Monitoring file system roots

To receive notifications when a file system root is added to or removed from the device:

1. Implement a FileSystemListener. The mandatory FileSystemListener.rootChanged method is called every time a file system root is either added to or removed from the device.

   The following code snippet creates the framework for a separate listener class that implements FileSystemListener.

   import javax.microedition.io.file.FileSystemListener;
   
   public class MyFileSystemListener implements FileSystemListener {
   
       public void rootChanged(int state, String rootName) {
   
           // Handle detected root changes
           // If state == FileSystemListener.ROOT_ADDED, rootName was added
           // If state == FileSystemListener.ROOT_REMOVED, rootName was removed
   
       }
   
   }

2. Register the implemented FileSystemListener by calling the FileSystemRegistry.addFileSystemListener method.

   The following code snippet registers a MyFileSystemListener for the MIDlet.

   // Create a MyFileSystemListener instance
   MyFileSystemListener myFileSystemListener = new MyFileSystemListener();
   
   // Register the MyFileSystemListener
   FileSystemRegistry.addFileSystemListener(myFileSystemListener);