Latest Contributions by ThomasDumont-Goyette

I’m trying to have a map with dted and mbtiles file. Here’s the sample “raster-layer-file” modified to have a mbTile file with the dted.  If you run this example everything is fine except the dted is on top of the mbTile and I would like the opposite in order to put some transparency on the mbTile and see the relief of the dted under it. If you switch line 79 and 80 to have rasterLayer added to the map first, it doesn’t work anymore. Only the dted is shown and you can’t zoom out very far and the north and south are locked on the dted. public class MainActivity extends AppCompatActivity {   private MapView mMapView;   @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     // retrieve the MapView from layout     mMapView = (MapView) findViewById(R.id.mapView);     // define permission to request     String[] reqPermission = new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE };     int requestCode = 2;     // For API level 23+ request permission at runtime     if (ContextCompat.checkSelfPermission(MainActivity.this,         reqPermission[0]) == PackageManager.PERMISSION_GRANTED) {       final RasterLayer rasterLayer = loadRaster();       final Layer mbtileLayer = loadMbTile();       // create a Map with imagery basemap       ArcGISMap map = new ArcGISMap(new Basemap());       // add the map to a map view       mMapView.setMap(map);       // add layers to map 79    map.getOperationalLayers().add(mbtileLayer); 80    map.getOperationalLayers().add(rasterLayer);     } else {       // request permission       ActivityCompat.requestPermissions(MainActivity.this, reqPermission, requestCode);     }   }   /**    * Using values stored in strings.xml, builds path to Shasta.tif.    *    * @return the path to raster file    */   private String buildRasterPath() {     // get sdcard resource name     File extStorDir = Environment.getExternalStorageDirectory();     // get the directory     String extSDCardDirName =         this.getResources().getString(R.string.raster_folder) + "/dted/W074";     // get raster filename     String filename = "N45";     // create the full path to the raster file     return extStorDir.getAbsolutePath()         + File.separator         + extSDCardDirName         + File.separator         + filename         + ".DT2";   }   /**    * Loads Shasta.tif as a Raster and adds it to a new RasterLayer. The RasterLayer is then added    * to the map as an operational layer. Map viewpoint is then set based on the Raster's geometry.    */   private RasterLayer loadRaster() {     // create a raster from a local raster file     Raster raster = new Raster(buildRasterPath());     // create a raster layer     final RasterLayer rasterLayer = new RasterLayer(raster);     // add renderer     rasterLayer.setRasterRenderer(new HillshadeRenderer(35, 143, 8));     rasterLayer.addDoneLoadingListener(new Runnable() {       @Override       public void run() {         mMapView.setViewpointGeometryAsync(rasterLayer.getFullExtent(), 50);       }     });     return rasterLayer;   }   private Layer loadMbTile()   {     return buildMbTileLayer();   }   private Layer buildMbTileLayer()   {     // get sdcard resource name     File extStorDir = Environment.getExternalStorageDirectory();     // get the directory     String extSDCardDirName =         this.getResources().getString(R.string.raster_folder) + "/mbtiles";     // get mbTile filename     String filename = "Rheinmetall";     // create the full path to the mbTile file     String path = extStorDir.getAbsolutePath()                             + File.separator                             + extSDCardDirName                             + File.separator                             + filename                             + ".mbtiles";     final SQLiteDatabase database = SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.OPEN_READONLY, null);     final Envelope envWGS = new Envelope(-180.0, -85.05112877980659, 180.0, 85.05112877980659, SpatialReferences.getWgs84());     Envelope envWeb = (Envelope) GeometryEngine.project(envWGS, SpatialReferences.getWebMercator());     final Point origin = new Point(envWeb.getXMin(), envWeb.getYMax(), envWeb.getSpatialReference());     final List<LevelOfDetail> levelOfDetail = new ArrayList<>();     for(int i = 0; i < 100; i++)       levelOfDetail.add(new LevelOfDetail(i, 156543.032 / Math.pow(2, i), 554678932 / Math.pow(2, i)));     final TileInfo tileInfo = new TileInfo(96, TileInfo.ImageFormat.JPG, levelOfDetail, origin, envWeb.getSpatialReference(), 256, 256);     return new ImageTiledLayer(tileInfo, envWeb)     {       @Override       protected byte[] getTile(final TileKey tileKey)       {         final int nRows = (1 << tileKey.getLevel());         final int tmsRow = nRows - 1 - tileKey.getRow();         final Cursor imageCur = database.rawQuery(             "SELECT tile_data FROM tiles WHERE zoom_level = " + Integer.toString(tileKey.getLevel()) +                 " AND tile_column = " + Integer.toString(tileKey.getColumn()) +                 " AND tile_row = " + Integer.toString(tmsRow), null);         if(imageCur.moveToFirst())         {           final byte[] blob = imageCur.getBlob(0);           imageCur.close();           return blob;         }         imageCur.close();         return null;       }     };   } ... 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