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I am new to android and i have been analyzing the android source code to understand how the System services are implemented. My Question is am I able to create my own System Service and add it to the framework so that all the applications should be Able to access my service. Any comments/Code snippets would be helpful.
Thanks to the Replier in advance.
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Android services are system component which allows performing a longer-running operation while not interacting with the user. Just like Activities , Service runs on Main Thread and has a life cycle but unlike Activity , Services do not have a UI.
You declare a service in your app's Manifest, by adding a <service> element as a child of your <application> element. There's a list of attributes that you can use to control a service's behavior, but as a minimum you'll need to provide the service's name (android:name) and a description (android:description).
Starting a service You can start a service from an activity or other application component by passing an Intent to startService() or startForegroundService() . The Android system calls the service's onStartCommand() method and passes it the Intent , which specifies which service to start.
For a system service, more is needed. Essentially, at least for Android 2.3, the SystemServer.java must be extended so that the new service gets instantiated when the system_server starts.
Texas Instruments has kindly provided a nice example:
http://processors.wiki.ti.com/index.php/Android-Adding_SystemService
The CyanogenMod SystemServer.java has also code for dynamically loading system services as defined in the array "config_vendorServices" in config.xml (see core/res/res/values/config.xml), which I believe can be overwritten in the vendor or device directories. However, we haven't tried to use that ourselves, and I don't know if that is CyanogenMod specific or common to 2.3.[45].
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You can add your own service but there is no way to add system service, unless you can modify the framework source code.
System services are running in system_sever with system privilege, which allow those service can access system resource that normal application service can't.
This article explain in detail how the system service are implemented in Android. 
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