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    <p>Exactly right. <a href="http://java.sun.com/javase/6/docs/api/java/lang/Thread.html#start%28%29" rel="noreferrer">From the documentation</a>:</p> <blockquote> <p>It is never legal to start a thread more than once. In particular, a thread may not be restarted once it has completed execution.</p> </blockquote> <p>In terms of what you can do for repeated computation, it seems as if you could use <a href="http://java.sun.com/javase/6/docs/api/javax/swing/SwingUtilities.html#invokeLater%28java.lang.Runnable%29" rel="noreferrer">SwingUtilities invokeLater method</a>. You are already experimenting with calling <code>run()</code> directly, meaning you're already thinking about using a <code>Runnable</code> rather than a raw <code>Thread</code>. Try using the <code>invokeLater</code> method on just the <code>Runnable</code> task and see if that fits your mental pattern a little better.</p> <p>Here is the example from the documentation:</p> <pre><code> Runnable doHelloWorld = new Runnable() { public void run() { // Put your UI update computations in here. // BTW - remember to restrict Swing calls to the AWT Event thread. System.out.println("Hello World on " + Thread.currentThread()); } }; SwingUtilities.invokeLater(doHelloWorld); System.out.println("This might well be displayed before the other message."); </code></pre> <p>If you replace that <code>println</code> call with your computation, it might just be exactly what you need.</p> <p>EDIT: following up on the comment, I hadn't noticed the Android tag in the original post. The equivalent to invokeLater in the Android work is <code>Handler.post(Runnable)</code>. From its javadoc:</p> <pre><code>/** * Causes the Runnable r to be added to the message queue. * The runnable will be run on the thread to which this handler is * attached. * * @param r The Runnable that will be executed. * * @return Returns true if the Runnable was successfully placed in to the * message queue. Returns false on failure, usually because the * looper processing the message queue is exiting. */ </code></pre> <p>So, in the Android world, you can use the same example as above, replacing the <code>Swingutilities.invokeLater</code> with the appropriate post to a <code>Handler</code>.</p>
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    1. POIs it legal to call the start method twice on the same Thread?
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    1. COThe OP is asking about threading on Android, which does not include the SwingUtilities.
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      1. USAustyn Mahoney
    2. CO@Austyn, you're right. I added the remarks about Handler.post() to illustrate the parallel Android code.
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    3. COAnother way if you are just trying to update your UI is to use `RunOnUIThread(Runnable)` or `View.post(Runnable)` instead of creating your own Handler. These will run the runnable on the main thread allowing you to update the UI.
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