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Background Location services for android

I have an android app that I am developing and I need to have a Service running that checks the user's location at a defined interval.
I've found other posts and Google's documentation, but I found them all very confusing, where people are saying different things.
If someone could please help me on this, I would really appreciate it :)

All you need to do create repetitive alarm using alarm manager.
https://developer.android.com/training/scheduling/alarms.html

Create Notification when my mobile it´s in a date

I´m trying to create a new Notification that will appear when a day has come.
For example: Today is 8 of September of 2014 and i want create a notification for tomorrow.
It´s like when your calendar reminds you something that you put a month ago
Could someone tell me how can i create a notification like the calendar when i´m in a specific day?
Thank a lot.
EDIT
Thanks you for all the answers, i found a tutorial of AlarmManager and it worked as you all said.

Try using AlarmManager in android
The Alarm Manager is intended for cases where you want to have your application code run at a specific time, even if your application is not currently running. For normal timing operations (ticks, timeouts, etc) it is easier and much more efficient to use Handler.
please refer this
https://developer.android.com/training/scheduling/alarms.html

How to create application which is display message in specific time and day in android

I am creating app which contain.
-> time like 2:30 AM
-> Repeat like sat,sun
User is dynamic add time and repeating value.For example we have 10 record with different value.
So how i can display message at particular time and schedule period.I think Alarm Manager and services is best.But i don't know how to used.
How can i trigger different alarm in particular day and time.
please give me some guideline.

yes. you have to use AlarmManager for it. Below is best link with example of AlarmManager http://www.techrepublic.com/blog/app-builder/use-androids-alarmmanager-to-schedule-an-event/2651

Finally done this task.
Using AlarmManager with services.
#chaitanya Thanks for your help.

Android Service get data from database on specific time

I have an app show my school timetable, now i trying to write a DashClock widget. I need to get current day subject from database on specific time like everyday 12am so i can publish the update to DashClock.
I check AlarmManager, but have no idea how to set the time for run automatically on 12am and how it access to database.
Any example or tutorial?
Please help, thanks in advance.

You can simply use AlarmManager. By using AlarmManager schedule your task on 12 am at repeating basis. And when AlarmManager Triggers you can perform the database operations.
There are plenty of examples out there. This SO answer can be a good start. you can also check this project. Followings are jsut some search results samples in google first page.
link1, link2, link3
I think from next time better search for your answer before posting.

Android scheduling or timer APIme

Pardon me if m asking some discussion based questions. I am completely new to android environment and I am developing an android based application wherein i need to apply some modification in messaging system for my project. therein i need to employ a timer facility for the outgoing messages where user could be able to time his message so that at that scheduled time, the sms should go automatically. I want to know which messaging API will help me in implementing so. I can sense that dis is not upto the mark question to be asked but i searched on every site but all work in vain. Hoping to get a positive reply from your side.

You should have a look at ScheduledExecutorService
i think this is what you are searching for. This service is able to execute tasks based on TimeUnits in the background.

You might also want to check out AlarmManager. You can use it to send a custom Intent at some time in the future. It might be better than other kinds of timers (depending on your situation), because it will cause the phone to wake up when the intent is delivered. Otherwise, your code might not run if the CPU is asleep.