Request the camera preview on the main ui thread #324
Merged
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Request the camera preview on the main ui thread, in case the camera instance is being closed at the same time.
Since CameraInstance.close and DecoderThread.requestNextPreview are run in different threads we might, randomly, get to a point where open is still set to true in the isOpen call, while it's false when it reaches the validateOpen call.
This PR fixes this by running the requestPreview code on the main ui thread, making it run in the same thread as the close call will be in.
See #272 for more info.