I have activity class running infinite loop in BackgroundAsyncTask (see below) I have a problem trying to "finish" this activity, when i press "btnClose" the activity window disappears, but when i try to re-start this activity from "Applications" group i have "null pointer exception" java.lang.RuntimeException: An error occured while executing doInBackground() at android.os.AsyncTask$3.done(AsyncTask.java:200) at java.util.concurrent.FutureTask $Sync.innerSetException(FutureTask.java:273) at java.util.concurrent.FutureTask.setException(FutureTask.java:124) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) at java.util.concurrent.FutureTask.run(FutureTask.java:137) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java: 1068) at java.util.concurrent.ThreadPoolExecutor $Worker.run(ThreadPoolExecutor.java:561) at java.lang.Thread.run(Thread.java:1096) Caused by: java.lang.NullPointerException at mz.com.Console$BackgroundAsyncTask.doInBackground(Console.java:224) at mz.com.Console$BackgroundAsyncTask.doInBackground(Console.java:1)
Any idea where is null pointer exception coming from and how to do it right? line 224 corresponds to inner class BackgroundAsyncTask but what is causing null pointer exception? I tried to check for passed params in doInBackground: "if (params == null) return" - no difference. i stuck and would be thankful for the pointers... -V public class Console extends Activity { private BackgroundAsyncTask channel; onCreate{ ... channel = new BackgroundAsyncTask(); channel.execute(); ... public void onDestroy() { Log.i("Activity", "onDestroy"); super.onDestroy(); } buttonClose.setOnClickListener(new View.OnClickListener() { channel.cancel(true); finish(); }); line 224: public class BackgroundAsyncTask extends AsyncTask<Void, String, Void> { boolean loop; protected void onCancelled() { Log.i("Background task", "onCancelled"); loop = false; } protected Void doInBackground(Void... params) { loop = true; while(loop) { socket.receive(); publishProgress... ... } } } // end of Console -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en