mozilla/MozStumbler — pull request #936 by garvankeeley (2014-10-06 20:27:40+00:00)
Title: With no wifi, switch to low-resolution tiles.

- Swap in an empty base tile layer when no wi-fi (and show a Toast), and show a low-resolution coverage map instead.
- Instead of getting many levels of tiles for each zoom (typically I see 10 levels on disk), just get 2 levels.
- Reduced the lowest zoom level of the map (to 30 km x 30 km approx on Nexus 5 screen) to prevent pulling in unnecessary data for areas the user isn't stumbling.

ASIDE: Increased the max zoom to level 20, which is handy for separating the stumbling dots when walking.

TODO
- track the delta for the tile dir when not on wi-fi
- add a switch on the developer screen for tile source: default/lowres-only/high-res only