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Fix app:aspectRatio not working at Camera2 #177
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When device has Camera2 API (whether Camera2 class expected to successfully initialized or not),
app:aspectRatiovalue is passed followingCameraView(Context, AttributeSet, int),CameraView#setAspectRatio(AspectRatio)andCamera2#setAspectRatio(AspectRatio).In
Camera2#setAspectRatio(AspectRatio), checking ratio is exists inmPreviewSizesbut it is initializing whenCamera2#start().Therefore
mPreviewSizeshas no value, so reachingreturn falseand aspect ratio keeps 4:3 (default value).