private String mResult = new String(); private String[] mFileList = null;

File flist = new File("/mnt/sdcard");  mFileList = flist.list();  for(String str: mFileList){    mResult += str;    mResult += "/n";  }TextView tv = (TextView)findViewById(R.id.result);
tv.setText(mResult.toString());

FilenameFilter fnf = new FilenameFilter(){    public boolean accept(File dir, String filename) {      if(filename.endsWith(".mp3")) return true;      return false;    }  };  mFileList = flist.list(fnf);  for(String str: mFileList){    mResult += str;    mResult += "/n";  }

FileFilter ff = new FileFilter(){    public boolean accept(File pathname) {      return pathname.isDirectory();    }  };File[] fileDir = flist.listFiles(ff);for (int i = 0; i < fileDir.length; i++) {    String str = fileDir[i].getName();    mResult += str;    mResult += "/n";  }