nanohttpd serve mbtiles locally

[hallahan]

Since neither MapboxGL, TangramES, nor Maply Android have MBTiles support at the current moment, we can instead locally serve tiles from MBTiles via http. This would be a stopgap measure, but it should get us our map tiles without any noticeable difference.

nanohttpd is a popular nodejs-like Java http server, and it is commonly used to serve files on Android devices.

I tried the most basic hello world of just serving an index.html file in the project, and it works great:

https://github.com/AmericanRedCross/OpenMapKitAndroid/commit/e2870adbd94be45da9d5659d48e66dca9c738e9e

After a little bit of googling, I see that someone has done the same thing as an Apache Cordova plugin.

https://github.com/rgamez/cordova-plugin-http-mbtiles

It looks like it would be pretty simple to use what this cordova plugin is doing and modify it to work in a regular Android project

https://github.com/rgamez/cordova-plugin-http-mbtiles/blob/master/src/android/HTTPMBTilesServer.java

[hallahan]

This is a screenshot of a Leaflet map viewer on my laptop fetching tiles from the nano http MBTiles server on my Android phone through my local network:

This idea is proving fruitful.

[hallahan]

I'm content with the solution to this problem. I'm going to close, but if we need to add functionality as we implement our new map renderer, we can re-open.