file browse J2ME

[nitish dhar]

i downloaded a file browse code from the net...it runs fine

but the problem is that after i press the view command it asks for permissions more than once to read the files inside a particular folder

I think the problem is how the code creates the file connector:

    
 
currDir = (FileConnection)Connector.open("file:///" + currDirName);
 

wat modifications am i supposed to make

 
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
import java.util.*;
import java.io.*;
import javax.microedition.io.*;
import javax.microedition.io.file.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
 
public class file_browse extends MIDlet implements CommandListener 
{
    private String currDirName;
 
    private Command view = new Command("View", Command.ITEM, 1);
    private Command back = new Command("Back", Command.BACK, 2);
    private Command exit = new Command("Exit", Command.EXIT, 3);
 
    private final static String UP_DIRECTORY = "/";
    private final static String MEGA_ROOT = "/";
    private final static String SEP_STR = "/";
    private final static char   SEP = '/';
 
    public file_browse() 
    {
        System.out.println("here1");
        currDirName = MEGA_ROOT;
    }
 
    public void startApp() 
    {
        boolean isAPIAvailable = false;
        if (System.getProperty("microedition.io.file.FileConnection.version") != null)
        {
            isAPIAvailable = true;
            System.out.println("hi");
            try 
            {
                showCurrDir();
                System.out.println("h5");
            } 
            catch (SecurityException e) 
            {
                System.out.println(e);
            } 
            catch (Exception e) {System.out.println(e);}
        }
        else
        {
            StringBuffer splashText = new StringBuffer
            (getAppProperty("MIDlet-Name")).append("\n").append(
            getAppProperty("MIDlet-Vendor")).
            append(isAPIAvailable?"":"\nFileConnection API not available");
            Alert splashScreen = new Alert(null,splashText.toString(),
            null,AlertType.INFO);
            splashScreen.setTimeout(3000);
            Display.getDisplay(this).setCurrent(splashScreen);
        }
    
    }
 
    public void pauseApp() {}
 
    public void destroyApp(boolean cond) 
    {
        notifyDestroyed();
    }
 
    public void commandAction(Command c, Displayable d) 
    {
        System.out.println("updir:"+UP_DIRECTORY);
        if (c == view) 
        {
            List curr = (List)d;
            final String currFile = curr.getString(curr.getSelectedIndex());
            System.out.println("currFile:"+currFile);
            
            new Thread(new Runnable() 
            {
                public void run() 
                {
                    if (currFile.endsWith(SEP_STR) || currFile.equals(UP_DIRECTORY)) 
                    {
                        System.out.println("h7");
           
                        traverseDirectory(currFile);
                    }
                    else 
                    {
                        showFile(currFile);
                    }
                }
            }                       ).start();
        }
        else if (c == back) 
        {
            showCurrDir();
        } 
        else if (c == exit) 
        {
            destroyApp(false);
        }
    }
 
    void showCurrDir() 
    {
        Enumeration e;
        FileConnection currDir = null;
        List browser;
        try 
        {
            System.out.println("In showCurrDir");
            System.out.println("mega_root:"+MEGA_ROOT+"cur_dir:"+currDirName);
            if (MEGA_ROOT.equals(currDirName)) 
            {
                e = FileSystemRegistry.listRoots();
                browser = new List(currDirName, List.IMPLICIT);
                System.out.println("here");
            } 
            else 
            {
                System.out.println("connector");
                currDir = (FileConnection)Connector.open("file://localhost/" + currDirName);
                System.out.println("curr_dir:"+currDir);
                //currDir = (FileConnection)Connector.open("http://localhost:8080/" + currDirName);
                e = currDir.list();
                browser = new List( currDirName, List.IMPLICIT);
                browser.append(UP_DIRECTORY,null);
            }
            while (e.hasMoreElements()) 
            {
                System.out.println("h2");
                String fileName = (String)e.nextElement();
                System.out.println("fileName:"+fileName+" char_at:"+fileName.charAt(fileName.length()-1));
                    
                if (fileName.charAt(fileName.length()-1) == SEP) 
                {
                    browser.append(fileName,null);
                    
                } 
                //if((fileName.charAt(fileName.length()-1))).equals("g"))){}
                else 
                {
                    System.out.println("h4");
                    //Image image = Image.createImage(fileName);
                    browser.append(fileName,null);
                    //Form form = new Form("Image here");
                    
                    //form.append(image);
                }
            }
            browser.setSelectCommand(view);
            browser.addCommand(exit);
            browser.setCommandListener(this);
            if (currDir != null) 
            {
                currDir.close();
            }
            Display.getDisplay(this).setCurrent(browser);
        } 
        catch (IOException ioe) 
        {
            System.out.println(ioe);
        }
    }
  
    void traverseDirectory(String fileName) 
    {
        System.out.println("fileName:"+fileName+"cur_dir:"+currDirName+"mega_root:"+MEGA_ROOT);
        if (currDirName.equals(MEGA_ROOT)) 
        {
            if (fileName.equals(UP_DIRECTORY)) 
            {
                // can not go up from MEGA_ROOT
                return;
            }
            currDirName = fileName;
        } 
        else if (fileName.equals(UP_DIRECTORY)) 
        {
            System.out.println("up");
            // Go up one directory
            // TODO use setFileConnection when implemented
            int i = currDirName.lastIndexOf(SEP, currDirName.length()-2);
            if (i != -1) 
            {
                currDirName = currDirName.substring(0, i+1);
            } 
            else 
            {
                currDirName = MEGA_ROOT;
            }
        } 
        else 
        {
            currDirName = currDirName + fileName;
        }
        showCurrDir();
    }
  
    void showFile(String fileName) 
    {
        try 
        {
            FileConnection fc = (FileConnection)
            Connector.open("file://localhost/" + currDirName + fileName);
            if (!fc.exists()) 
            {
                throw new IOException("File does not exists");
            }
            InputStream fis = fc.openInputStream();
            byte[] b = new byte[1024];
            int length = fis.read(b, 0, 1024);
            fis.close();
            fc.close();
 
            TextBox tb = new TextBox("View File: " + fileName, null, 1024,
            TextField.ANY | TextField.UNEDITABLE);
 
            tb.addCommand(back);
            tb.addCommand(exit);
            tb.setCommandListener(this);
 
            if (length > 0) 
            {
                tb.setString(new String(b, 0, length));
            }
            Display.getDisplay(this).setCurrent(tb);
        }
        catch (Exception e) {}
    }
} 
 
 

[ August 28, 2008: Message edited by: nitish dhar ]
[ August 28, 2008: Message edited by: nitish dhar ]

[nitish dhar]

got it done in the preference>>security set security as manufacturer

no more access permissions now

[Rhianty Alfa]

how to modification this method (showFile)
InputStream fis = fc.openInputStream ();
byte[] b = new byte[1024];

int length = fis.read (b, 0, 1024);

fis.close ();
fc.close ();

TextBox viewer =
new TextBox (
"View File: " + fileName, null, 1024,
TextField.ANY | TextField.UNEDITABLE);

viewer.addCommand (back);
viewer.addCommand (exit);
viewer.setCommandListener (this);

if (length > 0) {
viewer.setString (new String (b, 0, length));
}

Display.getDisplay (this).setCurrent (viewer);

it's just show file with extension *.txt
how to read a file pdf (*.pdf)??

Regards,

[Tim Holloway]

Welcome to the JavaRanch, Rhianty!

I think your answer came a little too late. We call this "awakening a zombie". Since the last post was in 2008, it's very likely that not only is Nitesh working on some other project by now, he's probably not even working for the same employer!

[Rhianty Alfa]

i don't understand what you say....
well, I apologize if I was presumptuous to write as above. I just want to find a solution to my final project.

thanks

[Tim Holloway]

I wouldn't call it "presumptuous". We certainly welcome published solutions to any problem. Just pointing out that it's probably too late to help the original posters.

You can start your own thread, though anytime you have a topic of interest.