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POAndroid: Handling back button during asynctask
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  1. POAndroid: Handling back button during asynctask
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    copied!<p>I have an Activity that shows a listview. On item click a second activity is started which runs an AsyncTask that fetches a remote URL based on which item is clicked, parses the results, then displays those results into another list view. While the async task is running I have a "loading" view that just displays an image and text. The problem is if I initiate the activity that runs the async task, then press back and start another instance of said activity, I get a force close.</p> <p>I have tried <pre>private class getlist extends AsyncTask implements OnDismissListener{ ... @Override public void onDismiss(DialogInterface arg0) { this.cancel(true); } }</pre></p> <p>But the problem persists.</p> <p>I have also put</p> <pre> if(!isCancelled()){ setContentView(R.layout.list); ... etc. } </pre> <p>into my onPostExecute call, but either this is not preventing the view from being switched, or the problem is something else.</p> <p>logcat shows "unexpected resume while already resumed .. got RemoteException sending setActive(false) notification" Then a bit further down in the log, "java.net.SocketTimeoutException: Socket is not connected"</p> <p>How can I resolve this?</p> <p>update:</p> <pre> E/AndroidRuntime(19379): Uncaught handler: thread AsyncTask #2 exiting due to uncaught exception E/AndroidRuntime(19379): java.lang.RuntimeException: An error occured while executing doInBackground() E/AndroidRuntime(19379): at android.os.AsyncTask$3.done(AsyncTask.java:200) E/AndroidRuntime(19379): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) E/AndroidRuntime(19379): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) E/AndroidRuntime(19379): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) E/AndroidRuntime(19379): at java.util.concurrent.FutureTask.run(FutureTask.java:137) E/AndroidRuntime(19379): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068) E/AndroidRuntime(19379): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561) E/AndroidRuntime(19379): at java.lang.Thread.run(Thread.java:1096) E/AndroidRuntime(19379): Caused by: java.lang.NullPointerException E/AndroidRuntime(19379): at com.metatroid.android.swim.ThreadViewer.getPosts(ThreadViewer.java:153) E/AndroidRuntime(19379): at com.metatroid.android.swim.ThreadViewer$getlist.doInBackground(ThreadViewer.java:70) E/AndroidRuntime(19379): at com.metatroid.android.swim.ThreadViewer$getlist.doInBackground(ThreadViewer.java:1) E/AndroidRuntime(19379): at android.os.AsyncTask$2.call(AsyncTask.java:185) E/AndroidRuntime(19379): at java.util.concurrent.FutureTask$Sync.innerRun</pre>
 

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