Jake Wharton walks through how to integrate Android's Palette library with Picasso before official support was added. Since Bitmap is a final class and callbacks run on the main thread, the Transformer hook is identified as the best integration point. The post explores two approaches: a stateful transformation instance passed by reference (with object pooling for efficiency), and a WeakHashMap-based cache keyed by Bitmap. Trade-offs of each approach are discussed, including memory management, cache invalidation, and palette consistency across different image resolutions.
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