Waller

Generate beautiful gradient wallpapers (linear / radial / sweep / diamond), preview them in portrait or landscape, tweak colors, add snow / grain, stripes, and Nothing Style glass pattern for a polished aesthetic — then apply or save them right from the app.

A compact, modern Jetpack Compose app that demonstrates generating Android Bitmaps from Compose Brush concepts, saving to MediaStore, and applying wallpapers (home/lock/both) using WallpaperManager.

Highlights

- Jetpack Compose UI with responsive grid previews. - Multiple gradient styles: Linear, Radial, Angular (sweep), and Diamond. - Random color generation with pleasing light/dark bias and on-demand user color picking (HSV + hex). - Optional Snow effect, Stripes, and Nothing Style glass pattern for a polished aesthetic. - Create high-resolution bitmaps based on the device/window size to apply as wallpaper. - Save generated images to Pictures/Waller via MediaStore (handles API differences). - Apply wallpaper to Home, Lock, or Both (where supported).

Features

- Portrait / Landscape preview and bitmap generation. - Select up to 5 custom colors or let the app pick random palettes. - Choose available gradient styles (multi-select): Linear, Radial, Angular, Diamond. - Effects toggles: - Snow effect – soft film-like grain. - Stripes – vertically repeated translucent lines. - Nothing Style – adds a clean, subtle, glass-like pattern inspired by Nothing OS. - Preview grid of generated variations (20 by default). - Apply wallpaper to Home, Lock, or Both screens. - Download wallpaper to Pictures/Waller (visible in gallery). - Simple, focused UI implemented fully in Compose.