Connessione file + J2ME

Question

Voglio rendere l'applicazione in cui posso ottenere tutte le immagini, indipendentemente dal fatto che sia nel telefono o nella memoria esterna.Voglio importare tutte le immagini nella mia applicazione.Come può essere possibile?Sono venuto a sapere che è possibile tramite connessione file.Ma non ottenere idea esatta.

Answer 1

1. Get all the file system roots using FileSystemRegistry.listRoots()
2. Open connection to each root in turn using FileConnection fconn = (FileConnection)Connector.open(root)
3. List the folder using fconn.list().
4. For each entry in the list, if it ends with an image extension (file.getName().endsWith(".png") etc), then it's an image.
5. If the entry is a folder (file.isDirectory() returns true) then use fconn.setFileConnection(folder) to traverse into that directory/
6. Do the same recursively for all folders in all roots.

Answer 2

Here is a code snippet I once used for my application. It more or less does the same in funkybros steps.

 protected void showFiles() {
        if (path == null) {
            Enumeration e = FileSystemRegistry.listRoots();
            path = DATAHEAD; //DATAHEAD = file:///
            setTitle(path);
            while (e.hasMoreElements()) {
                String root = (String) e.nextElement();
                append(root, null);
            }
            myForm.getDisplay().setCurrent(this);
        } else {
                        //this if-else just sets the title of the Listing Form
                        if (selectedItem != null) {
                            setTitle(path + selectedItem);
                        }
                        else {
                            setTitle(path);
                        }
            try {
// works when users opens a directory, creates a connection to that directory
                if (selectedItem != null) {
                    fileConncetion = (FileConnection) Connector.open(path + selectedItem, Connector.READ);
                } else // works when presses 'Back' to go one level above/up
                {
                    fileConncetion = (FileConnection) Connector.open(path, Connector.READ);
                }
// Check if the selected item is a directory
                if (fileConncetion.isDirectory()) {
                    if (selectedItem != null) {
                        path = path + selectedItem;
                        selectedItem = null;
                    }
                    //gathers the directory elements
                    Enumeration files = fileConncetion.list();
                    while (files.hasMoreElements()) {
                        String file = (String) files.nextElement();
                        append(file, null);
                    }
//
                    myForm.getDisplay().setCurrent(this);
                    try {
                        if (fileConncetion != null) {
                            fileConncetion.close();
                            fileConncetion = null;
                        }
                    } catch (IOException ex) {
                        ex.printStackTrace();
                    }
                }//if (fileConncetion.isDirectory())
                else {
                    System.out.println(path);
                    //if it gets a file then calls the publishToServer() method
                    myForm.publishToServer();

                }