what is need /advantage of services in android over multithreading

Can you explain to me:

What is the need or advantages of services开发者_JAVA技巧 in Android over multithreading?

Benefits of Services over multithreading:

• When running low on memory and needing to kill existing processes, the priority of a process hosting the service will be the higher.
• You don't need an Activity to run.
• Services can be invoked through intents.
• You can use Permissions.

Some pitfalls:

• It runs on the ui thread.
• Use stopSelf() after you have finished your work.

If you want to execute a long operation and do not want to interrupt it, you should use services. By using multi-threading operating system can kill your application easily, but if you register for a service, then it will wait for finishing that operation.

To sum up, you should use a service for critical operations like uploading photo, and you can use multi-threading where interrupting the operation is not critical.