代码如下:
    private Dialog createMusicListDialog =null;
    private View textEntryView ;
    @Override
    protected Dialog onCreateDialog(int id)  
{
  switch (id) 
        {
        case 1:
            if (createMusicListDialog == null)
              {
          AlertDialog.Builder builder = new AlertDialog.Builder(this.getParent()) ;
                 builder.setIcon(R.drawable.dialog);
                     builder.setTitle("添加列表");
                         builder.setView(getTextEntryView());
                         builder.setCancelable(true);
                         builder.setPositiveButton("确定", addMusicListButtonListener());
                         createMusicListDialog = builder.create();
                
             }
          return createMusicListDialog;
        default:
            Log.e("music","Attempting to create an unkonwn dialog with an id of " + id);
            return null;
        }  
           
    }
//对话框里面的view
synchronized protected View getTextEntryView() 
{


if (textEntryView == null) 
        {
            LayoutInflater factory = LayoutInflater.from(this);
            textEntryView = factory.inflate(R.layout.musiclist_add, null);
        }
        return textEntryView;

    }
    
//按钮处理函数
 protected DialogInterface.OnClickListener addMusicListButtonListener()
 {
        return new DialogInterface.OnClickListener() 
        {
            public void onClick(DialogInterface dialog, int id)
            {
                //这里 id 的值 是-1
 System.out.println(id);
     }
        };
    }
显示 对话框的代码是   showDialog(1);为什么在按钮的处理函数里面对话框的id是-1 呢,