Android Open Source - android-open-street-map Tiles Downloader

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License

The source code is released under:

Apache License

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Java Source Code

package com.android.lib.map.osm;
/* w  ww .j a  v a  2 s  .c o m*/
import java.util.ArrayList;
import java.util.List;

import com.android.lib.map.osm.models.MapTile;

import android.os.Handler;


public class TilesDownloader {

  private RemoteTileLoader mRemoteTileLoader;
  
  public TilesDownloader(Handler handler) {
    mRemoteTileLoader = new RemoteTileLoader(handler, 0);
  }
  
  public static List<Tile> getTilesForBoundaryBox(int mapTypeId, int minZoom, int maxZoom, final double north, final double south, 
      final double east, final double west) {
    
    List<Tile> tiles = new ArrayList<Tile>();
    
    for(int z = minZoom; z <= maxZoom; z++){
            final Tile upperLeft = Projection.getMapTileFromCoordinates(north, west, z);
            final Tile lowerRight = Projection.getMapTileFromCoordinates(south, east, z);
            
            for(int x = upperLeft.mapX; x <= lowerRight.mapX; x++){
                for(int y = upperLeft.mapY; y <= lowerRight.mapY; y++){
                  
                  tiles.add(new Tile(x, y, z, mapTypeId));
                  
                }
            }
    }
    return tiles;
  }

  public static int getNbTilesForBoundaryBox(int minZoom, int maxZoom, final double north, final double south, 
      final double east, final double west) {
    
    int count = 0;
    
    for(int z = minZoom; z <= maxZoom; z++){
            final Tile upperLeft = Projection.getMapTileFromCoordinates(north, west, z);
            final Tile lowerRight = Projection.getMapTileFromCoordinates(south, east, z);
            
            for(int x = upperLeft.mapX; x <= lowerRight.mapX; x++){
                for(int y = upperLeft.mapY; y <= lowerRight.mapY; y++){
                  
                  count++;
                  
                }
            }
    }
    return count;
  }
  
  
  /**
   * Check if tiles are in Db, if not download them 
   * @param Tiles list
   * @return number of tiles added for download
   */
  public int download(List<Tile> tiles) {
    int tileAdded = 0;
    for (Tile tile : tiles) {
          if (!MapTile.hasTile(tile)) {
            mRemoteTileLoader.queueTileRequest(tile);
            tileAdded++;
          }
    }
    return tileAdded;
  }  
}

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