java - How to Realize an Update Service is Running in the Background? -

i'm working on app android os displays data. ensure data up-to-date, required app fetches updates remote server time time. data not change often, update should carried out once per week. want give user ability choose weekday , daytime of update (and optionally disable feature completely).

the thing is: update should carried out when user not using phone @ moment, when phone sleeping , when phone has been rebooted , app hasn't been started yet.

the first thing thought of remote service starts @ system boot, determines time when run update, sets timer , waits/sleeps timer fire.

now, told should rather use alarm timers or kind of handlers... more read topic, more ways seem exist.

now, i'm bit lost method best me... here need:

i want execute code @ time specified.

this timer used trigger execution of code 7 days in future. (i.e., every week @ given weekday , time)

the code should run without waking phone if "sleeping" (screen dimmed).

when running code, no activity should started. i.e. no app pops on screen.

the code executed should fetch data internet. if @ time no internet connection available, timer should set sleep 30 minutes , try again.

after completing code execution, timer set next interval, 7 days later.

the timer should started @ system boot, e.g., if reboot phone, timer should determine next date execute code , schedule timer. has work without user interaction! (i.e. without app being started itself)

when "sleeping", thread/service/timer/whatsoever should not consume system resources if possible...

need pretty simple unix cronjob.

i think here knows "newsrob" android? want realize pretty same newsrob-updateservice.

android service + broadcast receiver + alarm service solve purpose -

your service invoked broadcast receiver , in broadcast receiver should register various events - boot_receiver , action_user_present , take care of alarm reset , update task.

thanks.