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    <p>The Runtime.availableProcessors() doesn't seem to work correctly for all Android devices (for example, it only returns "1" on my dual-core Galaxy S II). There may be some confusion between physical CPUs, and virtual CPUs, aka Cores.</p> <p>The most reliable method I've found is <a href="http://makingmoneywithandroid.com/forum/showthread.php?tid=298&amp;pid=1663#pid1663" rel="nofollow noreferrer">described in this forum post</a>. Basically, you have to count the virtual CPU devices in /sys/devices/system/cpu/. This will work with dual-core and quad-core devices with no modifications.</p> <p>I've tested this method on my Galaxy S II (2 cores) and Asus Transformer Prime (4 cores) and it reports correctly. Here's some sample code (taken from <a href="https://stackoverflow.com/a/10377934/663469">my answer to this question</a>):</p> <pre><code>/** * Gets the number of cores available in this device, across all processors. * Requires: Ability to peruse the filesystem at "/sys/devices/system/cpu" * @return The number of cores, or 1 if failed to get result */ private int getNumCores() { //Private Class to display only CPU devices in the directory listing class CpuFilter implements FileFilter { @Override public boolean accept(File pathname) { //Check if filename is "cpu", followed by a single digit number if(Pattern.matches("cpu[0-9]", pathname.getName())) { return true; } return false; } } try { //Get directory containing CPU info File dir = new File("/sys/devices/system/cpu/"); //Filter to only list the devices we care about File[] files = dir.listFiles(new CpuFilter()); //Return the number of cores (virtual CPU devices) return files.length; } catch(Exception e) { //Default to return 1 core return 1; } } </code></pre>
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    1. POIs there any API that tells whether an Android device is dual-core or not?
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    1. COI would place `Runtime.availableProcessors()` as default return value.
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