android - How to retrive date and time from database and create notification on that particular date -

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i want create reminder.i using below code generate notification @ particular time , date set user.

public class mainactivity extends activity { timepicker timepicker; datepicker datepicker; button button1;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      button1 = (button) findviewbyid(r.id.button1);       button1.setonclicklistener(new view.onclicklistener() {          @override         public void onclick(view arg0) {              timepicker = (timepicker) findviewbyid(r.id.timepicker1);                 datepicker = (datepicker) findviewbyid(r.id.datepicker1);                     alarmmanager alarmmanager = (alarmmanager) getsystemservice(alarm_service);                       calendar calendar = calendar.getinstance();                        calendar.set(calendar.year, datepicker.getyear());                 calendar.set(calendar.month, datepicker.getmonth());                 calendar.set(calendar.day_of_month, datepicker.getdayofmonth());                                  calendar.set(calendar.hour_of_day, timepicker.getcurrenthour());                 calendar.set(calendar.minute, timepicker.getcurrentminute());                 calendar.set(calendar.second, 0);                  intent inn = new intent(mainactivity.this,alaramdetail.class);                 pendingintent displayintent = pendingintent.getactivity(                         getbasecontext(), 0,inn, 0);                        alarmmanager.set(alarmmanager.rtc_wakeup,                          calendar.gettimeinmillis(), displayintent);            }     });  } }

below alaramdetail class have code genrating notification.

public class alaramdetail extends activity {  @suppresswarnings("deprecation") @override protected void oncreate(bundle savedinstancestate) {     // todo auto-generated method stub     super.oncreate(savedinstancestate);     setcontentview(r.layout.detail);     notificationmanager nm = (notificationmanager)getsystemservice(context.notification_service);     notification notification = new notification(android.r.drawable.stat_notify_more, "this important notification",system.currenttimemillis());     string title = "pay attention";     string detail = "this implortant";     intent intent = new intent(alaramdetail.this,alaramdetail.class);     finish();     pendingintent pintent = pendingintent.getactivity(alaramdetail.this, 0,intent ,0 );      notification.setlatesteventinfo(alaramdetail.this, title, detail, pintent);      notification.flags=notification.flag_auto_cancel;     notification.defaults|=notification.default_sound;     notification.defaults|=notification.default_lights;     notification.defaults|=notification.default_vibrate;     nm.notify(1, notification); }     }

above code working correctly. after doing have created database store multiple date , time inputted user.database store date , time string.now want generate notification @ particular date , time stored in database.i dont know how pass date , time database calendar.set(int field,int value) commands.i think can use cursor retrieving date , time dont know value pass in , args.my database has 3 columns name,date,time.

also better storing time in milliseconds long in database...it give better performance...

after retrieving data set time using code

   calendar calender = calendar.getinstance();    calender.settimeinmillis(timeinmilli);

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