android 闹钟,该如何处理(4)

                        {  
                            // 指定启动AlarmActivity组件  
                            Intent intent = new Intent(MainActivity.this  
                                , AlarmActivity.class);  
                            // 创建PendingIntent对象  
                            PendingIntent pi = PendingIntent.getActivity(  
                                MainActivity.this, 0, intent, 0);  
                            Calendar c = Calendar.getInstance();  
                            c.setTimeInMillis(System.currentTimeMillis());  
                            // 根据用户选择时间来设置Calendar对象  
                            c.set(Calendar.HOUR , hourOfDay);  
                            c.set(Calendar.MINUTE , minute); 
                            c.set(Calendar.SECOND , 0); ///////////////////////////////////////////////////////////////
                            c.set(Calendar.MILLISECOND, 0);