Clip, Elevation and  ViewOutlineProvider

by Ryo Sakaguchi

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©2019 Wantedly, Inc. 1. ImageView Transformation • RoundedCorners/Circle • Approach • BitmapTransformation/Clip • Pros/Cons 2. ViewOutlineProvider • What is ViewOutlineProvider? • How to use 3. WrapUp Today’s topics What I talk today

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©2019 Wantedly, Inc. RoundedCorners/Circle Approach BitmapTransformation (Picasso/Glide) Transform the Bitmap to be displayed • Pros • Easy to use • Faster development • Cons • Hard to make transformation animation

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©2019 Wantedly, Inc. RoundedCorners/Circle Approach Clip Transform the View to be displayed • Pros • Easy to make transformation animation • Easy to share as CustomView • Preview is available with LayoutEditor • Cons • You should have some knowledge of Canvas a little. • Development is a little bit harder.

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©2019 Wantedly, Inc. View transformation Problem Elevation The elevation does not work properly • BitmapTransofrmation • Shadow will appear around view’s original shape. • Clip • Shadow will not appear…

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©2019 Wantedly, Inc. View transformation Problem Why? Both approaches do not provide the Outline to view correctly. • BitmapTransofrmation • The outline provided to its original shape(rectangle) • Clip • Outline has disappeared

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©2019 Wantedly, Inc. What is this? ViewOutlineProvider ViewOutlineProvider Interface by which a View builds its Outline, used for shadow casting and clipping*1 • Easy to clip and transform the view • Just implement one method and apply this. • Elevation works correctly! • Fully work with elevation • Limitation • API 21~ • Convex/Rect/RoundedRect/Oval *1 https://developer.android.com/reference/android/view/ViewOutlineProvider

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©2019 Wantedly, Inc. How to use? ViewOutlineProvider Implementation Just set the ViewOutlineProvider instance and set clipToOutline to true. *1 https://developer.android.com/reference/android/view/ViewOutlineProvider

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©2019 Wantedly, Inc. Clip, Elevation and ViewOutlinProvider WrapUp Using ViewOutlineProvider helps your CustomView development. • Elevation does not work correctly with just clip the view. • You should use ViewOutlineProvider and set outline to your view. • BitmapTransformation is easy but… • In some case, it does not fill your requirements.