如何在活动开始前10分钟设置通知日历？

Question

我创建了活动。我想在事件开始时间的10分钟之前设置通知。

我在谷歌日历中看到他们已经设置了这样。

如何将日历设置为事件发生前的时间？

我在这里获取日历实例并设置日历。

  public void notification(Calendar c)
{

    Calendar cal  = Calendar.getInstance();

    int year =  cal.get(Calendar.YEAR);
    int  month =  cal.get(Calendar.MONTH);
    int  day = cal.get(Calendar.DATE);
    int  hour =   cal.get(Calendar.HOUR_OF_DAY);
    int  minute =  cal.get(Calendar.MINUTE);

        cal.set(Calendar.HOUR_OF_DAY, hour);
        cal.set(Calendar.MINUTE, minute);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        cal.set(Calendar.DATE, day);

        notification = c.getTime();
        notificationTime = df.format(notification);
       // notifyTime.setText(notificationTime);
        Toast.makeText(getApplicationContext(), String.valueOf(notification), Toast.LENGTH_SHORT).show();

    Intent intent = new Intent(getBaseContext(),NotificationReceiver.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(getBaseContext(), RQS_1, intent, 0);
    AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
    alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(),
            AlarmManager.INTERVAL_DAY *7, pendingIntent);

    ComponentName receiver = new ComponentName(getApplicationContext(),NotificationReceiver.class);
    PackageManager pm = getApplicationContext().getPackageManager();

    pm.setComponentEnabledSetting(receiver,
            PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
            PackageManager.DONT_KILL_APP);

}

谢谢..