xamarin.froms与xamarin.andriod项目使用 Camera2 自定义人脸识别预览界面（圆形）

CustomRenderer.Droid.CameraCaptureCallback, CustomRenderer.Droid;crc648ca281e8f38403b9.CameraCaptureCallback CustomRenderer.Droid.CameraCaptureCallback;crc648ca281e8f38403b9.CameraCaptureCallback customrenderer.droid.CameraCaptureCallback;crc648ca281e8f38403b9.CameraCaptureCallback CustomRenderer.Droid.CircleViewRenderer, CustomRenderer.Droid;crc648ca281e8f38403b9.CircleViewRenderer CustomRenderer.Droid.CircleViewRenderer;crc648ca281e8f38403b9.CircleViewRenderer customrenderer.droid.CircleViewRenderer;crc648ca281e8f38403b9.CircleViewRenderer CustomRenderer.Droid.MainActivity, CustomRenderer.Droid;crc648ca281e8f38403b9.MainActivity CustomRenderer.Droid.MainActivity;crc648ca281e8f38403b9.MainActivity customrenderer.droid.MainActivity;crc648ca281e8f38403b9.MainActivity CustomRenderer.Droid.CameraPreviewRenderer, CustomRenderer.Droid;crc648ca281e8f38403b9.CameraPreviewRenderer CustomRenderer.Droid.CameraPreviewRenderer;crc648ca281e8f38403b9.CameraPreviewRenderer customrenderer.droid.CameraPreviewRenderer;crc648ca281e8f38403b9.CameraPreviewRenderer CustomRenderer.Droid.AutoFitTextureView, CustomRenderer.Droid;crc648ca281e8f38403b9.AutoFitTextureView CustomRenderer.Droid.AutoFitTextureView;crc648ca281e8f38403b9.AutoFitTextureView customrenderer.droid.AutoFitTextureView;crc648ca281e8f38403b9.AutoFitTextureView CustomRenderer.Droid.CameraStateListener, CustomRenderer.Droid;crc648ca281e8f38403b9.CameraStateListener CustomRenderer.Droid.CameraStateListener;crc648ca281e8f38403b9.CameraStateListener customrenderer.droid.CameraStateListener;crc648ca281e8f38403b9.CameraStateListener CustomRenderer.Droid.CameraCaptureStateListener, CustomRenderer.Droid;crc648ca281e8f38403b9.CameraCaptureStateListener CustomRenderer.Droid.CameraCaptureStateListener;crc648ca281e8f38403b9.CameraCaptureStateListener customrenderer.droid.CameraCaptureStateListener;crc648ca281e8f38403b9.CameraCaptureStateListener CustomRenderer.Droid.CameraFragment, CustomRenderer.Droid;crc648ca281e8f38403b9.CameraFragment CustomRenderer.Droid.CameraFragment;crc648ca281e8f38403b9.CameraFragment customrenderer.droid.CameraFragment;crc648ca281e8f38403b9.CameraFragment CustomRenderer.Droid.CameraOnImageAvailableListener, CustomRenderer.Droid;crc648ca281e8f38403b9.CameraOnImageAvailableListener CustomRenderer.Droid.CameraOnImageAvailableListener;crc648ca281e8f38403b9.CameraOnImageAvailableListener customrenderer.droid.CameraOnImageAvailableListener;crc648ca281e8f38403b9.CameraOnImageAvailableListener AndroidX.Activity.IOnBackPressedDispatcherOwner, Xamarin.AndroidX.Activity;androidx.activity.OnBackPressedDispatcherOwner AndroidX.Activity.IOnBackPressedDispatcherOwner;androidx.activity.OnBackPressedDispatcherOwner androidx.activity.OnBackPressedDispatcherOwner;androidx.activity.OnBackPressedDispatcherOwner AndroidX.Annotations.IAnimatorRes, Xamarin.AndroidX.Annotation;androidx.annotation.AnimatorRes AndroidX.Annotations.IAnimatorRes;androidx.annotation.AnimatorRes androidx.annotation.AnimatorRes;androidx.annotation.AnimatorRes AndroidX.Annotations.IAnimRes, Xamarin.AndroidX.Annotation;androidx.annotation.AnimRes AndroidX.Annotations.IAnimRes;androidx.annotation.AnimRes androidx.annotation.AnimRes;androidx.annotation.AnimRes AndroidX.Annotations.IAnyRes, Xamarin.AndroidX.Annotation;androidx.annotation.AnyRes AndroidX.Annotations.IAnyRes;androidx.annotation.AnyRes androidx.annotation.AnyRes;androidx.annotation.AnyRes AndroidX.Annotations.IAnyThread, Xamarin.AndroidX.Annotation;androidx.annotation.AnyThread AndroidX.Annotations.IAnyThread;androidx.annotation.AnyThread androidx.annotation.AnyThread;androidx.annotation.AnyThread AndroidX.Annotations.IArrayRes, Xamarin.AndroidX.Annotation;androidx.annotation.ArrayRes AndroidX.Annotations.IArrayRes;androidx.annotation.ArrayRes androidx.annotation.ArrayRes;androidx.annotation.ArrayRes AndroidX.Annotations.IAttrRes, Xamarin.AndroidX.Annotation;androidx.annotation.AttrRes AndroidX.Annotations.IAttrRes;androidx.annotation.AttrRes androidx.annotation.AttrRes;androidx.annotation.AttrRes AndroidX.Annotations.IBinderThread, Xamarin.AndroidX.Annotation;androidx.annotation.BinderThread AndroidX.Annotations.IBinderThread;androidx.annotation.BinderThread androidx.annotation.BinderThread;androidx.annotation.BinderThread AndroidX.Annotations.IBoolRes, Xamarin.AndroidX.Annotation;androidx.annotation.BoolRes AndroidX.Annotations.IBoolRes;androidx.annotation.BoolRes androidx.annotation.BoolRes;androidx.annotation.BoolRes AndroidX.Annotations.ICallSuper, Xamarin.AndroidX.Annotation;androidx.annotation.CallSuper AndroidX.Annotations.ICallSuper;androidx.annotation.CallSuper androidx.annotation.CallSuper;androidx.annotation.CallSuper AndroidX.Annotations.ICheckResult, Xamarin.AndroidX.Annotation;androidx.annotation.CheckResult AndroidX.Annotations.ICheckResult;androidx.annotation.CheckResult androidx.annotation.CheckResult;androidx.annotation.CheckResult AndroidX.Annotations.IColorInt, Xamarin.AndroidX.Annotation;androidx.annotation.ColorInt AndroidX.Annotations.IColorInt;androidx.annotation.ColorInt androidx.annotation.ColorInt;androidx.annotation.ColorInt AndroidX.Annotations.IColorLong, Xamarin.AndroidX.Annotation;androidx.annotation.ColorLong AndroidX.Annotations.IColorLong;androidx.annotation.ColorLong androidx.annotation.ColorLong;androidx.annotation.ColorLong AndroidX.Annotations.IColorRes, Xamarin.AndroidX.Annotation;androidx.annotation.ColorRes AndroidX.Annotations.IColorRes;androidx.annotation.ColorRes androidx.annotation.ColorRes;androidx.annotation.ColorRes AndroidX.Annotations.IContentView, Xamarin.AndroidX.Annotation;androidx.annotation.ContentView AndroidX.Annotations.IContentView;androidx.annotation.ContentView androidx.annotation.ContentView;androidx.annotation.ContentView AndroidX.Annotations.IDimenRes, Xamarin.AndroidX.Annotation;androidx.annotation.DimenRes AndroidX.Annotations.IDimenRes;androidx.annotation.DimenRes androidx.annotation.DimenRes;androidx.annotation.DimenRes AndroidX.Annotations.IDimension, Xamarin.AndroidX.Annotation;androidx.annotation.Dimension AndroidX.Annotations.IDimension;androidx.annotation.Dimension androidx.annotation.Dimension;androidx.annotation.Dimension AndroidX.Annotations.IDrawableRes, Xamarin.AndroidX.Annotation;androidx.annotation.DrawableRes AndroidX.Annotations.IDrawableRes;androidx.annotation.DrawableRes androidx.annotation.DrawableRes;androidx.annotation.DrawableRes AndroidX.Annotations.IFloatRange, Xamarin.AndroidX.Annotation;androidx.annotation.FloatRange AndroidX.Annotations.IFloatRange;androidx.annotation.FloatRange androidx.annotation.FloatRange;androidx.annotation.FloatRange AndroidX.Annotations.IFontRes, Xamarin.AndroidX.Annotation;androidx.annotation.FontRes AndroidX.Annotations.IFontRes;androidx.annotation.FontRes androidx.annotation.FontRes;androidx.annotation.FontRes AndroidX.Annotations.IFractionRes, Xamarin.AndroidX.Annotation;androidx.annotation.FractionRes AndroidX.Annotations.IFractionRes;androidx.annotation.FractionRes androidx.annotation.FractionRes;androidx.annotation.FractionRes AndroidX.Annotations.IGuardedBy, Xamarin.AndroidX.Annotation;androidx.annotation.GuardedBy AndroidX.Annotations.IGuardedBy;androidx.annotation.GuardedBy androidx.annotation.GuardedBy;androidx.annotation.GuardedBy AndroidX.Annotations.IHalfFloat, Xamarin.AndroidX.Annotation;androidx.annotation.HalfFloat AndroidX.Annotations.IHalfFloat;androidx.annotation.HalfFloat androidx.annotation.HalfFloat;androidx.annotation.HalfFloat AndroidX.Annotations.IIdRes, Xamarin.AndroidX.Annotation;androidx.annotation.IdRes AndroidX.Annotations.IIdRes;androidx.annotation.IdRes androidx.annotation.IdRes;androidx.annotation.IdRes AndroidX.Annotations.IInspectablePropertyEnumEntry, Xamarin.AndroidX.Annotation;androidx.annotation.InspectableProperty$EnumEntry AndroidX.Annotations.IInspectablePropertyEnumEntry;androidx.annotation.InspectableProperty$EnumEntry an