private final int MENU_DEL = Menu.FIRST;

    private final int MENU_MESS = Menu.FIRST+1;

    public void onCreateContextMenu(ContextMenu menu,View view,ContextMenuInfo menuinfo){

        menu.setHeaderTitle("先来这么几个");

        menu.add(Menu.NONE,MENU_DEL,0,R.string.DELETE);

        menu.add(Menu.NONE,MENU_MESS,0,R.string.MESS);

    }

    public boolean onContextItemSelected(MenuItem item){

        AdapterContextMenuInfo info = (AdapterContextMenuInfo)item.getMenuInfo();

        Music ss = allsongs.get(info.position);

        File file = new File(ss.getFileUrl());

        switch(item.getItemId()){

        case MENU_DEL:

            deleteFile(file);

            break;

        case MENU_MESS:

            break;

        default:

            break;

        }

        return true;

    }

    public void deleteFile(File f) {

        if (f.isDirectory()) {

            File[] files = f.listFiles();

            if (files != null && files.length > 0) {

                for (int i = 0; i < files.length; ++i) {

                    deleteFile(files[i]);

                }

            }

        }

        f.delete();

    }