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copied!<p>First, I would suggest that if a user clicked on something he should see some immediate result, in your case, if the button action needs to wait for something add a circle loading animation on the button immediately to signal to the user the action will happen shortly.</p> <p>Now for the action itself, if there is only one (or few) such possible actions that take place after one (or few) possible background process, I would have the button <strong>synchronously</strong> raise a flag (maybe via a persistent class member) and have the long process <strong>synchronously</strong> check for that flag after it finishes it's process and perform the requested action on finishing.</p> <p>Another possible option if to use wait and notify to have the button code wait for the process to finish, this is usually considered a very high performance solution in Java:</p> <p>for example (ignore typos, this is on-the-spot):</p> <pre><code>button.setOnClickListener(new OnClickListener() { public void onClick(View v) { v.post(new Runnable() { @Override public void run() { synchronized (lockObject) { try { lockObject.wait(); doAction(); } catch (InterruptedException e) {} } } } } } </code></pre> <p>Then have the long process <code>notify</code> when it finishes.</p> <p>Note that <code>new Runnable()</code> doesn't create a new thread, it simply adds a <code>Runnable</code> to the <code>View</code>'s thread queue</p> <p>As suggested by mice, the button onClick handler should check if the process is not currently running, and if so just perform the action immediately.</p> <p>This way you don't need to create a new thread (or an AsyncTask which is actually a pool of threads)</p>

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