Consider openmaptiles for storing offline maps, rendering

[thousandsofthem]

https://openmaptiles.org/

OpenMapTiles Vector Tile Schema:
https://openmaptiles.org/schema/
https://github.com/openmaptiles/openmaptiles

It makes sense to use something designed for speed - data is split in chunks in a way only relevant bits can be fetched (basically mimicking raster tiles)

• waaay faster
• even in a browser: https://openmaptiles.github.io/
• pre-built infrastructure, including tooling, docs, styles etc
• is an open standard
• have pre-built renderer (no idea about java/android one though)

Downsides:

• Map size. Not the most compact format probably
• Routing. Don't think openmaptiles can help here, at all. separate graph for roads should work though

[thousandsofthem]

openmaptiles does have android app:

https://play.google.com/store/apps/details?id=com.klokantech.osm2vectortiles

[juliusvonkohout]

The Android applications is amazing and even online rendering is so much faster than current osmand. It is almost at Google maps level.