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Editorial Team
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Asked: 2026-06-13T12:27:53+00:00

I am testing an application where we have a list view with list of

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I am testing an application where we have a list view with list of images retrieved over network. When i run the application on android device 2.3.3 (WIFI speed 512 KBPS) and check the DDMS (Thread Viewer), the number of threads keeps increasing till 50 from 25. But when i test the same application on device 4.0 (WIFI speed 5 MBPS), number of threads did not increase.

Can anyone help me understand why this is happening ? Is it due to android OS difference or any other reason ?

Thanks in advance.

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1 Answer

  1. Editorial Team

    Are you useing AsyncTask. After Android 3.0, the default behavior of AsyncTask is execute in a single thread using SERIAL_EXECUTOR.

    If you want AsyncTask run concurrently on any system version, you may use this code.

    AsyncTask task = new YourTask();
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.GINGERBREAD_MR1) {
    task.execute(params);
} else {
    task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, params);
}

    Pre OS 1.6 – Multiple Async Tasks gets executed in sequence.
    OS 1.6 till OS 2.3 – Async Tasks run in parallel.
    From 3.0 – Again, Async Tasks gets executed in sequence.

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