android 对话框中弹出对话框原对话框关闭

AlertDialog.Builder dialogBuilder = new Builder(
                        testdialog.this);
                dialogBuilder.setTitle("确认对话框");
            
                String[] strarrStrings = new String[] {"订购", "删除" };
                dialogBuilder.setItems(strarrStrings, 
               new DialogInterface.OnClickListener()
                {
                    
                    @Override
                    public void onClick(DialogInterface dialog, int which)
                    {
                        // TODO Auto-generated method stub
                    switch (which)
                    {
                        case 0:
                            Toast.makeText(testdialog.this, "订购", Toast.LENGTH_SHORT).show();

                            break;
                        case 1:
                            AlertDialog.Builder mBuilder=new Builder(testdialog.this);
                            mBuilder.setTitle("确定要删除吗？");
                            mBuilder.setMessage("确定要删除吗");
                            mBuilder.show();
                            break;
                        default:
                            break;
                    }
                            
                            
                               
                        
                    }
                });
                dialogBuilder.show();