[android-developers] Re: Multiple Threads

2011-05-04 Thread Stefan 
This sounds a little bit diffecult to I'm not very experienced in
writing my own ASyncTask, or creating a custum handler.
Isn't it  possible to create a new thread withing the asynchtask.  So
the big task is plitted up in several smaller tasks.


On 4 mei, 16:27, Satya Komatineni satya.komatin...@gmail.com wrote:
 An AsyncTask may be doing its work with a single worker thread. You
 may want to download the sourcecode of AsyncTask and  alter it so that
 a pool of threads can do the work to speed up.

 This is just thinking aloud.

 Or write your own handler that spawns multple threads and have the
 handler report back to the main thread much like the async task.

 Satya









 On Wed, May 4, 2011 at 10:03 AM, Stefan stefankru...@hotmail.com wrote:
  I'm making a app which got it's data from parsing a website, and I
  have to download around 100 webpages.
  This is a time consuming task, so I created a AsyncTask for
  downloading the data, so I can show a Loading message on the UI
  Thread.

  Only problem is, that the 100 webpages are now downloaded after each
  other. Is there a way to download the webpages at the same time? I
  tried to make a new thread in the asynctask, but I only got a Can't
  create handler inside thread that has not called Looper.prepare()
  eror...

  What's the best way to do this usually?

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[android-developers] Re: Multiple Threads

2011-05-04 Thread Stefan 
The problem at this moment with the app is that the retrieval of the
html code from the website takes a lot of time.
When you start the app at this moment, you'ill have to wait 3 minutes
for loading the website.
That's not very user friendly, and I guess that downloading just a
little bit html cannot take such a long time.

The website is sometimes also a little bit slow, so I thought that the
long download time maybe is caused by the server, which needs time to
react on my request.
And I guess, when there are more requests at the same time to the
sever (for example 10 threads).   the waiting time will decrease a
lot.

I'm not if what I said is correct,  but it sounds logically for me.


On 4 mei, 17:09, TreKing treking...@gmail.com wrote:
 On Wed, May 4, 2011 at 9:03 AM, Stefan stefankru...@hotmail.com wrote:
  Only problem is, that the 100 webpages are now downloaded after each other.
  Is there a way to download the webpages at the same time?

 First question: what is the purpose of doing them all at once?

 --- 
 --
 TreKing http://sites.google.com/site/rezmobileapps/treking - Chicago
 transit tracking app for Android-powered devices

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Re: [android-developers] Re: Multiple Threads

2011-05-04 Thread Dianne Hackborn 
This isn't really an Android-specific question -- you will probably get good
answers just looking for ways in Java to do concurrent HTTP requests.

On Wed, May 4, 2011 at 11:22 AM, Stefan stefankru...@hotmail.com wrote:

 The problem at this moment with the app is that the retrieval of the
 html code from the website takes a lot of time.
 When you start the app at this moment, you'ill have to wait 3 minutes
 for loading the website.
 That's not very user friendly, and I guess that downloading just a
 little bit html cannot take such a long time.

 The website is sometimes also a little bit slow, so I thought that the
 long download time maybe is caused by the server, which needs time to
 react on my request.
 And I guess, when there are more requests at the same time to the
 sever (for example 10 threads).   the waiting time will decrease a
 lot.

 I'm not if what I said is correct,  but it sounds logically for me.


 On 4 mei, 17:09, TreKing treking...@gmail.com wrote:
  On Wed, May 4, 2011 at 9:03 AM, Stefan stefankru...@hotmail.com wrote:
   Only problem is, that the 100 webpages are now downloaded after each
 other.
   Is there a way to download the webpages at the same time?
 
  First question: what is the purpose of doing them all at once?
 
 
 ---
 --
  TreKing http://sites.google.com/site/rezmobileapps/treking - Chicago
  transit tracking app for Android-powered devices

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Android framework engineer
hack...@android.com

Note: please don't send private questions to me, as I don't have time to
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[android-developers] Re: Multiple Threads

2011-05-04 Thread Stefan 
To do concurrent HTTP request I guess threads are the way to do that?
Creating a thread within a thread results here in an   Can't create
handler inside thread that has not called Looper.prepare()error.
And I cannot find another way without multiple threads.


On 4 mei, 17:27, Dianne Hackborn hack...@android.com wrote:
 This isn't really an Android-specific question -- you will probably get good
 answers just looking for ways in Java to do concurrent HTTP requests.









 On Wed, May 4, 2011 at 11:22 AM, Stefan stefankru...@hotmail.com wrote:
  The problem at this moment with the app is that the retrieval of the
  html code from the website takes a lot of time.
  When you start the app at this moment, you'ill have to wait 3 minutes
  for loading the website.
  That's not very user friendly, and I guess that downloading just a
  little bit html cannot take such a long time.

  The website is sometimes also a little bit slow, so I thought that the
  long download time maybe is caused by the server, which needs time to
  react on my request.
  And I guess, when there are more requests at the same time to the
  sever (for example 10 threads).   the waiting time will decrease a
  lot.

  I'm not if what I said is correct,  but it sounds logically for me.

  On 4 mei, 17:09, TreKing treking...@gmail.com wrote:
   On Wed, May 4, 2011 at 9:03 AM, Stefan stefankru...@hotmail.com wrote:
Only problem is, that the 100 webpages are now downloaded after each
  other.
Is there a way to download the webpages at the same time?

   First question: what is the purpose of doing them all at once?

  ---
  --
   TreKing http://sites.google.com/site/rezmobileapps/treking - Chicago
   transit tracking app for Android-powered devices

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 --
 Dianne Hackborn
 Android framework engineer
 hack...@android.com

 Note: please don't send private questions to me, as I don't have time to
 provide private support, and so won't reply to such e-mails.  All such
 questions should be posted on public forums, where I and others can see and
 answer them.

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[android-developers] Re: Multiple Threads

2011-05-04 Thread Streets Of Boston 
AsyncTasks are not threads.
They are chunks of work (like getting a web-document) that are executed on a 
pool of (background) threads.

Read the documentation of AsyncTask carefully. Figure out a way to have a 
pool of more than one background threads (happens 'automatically' for 
Android OS versions Donut -- Gingerbread, you need to do some extra work on 
Honeycomb). Then create a bunch of AsyncTasks at the same time on your UI 
thread (e.g. in some on() method call-back on in your onClick methods, 
etc) and call execute on them.

Then the bunch of AsyncTasks will be executed on the pool of background 
threads.
Be sure on implement onPostExecute to update your UI.

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[android-developers] Re: Multiple Threads

2011-05-04 Thread lbendlin 
and once you have done all that you may notice no performance gain at all 
because all along the bottleneck was you phone's data connection speed...

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[android-developers] Re: multiple threads problem, possible memory leak

2010-12-12 Thread Rustam Kovhaev 
scratch that, I am simply tired for today ^)

//service on destroy
public void onDestroy() {
handler.getLooper().quit();
}

2010/12/13 Rustam Kovhaev rkovh...@gmail.com

 Hello there,

 I have a service from which I constantly call another service(lets call it
 B service),
 the problem is that in B service I have looper which processes
 two Runnables and when I stop B service, thread stays running, wouldn't die
 and when I call B service again I have  two thread already

 in 5 min time I have about 30 threads, thread.interrupt doesn't seem to be
 working

 --
 Regards,
 Rustam Kovhaev
 http://libertadtech.com




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[android-developers] Re: multiple threads problem, possible memory leak

2010-12-12 Thread fernando 
Hi
It might be the case to use a stick service and keep the thread
running. Refer the SyncManager service from the AOSP email
application. Hope it helps

On Dec 12, 2:31 pm, Rustam Kovhaev rkovh...@gmail.com wrote:
 scratch that, I am simply tired for today ^)

 //service on destroy
 public void onDestroy() {
 handler.getLooper().quit();

 }

 2010/12/13 Rustam Kovhaev rkovh...@gmail.com





  Hello there,

  I have a service from which I constantly call another service(lets call it
  B service),
  the problem is that in B service I have looper which processes
  two Runnables and when I stop B service, thread stays running, wouldn't die
  and when I call B service again I have  two thread already

  in 5 min time I have about 30 threads, thread.interrupt doesn't seem to be
  working

  --
  Regards,
  Rustam Kovhaev
 http://libertadtech.com

 --
 Regards,
 Rustam Kovhaevhttp://libertadtech.com

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