j2me에서 모든 .mp3 파일 (미디어 카드와 장치 메모리 모두)을 얻는 방법은 무엇입니까?

Question

안드로이드와 같은 j2me의 모든 .mp3 파일 목록을 가져 오는 방법이 있습니까? 모든 mp3 파일을 가져 오는 가장 좋은 방법은 무엇입니까?

감사합니다.

Answer 1

import java.io.IOException; 
import javax.microedition.midlet.*; 
import javax.microedition.lcdui.*; 
import java.util.Enumeration; 
import java.util.Hashtable; 
import javax.microedition.io.Connector; 
import javax.microedition.io.file.*; 

/** 
* @author crazywizard 
*/ 
public class RootMIDlet extends MIDlet implements CommandListener{ 
    private List list; 
    private Command exitCommand; 
    private Hashtable allowed_types; 

    public RootMIDlet(){ 
     /* Construct MIDlet */ 
     //Define the file types of interest here 
     allowed_types = new Hashtable(); 
     allowed_types.put("mp3", "audio/mp3");   
    } 

    public void startApp() { 
     list = new List("My Files", List.IMPLICIT); 
     exitCommand = new Command("Exit", Command.EXIT, 0); 
     list.addCommand(exitCommand); 
     list.setCommandListener(this); 
     Display.getDisplay(this).setCurrent(list); 
     getRootList();   
    } 

    public void pauseApp() { 
    } 

    public void destroyApp(boolean unconditional) { 
    } 

    public void getRootList(){ 
     //Get ALL available filesystem mounts 
     Enumeration drives = FileSystemRegistry.listRoots(); 
     while(drives.hasMoreElements()){ 
      //Iterate through the drives 
      String driveString = drives.nextElement().toString(); 
      list.append("Searching "+driveString, null); 
      getFileList("file:///"+driveString); 
     } 
    }//--End of getRootList() 

    public void getFileList(String path){ 
     try { 
      //Open path 
      FileConnection fc = (FileConnection)Connector.open(path, Connector.READ); 
      //Get list of ALL files and dirs 
      Enumeration filelist = fc.list(); //Get Hidden files as well --fc.list("*", true); 
      while(filelist.hasMoreElements()){ 
       String filename = (String)filelist.nextElement();     
       FileConnection fc1 = (FileConnection)Connector.open(path+filename, Connector.READ); 
       //Check for dirs 
       if(fc1.isDirectory()){      
        //Apply recursion here 
        getFileList("file://"+fc1.getPath()+filename); //Note use of *double // instead of triple ///. Adjust accordingly according to phone platform 
       }else{ 
        //Filter for only allowed types == .mp3 
        String file_type = getFileType(filename).toLowerCase(); 
        if(!allowed_types.containsKey(file_type)){ 
         //Do Nothing and Pass 
         continue; 
        } 
        list.append(fc1.getPath()+filename, null); 
       } 
      } 
      //Clean resources 
      fc.close(); 
     } catch (IOException ioe) { 
      ioe.printStackTrace(); 
      Display.getDisplay(this).setCurrent(new Alert("Error", ioe.toString(), null, AlertType.ERROR)); 
     } catch (Exception ex) { 
      ex.printStackTrace(); 
      Display.getDisplay(this).setCurrent(new Alert("Error", ex.toString(), null, AlertType.ERROR)); 
     } 
    } 

    /* Helper Method */ 
    private String getFileType(String fileName){ 
     //Get file extension from fileName 
     char ch = '.'; 
     int index = fileName.lastIndexOf((int)ch); 
     return fileName.substring(index+1); 
    }//--End of getFileType(String) 

    public void commandAction(Command c, Displayable d) { 
     if(c == exitCommand){ 
      notifyDestroyed(); 
     } 
    } 
}