file_browse.java

Mobile Phone File browser

/* 
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 * and open the template in the editor. 
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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) {}  
    }  
}