What
are services?
A service
is a component which runs in the background without direct interaction with the
user. As the service has no user interface, it is not bound to the lifecycle of
an activity.
Services are used for repetitive and potentially long running
operations, i.e., Internet downloads, checking for new data, data processing,
updating content providers and the like.
Services run with a higher priority than inactive or invisible
activities and therefore it is less likely that the Android system terminates
them. Services can also be configured to be restarted if they get terminated by
the Android system once sufficient system resources are available again.
It is possible to assign services the same priority as foreground
activities. In this case it is required to have a visible notification active
for the related service. It is frequently used for services which play videos
or music.
Android's Open Handset Alliance enables high standards to
efficiently function on numerous of mobile devices that run Android operating
systems. Learn Android training by
experts.
Services and background
processing
By default, a service runs in the same process as the main thread of
the application.
Therefore, you need to use asynchronous processing in the service to
perform resource intensive tasks in the background. A commonly used pattern for
a service implementation is to create and run a new
Thread in the service to perform the processing in the background and then
to terminate the service once it has finished the processing. Android applications
are mostly developed in JAVA programming (Learn JAVA training by Learn IT Training from experts).
Services which run in the process of the application are sometimes
called local services.
Platform service and
custom service
The Android platform provides and runs predefined system services
and every Android application can use them, given the right permissions. These
system services are usually exposed via a specific Manager class. Access to
them can be gained via the
getSystemService() method. The Context class defines several
constants for accessing these services.
An Android application can, in addition to consuming the existing
Android platform services, define and use new services. Defining your custom
services allows you to design responsive applications. You can fetch the
application data via it and once the application is started by the user, it can
present fresh data to the user.
A service is a
component that runs in the background to perform long-running operations
without needing to interact with the user and it works even if application is
destroyed. A service can essentially take two states:
A service has life cycle callback methods that you can implement to
monitor changes in the service's state and you can perform work at the
appropriate stage. To create a service, you create a Java class that extends
the Service base class or one of its existing subclasses. The Service base class defines various
callback methods and the most important are given below. You don't need to
implement all the callbacks methods. However, it's important that you
understand each one and implement those that ensure your app behaves the way
users expect.
Learn
IT Training
Learn IT Training is a comprehensive repository for online and
offline courses offering high quality state-of-the-art IT and Business related
e-learning trainings and courses apart from SAP training modules. It is one of the best global online training portals
for the students. We provide trainings throughout USA,
UK, Australia, UAE, Canada, Saudi Arabia, New Zealand, India and Many other
Countries with industry experts.
Register for a free demo with us Android
training at: www.learnittraining.com/student-registration
For more details visit:
Visit:
www.learnittraining.com
Email: contact@learnittraining.com
Phone: INDIA +91 9912989639, USA +12108585008
Comments
Post a Comment