Android :: Running Multiple AsyncTasks At The Same Time - Not Possible?

Nov 1, 2010

I'm trying to run two AsyncTasks at the same time. (Platform is Android 1.5, HTC Hero.) However, only the first gets executed.

Here's a simple snippet to describe my problem:

CODE:................

The output I expect is:

onCreate() is done.
bar bar bar
foo foo foo
bar bar bar
foo foo foo

And so on. However, what I get is:

onCreate() is done.
bar bar bar
bar bar bar
bar bar bar

The second AsyncTask never gets executed. If I change the order of the execute() statements, only the foo task will produce output.

Am I missing something obvious here and/or doing something stupid? Is it not possible to run two AsyncTasks at the same time?

I realized the phone in question runs Android 1.5, I updated the problem descr. accordingly. I don't have this problem with an HTC Hero running Android 2.1.

Android :: Running multiple AsyncTasks at the same time - not possible?


Android :: Same Activity Called Twice - Multiple AsyncTasks?

May 8, 2010

I have three simultaneous instances of an AsyncTask for download three files. When two particular ones finish, at the end of onPostExecute() I check a flag set by each, and if both are true, I call startActivity() for the next Activity.

I am currently seeing the activity called twice, or something that resembles this type of behavior. Since the screen does that 'swipe left' kind of transition to the next activity, it sometimes does it twice (and when I hit back, it goes back to the same activity). It's obvious two versions of the activity that SHOULD only get called once are being put on the Activity stack.

Could this be from both onPostExecute()s executing simultaneously and both checking the flags each other set at the exact same time? This seems extremely unlikely since two processes would have to be running line-by-line in parallel...

A lot removed from this question since I was way off in what I thought was wrong. Nonetheless I found the answer here quite useful, so I have edited the question to reflect the useful parts.

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I am replacing the multithreaded code in my app with the AsyncTask from 1.5. I found that two AsyncTasks do not work concurrently. I investigated a bit and found a workaround; I would like second opinion if my solution is right. OR if there is a better solution.

AsyncTask allows the app to do a task on a thread other than the UI thread. But IIUC, it only provides a single thread on which a queue of tasks is performed. Therefore, if one of the task is to wait on some event (n/w or sleep) then all other tasks will wait for it to finish.

To elaborate with the coding example: <code>

public class MyTask extends AsyncTask<...> { ... }

On the UI thread execute two tasks MyTask mt1 = new MyTask().execute(args);

MyTask mt2 = new MyTask().execute(args); </code>

In the above code both the execute calls will return immediately and free up the UI thread; however mt1 will be executed first and mt2 will have to wait until mt1 finishes.

Thanks to the android's open source, we can see implementation of AsyncTask. http://google.com/codesearch/p?hl=en&sa=N&cd=2&ct=rc#uX1GffpyOZk/core...

I copied AsyncTask.java as UserTask.java in my project and changed the value of CORE_POOL_SIZE to 5. This makes the thread pool to use 5 threads to multiplex the queued AsyncTasks. This indeed solved my problem. Now if mt1 blocks on a sleep; mt2 goes ahead and finishes its job.

Here are some questions for those who know more about AsyncTask implementation:

Is this work-around right? If yes, can the CORE_POOL_SIZE be made configurable in future, via an API call? Is there a solution by which multiple thread pools can be used?

Let me add that, I am aware that this is a phone and not a web server - I am not using 10s of threads to do network I/O. However a single thread is not sufficient for my app either.

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This is what I have,say:

CODE:..............

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CODE:...........................

Terminal 2:

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