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POAndroid: ServerSocket.accept() randomly freezes
 

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  1. POAndroid: ServerSocket.accept() randomly freezes
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    <p>I have a <code>WebView</code> that is fed from a background thread via a <code>ServerSocket</code> on localhost. This works very well, but sometimes the background thread randomly stops accepting requests ("Web page not available"). After some time, it works again without any changes, that is, without restarting the thread or the socket or calling <code>accept()</code> again.</p> <p><strong>EDIT 2:</strong> Further investigation showed that <code>WebView</code> seems to have a (separate?) timeout value for localhost connections that is so small that sometimes the server thread doesn't get a chance to handle the request. As a workaround, I can reload the page when <code>WebClient.onReceivedError</code> is invoked, which eventually loads the page. Anyone having the same problem?</p> <p>When I open the debugger, I can see that the server thread is still running properly and is waiting (blocked) in the <code>ServerSocket.accept()</code> method (or, more precisely, in <code>OSNetworkSystem.accept(...)</code>). However, <code>accept()</code> doesn't seem to receive the incoming request.</p> <p>There is is nothing special in my code:</p> <pre><code>ServerSocket serverSocket = new ServerSocket(port); serverSocket.setSoTimeout(0); while (!shutdown) { Socket socket = null; try { socket = serverSocket.accept(); // Parse request and create response } catch (Exception e) { // ... } finally { // ... close socket } } </code></pre> <p>I use the same code on Windows/Mac and have never experienced any such problems.</p> <p>This seems to me like a bug in Android, perhaps related to power management optimizations. Any clues?</p> <p><strong>EDIT:</strong> The problem does not occur on Android 2.x, only on Android 3.1 (Samsung Galaxy Tab 10.1).</p>
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    1. USStefan Mücke
    1. USStefan Mücke
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    1. COWhat contains the code in your question? Are you running that serverSocket from inside an Activity?
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      1. USelevine
    2. CO@elevine: The serverSocket runs in another thread, started from inside an Activity. It does not run as a service.
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      1. USStefan Mücke
    3. COCan you show more of your Activity code? How is the thread created and where do you start it?
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      1. USelevine
 

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