Android AlarmManager.cancle()方法无法实现功能？ 403.10 禁止访问-问答-阿里云开发者社区-阿里云

Android AlarmManager.cancle()方法无法实现功能？如何实现多个闹钟，闹钟的时间来自于数据库。。

Intent intent = new Intent(ClockActivity.this, AlermReceiver.class);
intent.putExtra("music", true);
pendingIntent = PendingIntent.getBroadcast(ClockActivity.this, 0, intent, 0);
//获取系统进程
am = (AlarmManager)getSystemService(ALARM_SERVICE);

//cancel

am.cancel(pendingIntent);