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I have been reading Android documentation (AsyncTask, Thread) and vogella tutorial about this matter, but I have doubts yet.
For example, I want to send a message from an Android app to a server. And I would like this process to be responsive. What should I use?
I have seen examples where they create a new Thread for not block UI, but this way we don't have the progress of process, also you have to process the response within the Thread because the run() method doesn't returning anything.
AsyncTask seems better option than Thread, but I don't know what are the consequences of using an AsyncTask instead of a Thread.
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Thread can be triggered from any thread, main(UI) or background; but AsyncTask must be triggered from main thread. Also on lower API of Android(not sure, maybe API level < 11), one instance of AsyncTask can be executed only once. Long task in general.
Using Handlers you have the advantage of MessagingQueues , so if you want to schedule messages or update multiple UI elements or have repeating tasks. AsyncTask are similar, in fact, they make use of Handler , but doesn't run in the UI thread, so it's good for fetching data, for instance fetching web services.
service is like activity long time consuming task but Async task allows us to perform long/background operations and show its result on the UI thread without having to manipulate threads.
Service : is a component of android which performs long running operation in background, mostly with out having UI. Thread : is a O.S level feature that allow you to do some operation in the background.
Please read this blog
http://crazyaboutandroid.blogspot.in/2011/12/difference-between-android.html
and Details are:
Difference between Android Service,Thread,IntentService and AsyncTask
When to use ?
Service
Task with no UI, but shouldn't be too long. Use threads within service for long tasks.
Thread
- Long task in general.
- For tasks in parallel use Multiple threads (traditional mechanisms)
AsyncTask
- Small task having to communicate with main thread.
- For tasks in parallel use multiple instances OR Executor
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