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POCalledFromWrongThreadException using Service IPC connection
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8205741
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8205836
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1
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2011-11-20T23:41:51.443
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2011-11-21T01:08:41.873
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2011-11-21T01:08:41.873
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Body
I'm using the tutorial <a href="http://mindtherobot.com/blog/37/android-architecture-tutorial-developing-an-app-with-a-background-service-using-ipc/" rel="nofollow">here</a> to develop a Service that is (right now) just running a <code>TimerTask</code> to do <code>System.out.println("tick")</code> every second. My code is exactly like the code on the site, aside from some name changes. Everything works (the Service runs, outputs "tick") if I don't try to pass a String from the Service to the Activity. What I'm trying to accomplish is to get a TextView in the main Activity to be updated with a String received from the Service. I have an <code>append(String)</code> method working fine that will update the TextView with new text. So in my Service's <code>TimerTask</code> I've added <code>listener.handleMessage("tick")</code> and my Activity implements the listener functionality: <pre><code> public void handleMessage(String msg) throws RemoteException { append(msg); } </code></pre> When I run the application, <code>System.out</code> shows a "tick", then a stacktrace with the <code>CalledFromWrongThreadException</code>, pointing to the <code>append()</code> method as the source of the problem. I know there's a few questions about this Exception, but most of them concern <code>Thread</code> and <code>Handler</code> issues; I couldn't find anything about Services. Anyone know if this is possible? <h1>Solution</h1> Extend Runnable: <pre><code>class MyRunnable implements Runnable { private String msg; public MyRunnable(String msg) { this.msg = msg; } public void run() { appendNewline(msg); } } </code></pre> and replace the callback with a call to global Handler: <pre><code> public void handleMessage(String msg) throws RemoteException { handler.post(new MyRunnable(msg)); } </code></pre>
Tags
<android><service><thread-safety><ipc><aidl>
Title
CalledFromWrongThreadException using Service IPC connection
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