android - set date and time from respective pickers to set alarm -

i preparing app "to-do list" in user sets alarm task. problem don't know how set alarm using date , time pickers.

the working need user first selects date , time. date , time used set notification on specified date , time. , after clicking on notification, activity contains whole list starts. in activity, once task marked finish, alarm must removed specific date , time.

please me. trying first time. please me learning this.

ps: work i've done till is, have prepared activity takes necessary details task such task brief, task priority, task date task time, , storing in database. can mark task done / undone. work i'm remaining setting notification task.

find difference between current time , time @ work id done in milliseconds , set alarm.

alarmmanager am=(alarmmanager)context.getsystemservice(context.alarm_service);     intent intent = new intent(context, alarmmanagerbroadcastreceiver.class);     pendingintent pi = pendingintent.getbroadcast(context, 0, intent, 0);             am.setrepeating(alarmmanager.rtc_wakeup, system.currenttimemillis(), 1000 * diffinmillis , pi); 

hope helps