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POHow can I keep a connection thread alive? (Do I need to use a daemon?)
 

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  1. POHow can I keep a connection thread alive? (Do I need to use a daemon?)
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    <p>My Android application uses a thread to listen for a sockets connection from a PC connected via USB. At some point after the PC opens the connection (in response to some user driven event) I want to send some data over it.</p> <pre><code>public void onCreate(Bundle savedInstanceState) { // SNIP: stuff and nonsense connection = new Thread(new ServerThread()); connection.start(); } public boolean onTouchEvent(MotionEvent event) { // SNIP: decide what to do; create string 'coordString' Message coordMsg = coordHandler.obtainMessage(); Bundle coordMsgData = new Bundle(); coordMsgData.putString("coords", coordString); coordMsg.setData(coordMsgData); if(coordHandler!=null) { coordHandler.sendMessage(coordMsg); } return false; } public class ServerThread extends Thread { public void run() { this.setName("serverThread"); Looper.prepare(); coordHandler = new Handler() { @Override public void handleMessage(Message msg) { Log.v(INNER_TAG,"here"); } }; // SNIP: Connection logic here Looper.loop(); } }. </code></pre> <p>For ages I was scratching my head wondering why I never saw the value of <code>INNER_TAG</code> appear in my logs after touch events. I could use log-debugging to trace the execution into the <code>coordHandler!=null</code> block, but the handler never seemed to fire.</p> <p>Then it struck me: the thread is probably exiting after completing the connection. <strong>D'uh!</strong> Not quite sure what I thought was happening before, but I'll blame it on a belief that <code>Loop</code> was doing something magical.</p> <p>So my question is: How can I keep my thread running? The official <a href="http://developer.android.com/reference/java/lang/Thread.html" rel="nofollow">Android dev reference on threads</a> briefly mentions that</p> <blockquote> <p>A Thread can also be made a daemon, which makes it run in the background.</p> </blockquote> <p>This naturally made my *nix senses tingle. (Incidentally, have you seen the new Spiderman film yet? It's pretty good.) Is daemonisation the answer? Or have I completely lost the plot?</p>
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