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Editorial Team
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Asked: 2026-05-24T19:17:48+00:00

I have an Android application which has the main UI thread, and several other

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I have an Android application which has the main UI thread, and several other worker threads which I have spawned using ASyncTask.

However, there is a scenario that I can produce every time in which I attempt to spawn a new thread with ASyncTask using task.execute(), and it does not call doInBackground(). The thread never seems to start. Then my application seems to spin for a little while, and then begins to hang.

Here are the threads I am using:
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And here is the memory usage on the device:

enter image description here

It does not look as though it is failing to spawn due to memory issues.

Is there some other underlying reason that I do not know of? Maximum number of threads? Is there any way for me to find out why it is not executing?

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1 Answer

  1. Editorial Team

    AsyncTask uses a ThreadPoolExecutor used internally with a core pool size of 5 and a LinkedBlockingQueue. In simpler terms: you can have atmost 5 AsyncTasks active at the same time. Additional tasks will be queued till one of the other AsyncTasks does not return from doInBackground().

    You may want to review your code to free up some AsyncTasks. If thats not possible, you can try to create a CustomAsyncTask class in your project based on the original AsyncTask code which can be found here. Try setting the CORE_POOL_SIZE variable to a higher value or using a SynchronousQueue.

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