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[camera] Making Camera Example app's setExposureOffset more robust #7514

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Refactor Camera Example app's setExposureOffset to be possibly more robust.

Fixes flutter/flutter#154132

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It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption, contact "@test-exemption-reviewer" in the #hackers channel in Discord (don't just cc them here, they won't see it!).

If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing. The test exemption team is a small volunteer group, so all reviewers should feel empowered to ask for tests, without delegating that responsibility entirely to the test exemption group.

try {
offset = await controller!.setExposureOffset(offset);
final appliedOffset = await controller!.setExposureOffset(offset);
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This is missing a mounted check. Calling setState() after an await is potentially unsafe, as the widget might have unmounted.

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@MrCsabaToth MrCsabaToth Aug 28, 2024

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Usually local analysis points this out (async gap I think) and fails, not sure why not this time. I'll correct it!

Comment on lines +1 to +4
## 0.11.0+3

* Refactor Camera Example app's setExposureOffset to be possibly more robust.

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Unpublished example app changes don't require a version change.

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[camera] Camera Example app's setExposureOffset is not robust
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