It comes from the use of a thread pool. It's as meant to be :) On Wed, Nov 11, 2009 at 11:44 AM, dadical <[email protected]> wrote: > One strange thing that I've seen in my usage of AsycTask is that the > Thread associated with an AsyncTask seems to live on after the task > has completed. It appears to be in some kind of idle/finalized > state, but the resources associated with the Thread itself remain > visible in the debugger. As far as I can tell, the task has completed > and exited normally. Subsequent invocations of the task seem to > create a new thread in the process. > > Is this some kind of optimization? A leak? A misuse of AsyncTask? > I've never spent a huge amount of time on figuring it out, as the use > case for me was fairly fringe, but I've wondered about it... > > On Nov 11, 11:25 am, Romain Guy <[email protected]> wrote: >> Please consider the implications of this: does it even make sense to >> have 20+ threads (on a single CPU device) updating the UI at once? >> That is NOT the purpose of AsyncTask. Also, since Donut, the limit of >> enqueued tasks in AsyncTask is 128, not 20. So AsyncTask has a maximum >> of 10 threads running concurrently and can hold up to 128 tasks >> waiting for a thread to be freed in the pool. So basically AsyncTask >> does exactly what you are trying to do here. >> >> >> >> >> >> On Wed, Nov 11, 2009 at 1:02 AM, Atif Gulzar <[email protected]> wrote: >> > Android has a limit to rum at MAX 20 concurrent AsyncTask. To handle this >> > limit I created a AsyncTaskPool.java utility. Its not a pool in true sense >> > but a kind of scheduler. I am posting it here for your comments and it may >> > help others. >> >> > import java.util.ArrayList; >> >> > import android.os.AsyncTask; >> >> > public class AsyncTaskPool >> > { >> >> > private int poolSize; >> > private ArrayList<AsyncTask> currentTasks = new ArrayList<AsyncTask>(); >> > private ArrayList<Object> pendingTasks = new ArrayList<Object>(); >> >> > /** >> > * @param poolSize >> > * : it should be less than 20. As Android only supports >> > max. >> > 20 concurrent Asynch tasks. >> > */ >> > public AsyncTaskPool(int poolSize) >> > { >> > this.poolSize = poolSize; >> > } >> >> > public int getPoolSize() >> > { >> > return poolSize; >> > } >> >> > public boolean addTask(AsyncTask asyncTask, Object... params) >> > { >> >> > if (currentTasks.size() < poolSize) >> > { >> > currentTasks.add(asyncTask); >> > if (params != null) >> > asyncTask.execute(params); >> > else >> > asyncTask.execute(); >> > } >> > else >> > { >> > Object[] task = new Object[2]; >> > task[0] = asyncTask; >> > task[1] = params; >> >> > pendingTasks.add(task); >> > } >> >> > return true; >> > } >> >> > public boolean removeTask(AsyncTask task) >> > { >> > if(currentTasks.contains(task)) >> > { >> > currentTasks.remove(task); >> > return true; >> > } >> > return false; >> > } >> >> > //Add this method in the onPostExecute method of AsyncTask >> > public boolean removeAndExecuteNext(AsyncTask atask) >> > { >> > removeTask(atask); >> > if (pendingTasks.size()>0 && currentTasks.size()<poolSize) >> > { >> > Object [] task = (Object []) pendingTasks.get(0); >> > pendingTasks.remove(task); >> >> > addTask((AsyncTask)task[0], (Object[])task[1]); >> >> > } >> >> > return false; >> > } >> >> > } >> >> > -- >> > Best Regards, >> > Atif Gulzar >> >> > I ◘◘◘◘ Unicode, ɹɐzlnƃ ɟıʇɐ >> >> > -- >> > You received this message because you are subscribed to the Google >> > Groups "Android Developers" group. >> > To post to this group, send email to [email protected] >> > To unsubscribe from this group, send email to >> > [email protected] >> > For more options, visit this group at >> >http://groups.google.com/group/android-developers?hl=en >> >> -- >> Romain Guy >> Android framework engineer >> [email protected] >> >> Note: please don't send private questions to me, as I don't have time >> to provide private support. All such questions should be posted on >> public forums, where I and others can see and answer them- Hide quoted text - >> >> - Show quoted text - > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en >
-- Romain Guy Android framework engineer [email protected] Note: please don't send private questions to me, as I don't have time to provide private support. All such questions should be posted on public forums, where I and others can see and answer them -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
