On Aug 7, 2012, at 12:13 AM, simpleweb <[email protected]> wrote:
> Thanks for the info guys. I found that the problem is an image button. When
> screen rotates, I get a null exception.
Stack trace?
> When I remove the image button I don't. I have a FindViewByID call in
> OnCreate(Bundle bundle)
>
> see below:
>
> // this return null exception when screen orientation changes.
> var hm= FindViewById<ImageButton>(Resource.Id.ibHomeFromLink);
So `hm` is null, and then you later try to use `hm` which results in the
NullReferencException, right?
I suspect that you have multiple layouts:
http://developer.android.com/guide/practices/screens_support.html#qualifiers
For example, you may have Resources\Layout\Main.axml and
Resources\Layout-land\Main.axml files. When you rotate to landscape
orientation, then Resources\Layout-land\Main.axml file will be used, not
Resources\Layout\Main.axml. This thus requires that your layout files be
semantically equivalent: if you have a button with a given ID in
Resources\Layout\Main.axml, then Resources\Layout-land\Main.axml must also have
a button with the same ID. Failure to keep your layouts consistent with each
other will result in FindViewById() returning null for some files.
The fix is to ensure that your layouts are consistent: if you have buttons &
fields in one layout, then the all all configurations should have the same
buttons & fields (or you need to handle the "missing" IDs in your code).
- Jon
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