Android Graphics: Blurring the Lines
summary
Android now exposes a render effect API to apply system blurs and color ops to whole views, plus an AGSL runtime shader that runs per pixel; a demo combines a system blur, a custom box-blur sampling shader and a translucent gradient “frost” to make caption text readable over images. Important gotchas: passing a blur radius of zero crashes; blurring a transparent TextView doesn’t capture background pixels. The final solution uses two render nodes and an optional compositing layer and it works.
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chapters (7)
- 0:00Introduction and talk overview
- 2:52How drawing works on Android
- 8:25Introduction to pixel shaders
- 16:48Blurs and frosted glass effects in UIs
- 22:25Combining blurs and shaders for UI effects
- 24:53Future of Android graphics APIs
- 25:35Q&A and closing remarks
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