>
> I cannot divulge the source code as it is for work - however I've done
>>> some renaming and stripped it down. However, after stripping it down to
>>> just the parts which I suspect cause the bug, and enabling the line that
>>> causes the bug, the bug doesn't happen anymore!
>>
>>
>>> So this source code is just to give a clue to anyone else who
>>> experiences this, as to where to look. This code doesn't actually trigger
>>> the bug.
>>
>>
>>> onCreate calls showSingleUse, which spawns a SingleUseFragment, which
>>> calls onSingleUse in the activity (because it implements an interface
>>> called OnFragmentUtilityListener). onSingleUse then calls an AsyncTask
>>> which does a findViewById in its onPreExecute.
>>
>>
>>> Disabling the findViewById, and moving it to onCreate, solves the
>>> problem.
>>
>>
>>> *SwiperActivity.java:*
>>
>>
>>> import android.os.AsyncTask;
>>
>> import android.os.Build;
>>
>> import android.os.Bundle;
>>
>> import android.support.v4.app.FragmentActivity;
>>
>> import android.widget.TextView;
>>
>>
>>> import com.actionbarsherlock.app.SherlockFragmentActivity;
>>
>>
>>> public class SwiperActivity extends SherlockFragmentActivity implements
>>> OnFragmentUtilityListener {
>>
>> * TextView textviewLastUpdated; // this is how the NPE was fixed*
>>
>> ReloadTask reloadTask;
>>
>> @Override
>>
>> protected void onCreate(Bundle savedInstanceState) {
>>
>> super.onCreate(savedInstanceState);
>>
>> setContentView(R.layout.main);
>>
>> * textviewLastUpdated = (TextView)
>>> findViewById(R.id.textviewLastUpdated); // this is how the NPE was fixed
>>> *
>>
>> showSingleUse(this);
>>
>> }
>>
>> public static void showSingleUse(FragmentActivity activity) {
>>
>> try {
>>
>> if
>>> (activity.getSupportFragmentManager().findFragmentByTag("singleusefragment")
>>>
>>> == null) {
>>
>> activity.getSupportFragmentManager().beginTransaction().add(new
>>> SingleUseFragment(), "singleusefragment").commit();
>>
>> }
>>
>> } catch (IllegalStateException e) {}
>>
>> }
>>
>> @Override
>>
>> public void onSingleUse() {
>>
>> startReloadTask();
>>
>> }
>>
>> private class ReloadTask extends AsyncTask<Void, Void, Void> {
>>
>> @Override
>>
>> protected void onPreExecute() {
>>
>> showLoading();
>>
>> }
>>
>> @Override
>>
>> protected Void doInBackground(Void... arg0) {
>>
>> return null;
>>
>> }
>>
>> @Override
>>
>> protected void onPostExecute(Void result) {
>>
>> hideLoading();
>>
>> }
>>
>> }
>>
>> public static boolean allowsExecutorChange() {
>>
>> return Build.VERSION.SDK_INT > 10;
>>
>> }
>>
>> void startReloadTask() {
>>
>> reloadTask = new ReloadTask();
>>
>> if (allowsExecutorChange()) {
>>
>> reloadTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
>>
>> } else {
>>
>> reloadTask.execute();
>>
>> }
>>
>> }
>>
>> void showLoading() {
>>
>> // this was causing the NPE!
>>
>> *//TextView textviewLastUpdated = (TextView)
>>> findViewById(R.id.textviewLastUpdated);*
>>
>> if (textviewLastUpdated!=null) textviewLastUpdated.setText("Loading...");
>>
>> }
>>
>> void hideLoading() {
>>
>> // this was causing the NPE!
>>
>> *//TextView textviewLastUpdated = (TextView)
>>> findViewById(R.id.textviewLastUpdated);*
>>
>> if (textviewLastUpdated!=null) textviewLastUpdated.setText("Loaded!");
>>
>> }
>>
>> @Override
>>
>> public void onDismissedDialog(String tag, Object data) {}
>>
>> @Override
>>
>> public void onClickedPositiveDialog(String tag, Object data) {}
>>
>> }
>>
>>
>>> *
>>> *
>>
>> *OnFragmentUtilityListener.java:*
>>
>>
>>> public interface OnFragmentUtilityListener {
>>
>> public void onDismissedDialog(String tag, Object data);
>>
>> public void onClickedPositiveDialog(String tag, Object data);
>>
>> public void onSingleUse();
>>
>> }
>>
>>
>>> *
>>> *
>>
>> *SingleUseFragment.java:*
>>
>>
>>> /** hack-ish way to detect rotation and not do it again */
>>
>> public class SingleUseFragment extends Fragment {
>>
>> boolean wasRotating = false;
>>
>> @Override
>>
>> public void onActivityCreated(Bundle state) {
>>
>> super.onActivityCreated(state);
>>
>> setRetainInstance(true);
>>
>> }
>>
>> static SingleUseFragment newInstance() {
>>
>> return new SingleUseFragment();
>>
>> }
>>
>> @Override
>>
>> public void onAttach(Activity activity) {
>>
>> super.onAttach(activity);
>>
>> if (!wasRotating) ((OnFragmentUtilityListener) activity).onSingleUse();
>>
>> }
>>
>> @Override
>>
>> public void onSaveInstanceState(Bundle outState) {
>>
>> super.onSaveInstanceState(outState);
>>
>> wasRotating = true;
>>
>> }
>>
>> }
>>
>>
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