How to open shape file (*.shp) from SD Card ?

[mrphammrpham]

Hi all !

How to open shape file (*.shp) from SD Card ?

Thank you all !

[LukeCatania]

static public GraphicsLayer SHPtoPOINT(String shpfile) {
  SpatialReference lSR = SpatialReference.create(26192);
  Envelope lEnvolope = getSHPEnvelope(shpfile);//to create an extent for your graphics layer
  GraphicsLayer graphicLayer = new GraphicsLayer(lSR, lEnvolope);

  try {
   File file = new File(shpfile);
   ShapeFile shp = new ShapeFile(file);
   ESRIPointRecord e = (ESRIPointRecord) shp.getNextRecord();
   SimpleMarkerSymbol c_point = new SimpleMarkerSymbol(Color.BLACK, 1,
     STYLE.CIRCLE);
   while (e != null) {
    graphicLayer.addGraphic(new Graphic(new Point(e.getX(), e
      .getY()), c_point));
    e = (ESRIPointRecord) shp.getNextRecord();
   }
   shp.close();
  } catch (IOException e1) {
   e1.printStackTrace();
  }
  return graphicLayer;
}

I added ability to read polygon data, but it makes the display extremely slow when zooming.  I imagine it has to do with redrawing all the polygons.  When just looking at Point shape files, it does not seem to have this issue.  Anyone have any ideas how to speed it up.  Also just loading the data makes the app take longer to start.  Here is what I added.  Still need to work on polylines.

import java.io.File;
import java.io.IOException;

import android.graphics.Color;

import com.bbn.openmap.layer.shape.ESRIPointRecord;
import com.bbn.openmap.layer.shape.ESRIPoly;
import com.bbn.openmap.layer.shape.ESRIPolygonRecord;
import com.bbn.openmap.layer.shape.ShapeFile;
import com.esri.android.map.GraphicsLayer;
import com.esri.core.geometry.Point;
import com.esri.core.geometry.Polygon;
import com.esri.core.map.Graphic;
import com.esri.core.symbol.SimpleFillSymbol;
import com.esri.core.symbol.SimpleMarkerSymbol;
import com.esri.core.symbol.SimpleMarkerSymbol.STYLE;

public class ESRIShapeLayer {

    GraphicsLayer    graphicsLayer    = new GraphicsLayer();
    String           shapeFileName    = null;
    Polygon          polygon          = new Polygon();
    Point            polygonVertex    = new Point();
    int              polygonCount     = 0;

    /**
     * Save applications's state
     */
    ApplicationState applicationState = null;

    public ESRIShapeLayer(String shapeFileName, ApplicationState applicationState) {
        this.shapeFileName = shapeFileName;
        this.applicationState = applicationState;
        readShapeFile();
    }

    public GraphicsLayer getLayer() {
        return graphicsLayer;
    }

    public GraphicsLayer readShapeFile() {
        try {
            File file = new File(shapeFileName);
            ShapeFile esriShapeFile = new ShapeFile(file);
            ESRIPoly[] polygons;

            System.out.println("Shape Type: " + esriShapeFile.getShapeType());

            if (esriShapeFile.getShapeType() == ShapeFile.SHAPE_TYPE_POINT) {
                ESRIPointRecord esriPointRecord = (ESRIPointRecord) esriShapeFile.getNextRecord();
                SimpleMarkerSymbol simpleMarkerSymbol = new SimpleMarkerSymbol(Color.BLUE, 10, STYLE.CIRCLE);

                while (esriPointRecord != null) {
                    graphicsLayer.addGraphic(new Graphic(
                        new Point(esriPointRecord.getX(), esriPointRecord.getY()),
                        simpleMarkerSymbol));
                    esriPointRecord = (ESRIPointRecord) esriShapeFile.getNextRecord();
                }
                esriShapeFile.close();
            } else if (esriShapeFile.getShapeType() == ShapeFile.SHAPE_TYPE_POLYLINE) {
                /**
                 * Have not figured this out yet.
                 */
            } else if (esriShapeFile.getShapeType() == ShapeFile.SHAPE_TYPE_POLYGON) {

                ESRIPolygonRecord esriPolygonRecord = (ESRIPolygonRecord) esriShapeFile.getNextRecord();
                SimpleFillSymbol simpleFillSymbol = new SimpleFillSymbol(Color.BLUE);

                while (esriPolygonRecord != null) {
                    polygons = esriPolygonRecord.polygons;

                    System.out.println("Number of Polygons Per Record[" + polygons.length + "]: "
                        + esriPolygonRecord.getRecordNumber());

                    for (int i = 0; i < polygons.length; i++) {
                        polygonCount++;

                        ESRIPoly.ESRIFloatPoly poly = (ESRIPoly.ESRIFloatPoly) polygons;

                        System.out.println("Polygon Point Count[: " + esriPolygonRecord.getRecordNumber() + "]: "
                            + poly.nPoints);

                        polygonVertex = new Point(poly.getX(0), poly.getY(0));
                        polygon = new Polygon();
                        polygon.startPath(polygonVertex);

                        for (int j = 1; j < poly.nPoints; j++) {
                            polygonVertex = new Point(poly.getX(j), poly.getY(j));
                            polygon.lineTo(polygonVertex);
                        }
                    }
                    /**
                     * Move inside loop above otherwise it is only displaying one of the polygons per record.
                     */
                    graphicsLayer.addGraphic(new Graphic(polygon, simpleFillSymbol));
                    esriPolygonRecord = (ESRIPolygonRecord) esriShapeFile.getNextRecord();
                }
                esriShapeFile.close();
                // System.out.println("Polygon Count: " + polygonCount);
            }
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        return graphicsLayer;
    }
}

[VivekRane]

where to store the shapefiles in sd card (location path)?

[LukeCatania]

where to store the shapefiles in sd card (location path)?

You can store it where ever you want.  Just create folder on your SD Card.  Usually you create a directory with the same name as your App and then you can create a directory under that.  I call my subdirectory "Features", then I pass the shapefile name with full path to it to the constructor.

[VivekRane]

Is it possible to get attribute from shapefiles and show shapefiles on bing map?

[SolidSmoke]

I ve tried to get the attribute using the following way

     File dbf = new File(Environment.getExternalStorageDirectory()
     + "/islreali/TabaYeud.dbf");
     File shape = new File(Environment.getExternalStorageDirectory()
     + "/islreali/TabaYeud.shp");
     File shx = new File(Environment.getExternalStorageDirectory()
     + "/islreali/TabaYeud.shx");

     try {
            URL dbfUrl = dbf.toURI().toURL();
     EsriPlugIn epi = new EsriPlugIn("name", dbfUrl, shape.toURI().toURL(), shx.toURI().toURL());
            EsriGraphicList eGList = epi.getEsriGraphicList();
     Map<Object, Object> attr = eGList.getAttributes();
  } catch (Exception e) {
       e.printStackTrace();
  }

In the above code, it throws an error when it reach the place wher we use EsriPlugIn. I get Noclassdef error. I think this is not supported in android as read from the below link
http://openmap.bbn.com/mailArchives/openmap-users/2011-03/6671.html


Cud anyone advise me how to read the shapefile attributes by using some other method of openmap or some other api.

[sekharsamanta]

static public GraphicsLayer SHPtoPOINT(String shpfile) {
  SpatialReference lSR = SpatialReference.create(26192);
  Envelope lEnvolope = getSHPEnvelope(shpfile);//to create an extent for your graphics layer
  GraphicsLayer graphicLayer = new GraphicsLayer(lSR, lEnvolope);

  try {
   File file = new File(shpfile);
   ShapeFile shp = new ShapeFile(file);
   ESRIPointRecord e = (ESRIPointRecord) shp.getNextRecord();
   SimpleMarkerSymbol c_point = new SimpleMarkerSymbol(Color.BLACK, 1,
     STYLE.CIRCLE);
   while (e != null) {
    graphicLayer.addGraphic(new Graphic(new Point(e.getX(), e
      .getY()), c_point));
    e = (ESRIPointRecord) shp.getNextRecord();
   }
   shp.close();
  } catch (IOException e1) {
   e1.printStackTrace();
  }
  return graphicLayer;
}

"From where will I get SimpleMarkerSymbol class. I downloaded openmap 5.0 and the jars from there but could not find SimpleMarkerSymbol , Envelope , SpatialReference  classes?"

[LukeCatania]

"From where will I get SimpleMarkerSymbol class. I downloaded openmap 5.0 and the jars from there but could not find SimpleMarkerSymbol , Envelope , SpatialReference  classes?"

Those are all part of the ArcGIS for Android API.

[AnsarRauf]

I want to open polyline shapefile from SD card, can anyone guide on how to convert it into graphics layer? The code above in the thread is for the point and polygon shapefile.

[canwang]

Download code from:

http://www.openmap.org/

and then point to the jar files in the "lib" directory through the Java Build Path Libraries Tab in  Eclsipse

Can you tell me how to use the openmap after add the lib?
or show me a sample/tutorial of open shape file from SD card by openmap.

[LukeCatania]

Can you tell me how to use the openmap after add the lib?
or show me a sample/tutorial of open shape file from SD card by openmap.

That's what the code I posted in this thread shows.  It uses

com.bbn.openmap.layer.shape.ESRIPointRecord;
com.bbn.openmap.layer.shape.ESRIPoly;
com.bbn.openmap.layer.shape.ESRIPolygonRecord;
com.bbn.openmap.layer.shape.ShapeFile;

from openmap.