection window
Root of phone memory on PureView 808

Source code

import javax.microedition.midlet.*;
import org.eclipse.ercp.swt.mobile.Command;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.layout.FillLayout;
import javax.microedition.io.file.FileConnection;
import javax.microedition.io.Connector;
import java.io.IOException;
 
public class FileDialogMIDlet extends MIDlet implements Runnable, SelectionListener {
    private Thread UIThread;
    private Display display;
    private Shell formShell;
    private boolean exiting = false;
    private Command fileCommand;
    private Command exitCommand;
    private Text text;
    private String textString = "FileDialogMIDlet";
 
    public void startApp() {
        // Create the eSWT UI thread. 
        if(UIThread == null) {
            UIThread = new Thread(this);
            UIThread.start();
        }
    }
 
    public void pauseApp() {
    }
 
    public void destroyApp(boolean unconditional) {
        // Make the event loop exit in the eSWT UI thread.
        exitEventLoop();
        // Wait for the eSWT UI thread to die. 
        try {
            UIThread.join();
        } catch(InterruptedException e) {
        }
    }
 
    void exitEventLoop() {
        exiting = true;
        Display.getDefault().wake();
    }
 
    // The eSWT UI Thread. 
    public void run() {
        display = new Display();
        FillLayout fillLayout = new FillLayout();
        formShell = new Shell(display);
        formShell.setLayout(fillLayout);
        formShell.open();
        Composite form = new Composite(formShell, SWT.NONE);
        form.setLayout(fillLayout);
        text = new Text(form, SWT.READ_ONLY | SWT.WRAP);
        text.setText(textString);
        fileCommand = new Command(formShell, Command.SELECT, 0);
        fileCommand.setText("Open FileDialog");
        fileCommand.addSelectionListener(this);
        exitCommand = new Command(formShell, Command.EXIT, 0);
        exitCommand.setText("Exit");
        exitCommand.addSelectionListener(this);
        formShell.redraw();
 
        // Execute the eSWT event loop. 
        while(!exiting) {
            if(!display.readAndDispatch()) {
                display.sleep();
            }
        }
 
        // Clean up and destroy the MIDlet.
        display.dispose();
        notifyDestroyed();
    }
 
    public void widgetDefaultSelected(SelectionEvent e) {
    }
 
    public void widgetSelected(SelectionEvent e) {
        if (e.widget.equals(fileCommand)) {
            openFileDialog();
        }
        if (e.widget.equals(exitCommand)) {
            // Exit command selected, exit the event loop. 
            exitEventLoop();        
        }
    }
 
    public void openFileDialog() {
        FileDialog fDialog = new FileDialog(formShell);
        fDialog.open();
        String filterPath = fDialog.getFilterPath();
        String temp = filterPath.replace('\\', '/'); // '\‘ characters are replaced with '/'
        filterPath = temp;
        String fileName = fDialog.getFileName();
        String path = "file:///" + filterPath + fileName;
        // path is for example: file:///C:/Data/Images/image.png, this can be used as file    
        // URL for FileConnection
        if (!path.equals("file:///")) { 
            // Path equals "file:///", if file dialog is canceled.
            try {
                FileConnection fc = (FileConnection) Connector.open(path, Connector.READ);
                if (!fc.isDirectory()) {
                    textString = "File size: " + fc.fileSize() + " bytes";
                    text.setText(textString);            
                }
            } catch (IOException ioe) { 
                // Thrown if an I/O error occurs or if the method is invoked on a directory.
                // Note: It is not possible to select a directory in FileDialog.
                textString = "IOException: " + ioe.getMessage();
                text.setText(textString);
            }
            catch (SecurityException se) { 
                // Thrown if the security of the application does not have read access for
                // the file.
                textString = "SecurityException: " + se.getMessage();
                text.setText(textString);
            }
            formShell.redraw();        
        }
    }
}

Postconditions

When a FileDialog is opened and a file is selected in it, the file size is shown on the screen.

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Archived:Using eSWT FileDialog in Java ME

Comments

Manjeet207 - The import org.eclipse.ercp.swt.mobile.Command; can not be resolved .

Skalogir - eSWT would require a Symbian Development Environment and Device

Article Metadata

Contents

Overview

Source code

Postconditions

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