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onTrimMemory now coordinates BitmapCache, Coil product thumbs, and the preview working set (UI_HIDDEN soft-trim / BACKGROUND evict). Export releases those reconstructable caches when getMemoryInfo says the system is low or the Java heap has less than 64 MiB remaining. Co-authored-by: rosuH <hi@rosuh.me>
Post-14 only UI_HIDDEN and BACKGROUND remain meaningful trim levels. Co-authored-by: rosuH <hi@rosuh.me>
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Reads Manage your app's memory against this photo-watermark app and applies the unused official strategies.
Already aligned (no change)
R8 minify + shrink, Coil-only UI thumbs,
inSampleSize/ RGB_565 thumbs,BitmapCachetrim, DEBUGProfilingManager, noService, nolargeHeap. The August Android 17 pass already covered most pillars.Gaps this PR closes
The article’s two unused code hooks were:
onTrimMemory— Coil product thumbs hold 30% of available memory and were not on the trim path.getMemoryInfo()before memory-intensive work —getAvailableMemory()existed with zero callers. Full-res export is that path.Also: preview trim ran on every trim level and always kept the focus Source, even when the process was a BACKGROUND kill candidate.
AndroidMemoryPressurenow coordinates three reconstructable caches:onLowMemoryExport calls
releaseReconstructableIfNeededfirst: if the system islowMemoryor remaining Java heap is under 64 MiB, those caches are dropped. The save is never skipped.Never
Bitmap.recycle()from a cache.Deliberately not applied
Hilt (ADR-0005 Koin), LeakCanary (privacy),
SparseArraysplit, activating the deadinBitmappool, closing Room on BACKGROUND, converting API 29+loadThumbnailto RGB_565.Full audit:
docs/superpowers/research/2026-08-30-manage-app-memory.mdTests
Robolectric (22/0):
AndroidMemoryPressureTest,AndroidPreviewSourceReuseTest,BitmapCacheTest,AndroidExportIntermediateReleaseTest.