问题
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
.
回答1:
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
回答2:
All other answers here are not complete, there is a big difference between AsyncTask and Thread, i.e.
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.
For more information read Difference between Android Service, Thread, IntentService and AsyncTask
In general
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
回答3:
in general using of 2 this features are equivalent, but AsyncTask is more simple in terms of integration with GUI
回答4:
- I would prefer to Use Async Task as it will let you know when the
background process
gets started and over and when can Iparse
the response. - Async has methods like
onPreExecute
andonPostExecute
which will allow us to do tasks before and after calling the background tasks.
回答5:
AsyncTask enables proper and easy use of the UI thread. This class allows to perform background operations and publish results on the UI thread without having to manipulate threads and/or handlers.
You can control its own functions
doInBackground(Params... params), onCancelled(), onPostExecute(Result result), onPreExecute(), nProgressUpdate(Progress... values), publishProgress(Progress... values)
回答6:
AsyncTask enables proper and easy use of the UI thread.
- from Developer.
The thing is - AsyncTask is a special kind of Thread - one which is a GUI thread, it works in the background and also let's you do something with the GUI - it is basically "pre-programmed" for you with functions onPreExecute(), do inBackground(), onPostExecute()
.
In order to make Thread
work that way, you have to write a loooot of code.
来源:https://stackoverflow.com/questions/11758629/real-difference-between-asynctask-and-thread