android提醒

Question

I'm new on android programming and i'm working on reminder application. now, i've done storing all information including date and time into SQLlite database. my question is how do i match alarm that stored in database with current time on android

Answer 1

query the data base compare with calendar

Calendar c = Calendar.getInstance();
c.set(Calendar.MONTH, Calendar.MARCH);
c.set(Calendar.DAY_OF_MONTH, 3);
long time2=   c.getTimeInMillis();
c.set(Calendar.MONTH, Calendar.AUGUST);
  c.set(Calendar.DAY_OF_MONTH, 8);   
   long time3=   c.getTimeInMillis();
   if(time>time2){
 //Logic
 if(time>time3){
     //Logic
 }
 }

Answer 2

What you need to do is first create the intent you need to schedule. Then obtain the pendingIntent of that intent. You can schedule activities, services and broadcasts. To schedule an activity eg MyActivity:

  Intent i = new Intent(getApplicationContext(), MyActivity.class);
  PendingIntent pi = PendingIntent.getActivity(getApplicationContext(),3333,i,
  PendingIntent.FLAG_CANCEL_CURRENT);

Give this pendingIntent to alarmManager:

//getting current time and add 5 seconds in it
  Calendar cal = Calendar.getInstance();
  cal.add(Calendar.SECOND, 5);
  //registering our pending intent with alarmmanager
  AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
  am.set(AlarmManager.RTC_WAKEUP,cal.getTimeInMillis(), pi);

Now MyActivity will be launched after 5 seconds of the application launch, no matter you stop your application or device went in sleep state (due to RTC_WAKEUP option). You can read complete example code Scheduling activities, services and broadcasts #Android

Answer 3

或倒数秒，而不用使用日历或相对的电话时间..我自己做了一个类似的应用，由于电话时间关闭或重置等原因，它似乎减少了变异性...