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Low-end devices optimization

Thanh Phong Nguyễn

Minimize image resolution

Request different images based on screen resolution, screen density and device memory

Update trade-off logic between quality & performance regularly per individual session

Consider using WebP format (

https://developers.google.com/speed/webp

)

Compressed image size decreased by at least 30% with no visible quality difference

Bitmap Heap Caching

In-memory Level 1 Bitmap cache for smooth scrolling and effeciency. Because decoding an image from disk is CPU intensive

Large Bitmap cache when dealing lot of images

50% of Runtime.maxMemory() & android:largeHeap=true

Empty cache when application in background

Use RGB 565 on small thumbs

Faster decoding

Only 2 bytes of heap per pixel, instead of 4

Sharing large buffer between C++ & Java

Limit bitrate depend on processor, resolution & memory capabilities

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