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POAndroid HandlerThread stops working when device unplugged from USB cable
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  1. POAndroid HandlerThread stops working when device unplugged from USB cable
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    copied!<p>My application includes a Service that spawns a HandlerThread that periodically requests a location update from the LocationManager. Each time I receive a location updated I disable location updates, and send a delayed message to the Hander that will start updates again in the future:</p> <pre><code>public class VMLocator extends HandlerThread implements LocationListener { ... private final class VMHandler extends Handler { public VMHandler(Looper looper) { super(looper); } @Override public void handleMessage(Message msg) { if(MSG_START_LOCATION_UPDATES == msg.what) { startLocationUpdates(); } } } ... @Override public void onLocationChanged(Location location) { ... stopLocationUpdates(); // Schedule updates to start again in the future. Message msg = new Message(); msg.what = MSG_START_LOCATION_UPDATES; handler.sendMessageDelayed(msg, 5000); // &lt;-- Testing value. Will be much larger. ... } </code></pre> <p>I'm currently testing using a HTC Desire S handset running 2.3.3, developing with Eclipse. Everything works fine while the phone is connected via the USB cable to my development machine. However:</p> <ul> <li>If I start the app from Eclipse (either debug or run), things work fine until I unplug the USB cable, at which point my HandlerThread seems to stop.</li> <li>If I start the app from the phone itself, after disconnecting the USB cable, the service starts up but the thread doesn't seem to be running.</li> </ul> <p>Things to note:</p> <ul> <li>In either case above, if I plug the USB cable back in, it instantly starts working again.</li> <li>In either case above, Settings -> Applications -> Running Services always indicates that my <strong>Service is still running</strong>.</li> <li>I've sprinkled some debug Toasts around; as far as I can tell my Service is not being destroyed, but the HandlerThread's message queue ceases to process messages. </li> </ul> <p>I've tried running from the phone while disconnected and with USB debugging disabled with the same result. I'm sensing that there is something simple in the docs I've missed, because I thought that running/debugging from Eclipse installed the app, and the app should function normally regardless of whether the USB cable is plugged in or not. </p>
 

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