Offline map using mapsforge in android

Question

How can i implement offline map in android. I tried it with mapsforge library. It does not provides binary map file for Wisconsin state. So How can create my own map binary file ?

Thanks in advance.

Meek

Answer 1

You will need two things:

1. a program that allows you to use the mapsforge library. Concerning this, you can stick with the program called AdvancedMapViewer which comes as an example with the library.

2. a mapfile. Bascially you have to create your own mapfile from OpenStreetMap data. This is done with a plugin for Osmosis. This plugin is described here:

https://github.com/mapsforge/mapsforge/blob/master/docs/Getting-Started-Map-Writer.md

In short it works like this:

• Install Osmosis (http://wiki.openstreetmap.org/wiki/Osmosis)
• Install the plugin (https://github.com/mapsforge/mapsforge/blob/master/docs/Getting-Started-Map-Writer.md)
• Download the data (e.g. from geofabrik.de: http://download.geofabrik.de/north-america/us/wisconsin-latest.osm.pbf)

• run the osmosis task, thus run this on a shell (with osmosis in your PATH):

  osmosis --read-pbf wisconsin-latest.osm.pbf --mapfile-writer file=wisconsin.map

then put the created file wisconsin.map on your device and load it from AdvancedMapViewer.

Thant

Could you please add information where to put the file on the device? I suppose there is a default location where mapsforge tries to find the files. – Cocci

just put it at the route of the sdcard and it will find it. – Depict

What if I want to include the map into an android app package? – Electrodialysis

Then you will have to include it as an asset and copy it to local storage before using it. – Thant