Offline map overlay over Mapnik #1709
Description
Please note: issues related to or caused by osmbonuspack will be closed with a
suggestion to open an issue at https://github.com/MKergall/osmbonuspack
(feel free to delete whatever doesn't apply)
Issue Type
[ x] Question
The goal is to overlay tiles from offline maps to online, say Mapnik. We start with a TIFF scan of a map in paper format. The .sqlite archive is by Mobac where the .gpkg is Qgis made.
See below a bunch of wild code, just for testing purpose. I run the code, via Android Studio, onboard a quite old LG G2 Mini with LineageOS, Android version 7.1.2; actually I tried with most recent ones but I have a lot of issues, as an example onboard Android 11 the Geopackage stuff fires up an obscure database error and refuse to import the map, see issue #1706.
Do case …
Case 0 works.
Case 1 works. I have white tiles around my map but not an issue at now.
Case 2 works, again with white tiles around.
Case 3 mostly works. I see Mapnik’s tiles around my map but … those Mapnik tiles are just the previously cached ones, if I pan the map to a new square looks like online tiles are not downloaded, as if someone forced setUseDataConnection(false), ouch.
Case 4 doesn’t work. I do have nice Mapnik tiles and no trace of the Geopackage’s ones.
:)
Disclaimer. I’m quite a beginner. First at all I’d need to know if I’m on the right track or I badly misunderstood how to deal with the above goal.
And if I’m not dead wrong, what’s about my code? Please help :)
TyL. Paolo.
@Override
public void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Context ctx = getApplicationContext();
Configuration.getInstance().load(ctx, PreferenceManager.getDefaultSharedPreferences(ctx));
setContentView(R.layout.activity_main);
mMapView = (MapView) findViewById(R.id.map);
mMapView.setBuiltInZoomControls(true);
mMapView.setMultiTouchControls(true);
File fileSqlite = new File(getExternalFilesDir(null), "osmdroid/cesaneMTB.sqlite");
OfflineTileProvider cesaneProvider = new OfflineTileProvider(new SimpleRegisterReceiver(this), new File[]{fileSqlite});
ITileSource cesaneSource = FileBasedTileSource.getSource("cesaneMTB");
TilesOverlay cesaneOverlay = new TilesOverlay(cesaneProvider, ctx);
File fileGpkg = new File(getExternalFilesDir(null), "osmdroid/cesaneMTB.gpkg");
File[] mapsGpkg = {fileGpkg};
GeoPackageProvider geoPackageProvider = new GeoPackageProvider(mapsGpkg, this);
List<GeopackageRasterTileSource>gpkgTileSources = geoPackageProvider.geoPackageMapTileModuleProvider().getTileSources();
GeopackageRasterTileSource gpkgSrc = (GeopackageRasterTileSource) gpkgTileSources.get(0);
TilesOverlay gpkgOverlay = new TilesOverlay(geoPackageProvider, ctx);
if (!gpkgTileSources.isEmpty()) {
log_d( "########################### DEBUG, just in case ... #############################" );
log_d( "########################### DEBUG gpkg source set to " + gpkgSrc.name() );
}
int selectedSource = 0;
switch(selectedSource) {
case 0:
// Mapnik
mMapView.setTileSource(TileSourceFactory.MAPNIK);
break;
case 1:
// cesaneMTB.sqlite
mMapView.setTileProvider(cesaneProvider);
mMapView.setTileSource(cesaneSource);
break;
case 2:
// cesaneMTB.gpkg
mMapView.setTileProvider(geoPackageProvider);
mMapView.setTileSource(gpkgSrc);
break;
case 3:
// Mapnik overlay cesaneMTB.sqlite
mMapView.setTileSource(TileSourceFactory.MAPNIK);
mMapView.getOverlays().add(cesaneOverlay);
break;
case 4:
// Mapnik overlay cesaneMTB.gpkg
mMapView.setTileSource(TileSourceFactory.MAPNIK);
mMapView.getOverlays().add(gpkgOverlay);
break;
}
IMapController mapController = mMapView.getController();
mapController.setZoom(MAP_ZOOM);
mapController.setCenter(centerPoint);
mMapView.invalidate();
} // onCreate