如何在j2me中獲取所有.mp3文件（來自媒體卡和設備內存）？

Question

反正有沒有像android一樣在j2me中獲得所有.mp3文件列表。 如果不是什麼是獲得所有mp3文件的最佳方式。

感謝。

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(); 
     } 
    } 
}