Offline Vector Tile Map for Android and iOS app

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I am trying to generate vector files and store them in a MBtiles file to make them available for download within the app.

• I have downloaded the OpenStreetMap city raw data in PDF from MapZen metro extract
• I have put the data in a PostGIS Database using osm2psql and OSM Bright
• I have used MapBox Studio's tilelive to generate the vector mbtiles (see https://github.com/mapbox/mapbox-studio/issues/1080#issuecomment-97189457)

But I'm getting a 1.3GB file for the sole greater London.

My questions:

• Vector tiles are supposed to be much smaller than raster ones, any reason why I would get such an abnormally large file. (Nutiteq or Skobbler have packages of about 30MB for greater london)
  
• If I do manage to generate them, what would be a good way to have them integrated in android and in iOS? Apparently this is not possible yet using MapBox SDK: https://github.com/mapbox/mapbox-gl-native/issues/584
  

Thanks!



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