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POincomplete asynctask crashes my app
 

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  1. POincomplete asynctask crashes my app
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    <p>I am using <code>AsyncTask</code> in some of my <code>Fragment</code> and <code>Activity</code> and these work nice. But the problem is when I press back button or exit app at the time of <code>Asynchronous</code> task execution, The app crashes. This is my log cat:</p> <pre><code>08-16 08:15:34.032: E/AndroidRuntime(21957): FATAL EXCEPTION: main 08-16 08:15:34.032: E/AndroidRuntime(21957): java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState 08-16 08:15:34.032: E/AndroidRuntime(21957): at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1327) 08-16 08:15:34.032: E/AndroidRuntime(21957): at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1338) 08-16 08:15:34.032: E/AndroidRuntime(21957): at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:595) 08-16 08:15:34.032: E/AndroidRuntime(21957): at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:574) 08-16 08:15:34.032: E/AndroidRuntime(21957): at me.kaidul.uhunt.MainActivity.selectItem(MainActivity.java:434) 08-16 08:15:34.032: E/AndroidRuntime(21957): at me.kaidul.uhunt.MainActivity.access$0(MainActivity.java:387) 08-16 08:15:34.032: E/AndroidRuntime(21957): at me.kaidul.uhunt.MainActivity$GetProblemListTask.onPostExecute(MainActivity.java:680) 08-16 08:15:34.032: E/AndroidRuntime(21957): at me.kaidul.uhunt.MainActivity$GetProblemListTask.onPostExecute(MainActivity.java:1) 08-16 08:15:34.032: E/AndroidRuntime(21957): at android.os.AsyncTask.finish(AsyncTask.java:417) 08-16 08:15:34.032: E/AndroidRuntime(21957): at android.os.AsyncTask.access$300(AsyncTask.java:127) 08-16 08:15:34.032: E/AndroidRuntime(21957): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429) 08-16 08:15:34.032: E/AndroidRuntime(21957): at android.os.Handler.dispatchMessage(Handler.java:99) 08-16 08:15:34.032: E/AndroidRuntime(21957): at android.os.Looper.loop(Looper.java:123) 08-16 08:15:34.032: E/AndroidRuntime(21957): at android.app.ActivityThread.main(ActivityThread.java:4627) 08-16 08:15:34.032: E/AndroidRuntime(21957): at java.lang.reflect.Method.invokeNative(Native Method) 08-16 08:15:34.032: E/AndroidRuntime(21957): at java.lang.reflect.Method.invoke(Method.java:521) 08-16 08:15:34.032: E/AndroidRuntime(21957): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 08-16 08:15:34.032: E/AndroidRuntime(21957): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 08-16 08:15:34.032: E/AndroidRuntime(21957): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>I am not adding here the <code>AsyncTask</code> code as they are working properly without pressing back button or exiting the app. I call all the <code>AsyncTask</code> like new <code>GetTaskDone().execute(parameter)</code> and there are <code>onPostExecute</code> in every <code>AsycTask</code>.</p> <p>How can I avoid app crashing ?</p> <p><strong>Edit:</strong></p> <p>Now I am thinking that, the problem might not in <code>AsyncTask</code>. Because my other <code>AsyncTask</code> is working regardless of backpress/exit.</p> <p>This is the problematic AsyncTask:</p> <p>protected class GetProblemListTask extends AsyncTask {</p> <pre><code>@Override protected Void doInBackground(String... params) { InputStreamReader isr = null; if (hasConnection) { Date date = new Date(); long savedTime = prefs.getLong(CommonUtils.LAST_SAVED, date.getTime()); long now = date.getTime(); if (now - savedTime &gt; fiveDays || (now - savedTime &lt;= fiveDays &amp;&amp; prefs.getBoolean( CommonUtils.problemListisCached, false) == false)) { if (CommonUtils.isDebuggable) { Log.d("updating", "need to update!"); } prefs.edit() .putBoolean(CommonUtils.problemListisCached, false) .commit(); isr = new JSONDownloader().getJSONStringFromUrl(params[0]); BufferedReader br = new BufferedReader(isr, bufferSize); StringBuilder sb = new StringBuilder(); String line = null; try { while ((line = br.readLine()) != null) { sb.append(line + "\n"); } } catch (IOException e) { Log.d("problem", "in file writting"); } writeToFile(sb.toString(), CommonUtils.FILE_PROBLEM_LIST); prefs.edit() .putBoolean(CommonUtils.problemListisCached, true) .commit(); try { isr.close(); } catch (IOException e) { if (CommonUtils.isDebuggable) { Log.d("isr", e.toString()); } } try { br.close(); } catch (IOException e) { if (CommonUtils.isDebuggable) { Log.d("br", e.toString()); } } prefs.edit().putLong(CommonUtils.LAST_SAVED, now).commit(); } else { if (CommonUtils.isDebuggable) { Log.d("old_copy", "Old copy is rendering"); } try { isr = new InputStreamReader( openFileInput(CommonUtils.FILE_PROBLEM_LIST)); } catch (FileNotFoundException e) { Log.d("file_not_found", "File is missing!"); } } } else { try { isr = new InputStreamReader( openFileInput(CommonUtils.FILE_PROBLEM_LIST)); } catch (FileNotFoundException e) { Log.d("file_not_found", "File is missing!"); } } if (CommonUtils.isDebuggable) { Log.d("start", "mapping start"); } try { isr = new InputStreamReader( openFileInput(CommonUtils.FILE_PROBLEM_LIST)); } catch (FileNotFoundException e1) { } JsonReader reader = new JsonReader(isr); try { reader.beginArray(); while (reader.hasNext()) { reader.beginArray(); problems.put( reader.nextInt(), new Problems(reader.nextString(), reader .nextString(), reader.nextInt())); while (reader.hasNext()) reader.skipValue(); reader.endArray(); } reader.endArray(); reader.close(); } catch (IOException e) { if (CommonUtils.isDebuggable) { Log.d("problems", "hashmaping problem"); } } return null; } @Override protected void onPostExecute(Void result) { getSupportActionBar().setHomeButtonEnabled(true); getSupportActionBar().setDisplayHomeAsUpEnabled(true); // this is selecItem() function. It's task is to add a fragment to the activity. selectItem(0); if (CommonUtils.isDebuggable) { Log.d("successful", "eventually survived!"); } } </code></pre> <p>}</p>
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    1. PO
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    1. PTQuestion
    1. USKaidul Islam
    1. USKaidul Islam
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. PO
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    1. COWe need to see the `AsyncTask` code to help you. It has something to do method `selectItem` in `MainActivity`. that's all I can tell you so far.
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      1. POincomplete asynctask crashes my app
      1. USWilliam Morrison
    2. CONice catch Sir. I might get the clue. I have edited my question and add the `AsyncTask` code.Take a look!
      singulars
      1. POincomplete asynctask crashes my app
      1. USKaidul Islam
    3. COIs selectItem posting the UI thread? If so its unnecessary. `onPostExecute` is run on the UI thread. The stack trace says line 434 in MainActivity is the source of the issue. Look at that line, its what causes the crash.
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      1. POincomplete asynctask crashes my app
      1. USWilliam Morrison
 

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