I get reports of NullPointerExceptions in onPrepareDialog in line 860
(method call to prepareCongratulationsDialog(dialog)):
@Override
protected void onPrepareDialog(int id, Dialog dialog) {
super.onPrepareDialog(id, dialog);
switch (id) {
case DIALOG_CONGRATULATIONS:
prepareCongratulationsDialog(dialog); // line 860
break;
case DIALOG_...:
// some code
}
}
private void prepareCongratulationsDialog(Dialog dialog) {
// some code
};
The dialog is a managed dialog opened using
showDialog(DIALOG_CONGRATULATIONS)
The stack trace looks like this:
java.lang.NullPointerException
at com.company.app.MyActivity.onPrepareDialog(MyActivity.java:860)
at android.app.Activity.onPrepareDialog(Activity.java:2505)
at android.app.Activity.showDialog(Activity.java:2555)
at android.app.Activity.showDialog(Activity.java:2514)
...
I normally can't reproduce the problem (only once so far) and it seems
to happen on arbitrary devices and Android versions but once it occurs
it seems to have a certain persistency (I normally get several crash
reports from the same devices).
How could that line possibly cause an NPE? Even if dialog were null
(which it isn't, I had a productive version that tested against dialog
being null and that didn't help), at least
prepareCongratulationsDialog should be called.
In that case the stack trace would show the line of code in
prepareCongratulationsDialog causing the NPE (tested that as well just
to make sure).
I tried to put a try catch around the method call. What happened is
that the app didn't crash and the dialog appeared but "unprepared"
meaning with all the %1$s etc. placeholders that the onPrepareDialog
is supposed to replace.
If the method prepareCongratulationsDialog itself isn't crashing how
could line 860 possibly cause an NPE?
Could the fact that I'm using ProGuard be related to these crashes?
Any help is very much appreciated.
Emanuel Moecklin
1gravity LLC
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