Imava

A privacy-focused Android gallery app built with Jetpack Compose, Hilt, Room, Coil, and Media3.

Features

Timeline & Performance Paging 3 grid with incremental pagination (page size 60) Pinch-to-zoom between 1–6 columns with settings slider Fast scrubber with equidistant date sampling ContentObserver on Images, Video, and Files URIs Batched Room queries (500 items/chunk) Downsampled 280x280 thumbnails via Coil

"On This Day" Memories Surfaces photos from the same date in previous years Fullscreen story viewer with segmented progress bar, auto-advance, tap navigation, hold-to-pause 24-hour dismissal persistence, scoped to Albums view

Photo Collage Maker Grid templates for 2–9 photos 1:1, 4:5, 9:16, 16:9 aspect ratios Adjustable spacing and corner radius 2048px JPEG export to Pictures/Collages

Privacy Redaction & Markup Destructive pixelation brush for redacting sensitive content Freehand pen, arrows, rectangles, ellipses Color palette with undo/redo

Video Frame Capture Extract still frames from video playback via MediaMetadataRetriever Saved to Pictures/Video_Captures

Vault Backup & Restore Export vault as encrypted .imava container (AES-256-GCM, PBKDF2 250k iterations) Restore via SAF for device migration

Storage Doctor Flags large videos (>50 MB), old screenshots (>30 days), burst groups "Keep Best" quick cleanup

Slideshow Player Ken Burns pan-and-zoom with crossfade transitions 3s / 5s / 8s pacing, shuffle, tap-to-pause

Photo Comparison Side-by-side split viewer (vertical or horizontal) Synchronized or independent zoom/pan Photo Viewer Swipe-down-to-dismiss with scaling and alpha fade Sub-sampling tile decoder for large images Custom tags (#Receipt, #Travel) stored in Room, searchable Print via AndroidX PrintHelper Set as wallpaper, set as album cover EXIF metadata viewer with "Open in Maps"

Albums List, 2/3/4 column grid layouts Sort by name, count, or recent activity Pin and exclude folders Storage usage overview

Batch Rename Numbered sequence (Trip_001.jpg, Trip_002.jpg) Date-stamped prefix Find & replace

Photo Editor Brightness, contrast, saturation, warmth sliders Filter presets (B&W, Warm, Cool, Sepia, Vivid) Freeform crop with aspect presets, 90° rotation, flip Target-size compressor

Video Player 0.25x–3.0x playback speed, long-press 2x hold Swipe brightness/volume gestures Audio/subtitle track selector Audio extractor (.m4a via MediaExtractor + MediaMuxer) Lossless video trimmer GIF generator

Encrypted Vault AES-256-GCM via AndroidKeyStore (12-byte IV, 128-bit tag) Transient decryption cache, wiped on lock Lossless restore with MediaScanner re-indexing PBKDF2 PIN hashing (100k iterations) Decoy PIN for plausible deniability Rate-limited lockout FLAG_SECURE on vault media PIN, pattern lock, or biometric auth Stealth mode via search trigger

Duplicate Finder Groups by file size, dimensions, duration Burst clustering Perceptual hashing (dHash + aHash) on 32x32 micro-thumbnails Progress reporting

Trash 30-day auto-purge via WorkManager One-tap empty

Privacy & Export EXIF metadata stripper for sharing Multi-photo PDF export (A4, auto-orientation)