ArcGIS API For Android离线地图的实现 _JAVA

您所在的位置：程序员俱乐部 > 编程开发 > JAVA > ArcGIS API For Android离线地图的实现

ArcGIS API For Android离线地图的实现

2012/1/10 12:44:10 Virgo_S 程序员俱乐部我要评论(0)

摘要：今天搞了一个ArcGISAPIForAndroid离线地图的实现。效果如下：Android的版本是2.1main.xml，这里要说明的，初始化范围一定要有，不然会不能显示的。<?xmlversion="1.0"encoding="utf-8"?><com.esri.android.map.MapViewxmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/map"android
标签：

今天搞了一个ArcGIS API For Android离线地图的实现。
效果如下：

Android的版本是2.1
main.xml，这里要说明的，初始化范围一定要有，不然会不能显示的。

<?xml version="1.0" encoding="utf-8"?>
<com.esri.android.map.MapView 
     xmlns:android="http://schemas.android.com/apk/res/android" 
     android:id="@+id/map" android:layout_width="fill_parent" 
     android:layout_height="fill_parent"
     initExtent="120.64101459999999 31.280566089 120.6769494 31.303135911">
         
  <com.esri.arcgis.sample.AgsOfflineTiledLayer android:id="@+id/layer"/>
      
</com.esri.android.map.MapView>

AgsLOD.java

package com.esri.arcgis.sample;

import com.esri.core.internal.d.c;

public class AgsLOD extends c {
    private static final long serialVersionUID = 4341699179151728883L;
    
    private int level;
    private double resolution;
    private double scale;

    public AgsLOD(int level, double scale, double resolution) {
	super();

	this.level = level;
	this.scale = scale;
	this.resolution = resolution;
    }

    public int a() {
	return this.level;
    }

    public double b() {
	return this.resolution;
    }

    public double c() {
	return this.scale;
    }
}

AgsOfflineTiledLayer.java

package com.esri.arcgis.sample;

import java.io.File;
import java.util.ArrayList;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;

import com.esri.android.map.TiledLayer;
import com.esri.core.geometry.Envelope;
import com.esri.core.geometry.Point;
import com.esri.core.geometry.SpatialReference;
import com.esri.core.internal.d.c;
import com.esri.core.internal.d.k;
import com.esri.core.map.TiledLayerModel;

public class AgsOfflineTiledLayer extends TiledLayer {

	//瓦片文件的路径呀  
	private String location = "/sdcard/BaseMap/Layers";

	//REST里面的空间参考
	private SpatialReference spatialReference = SpatialReference.create(4326);
	//全图范围
	private Envelope fullExtent = new Envelope(120.64101459999999,
			31.280566089, 120.6769494, 31.303135911);
	private k tileInfo;

	public AgsOfflineTiledLayer(Context context, AttributeSet attrs) {
		super(context, attrs);

		try {
			init();
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}

	@Override
	protected TiledLayerModel initModel() throws Exception {
		return new AgsOfflineTiledLayerModel(location, spatialReference, fullExtent, tileInfo);
	}

	private void init() {
		String confPath = location + File.separator + "conf.xml";

		Log.i("conf", confPath);
		try {
			tileInfo = new k();

			DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory
					.newInstance();
			DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
			File file = new File(confPath);
			Document doc = docBuilder.parse(file);

			NodeList nsX = doc.getElementsByTagName("X");
			double originX = Double.valueOf(nsX.item(0).getFirstChild()
					.getNodeValue());
			NodeList nsY = doc.getElementsByTagName("Y");
			double originY = Double.valueOf(nsY.item(0).getFirstChild()
					.getNodeValue());
			tileInfo.f = new Point(originX, originY);

			NodeList nsTileRows = doc.getElementsByTagName("TileRows");
			tileInfo.a = Integer.valueOf(nsTileRows.item(0).getFirstChild()
					.getNodeValue());

			NodeList nsTileCols = doc.getElementsByTagName("TileCols");
			tileInfo.b = Integer.valueOf(nsTileCols.item(0).getFirstChild()
					.getNodeValue());

			NodeList nsLODInfos = doc.getElementsByTagName("LODInfos");
			tileInfo.h = new ArrayList<c>();
			NodeList lodInfos = nsLODInfos.item(0).getChildNodes();
			for (int j = 0, jcount = lodInfos.getLength(); j < jcount; j++) {
				Node lod = lodInfos.item(j);
				NodeList list = lod.getChildNodes();
				int level = Integer.valueOf(list.item(0).getFirstChild()
						.getNodeValue());
				double scale = Double.valueOf(list.item(1).getFirstChild()
						.getNodeValue());
				double resolution = Double.valueOf(list.item(2).getFirstChild()
						.getNodeValue());
				tileInfo.h.add(new AgsLOD(level, scale, resolution));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

AgsOfflineTiledLayerModel.java

package com.esri.arcgis.sample;

import java.io.File;
import java.io.FileInputStream;

import android.util.Log;

import com.esri.core.geometry.Envelope;
import com.esri.core.geometry.SpatialReference;
import com.esri.core.internal.d.k;
import com.esri.core.map.TiledLayerModel;

public class AgsOfflineTiledLayerModel extends TiledLayerModel {
	private static final long serialVersionUID = 7726567118839553087L;

	private String location;

	public AgsOfflineTiledLayerModel(String location, SpatialReference sr,
			Envelope full, k tileInfo) {
		super(sr, full, tileInfo);

		this.location = location;
	}


	@Override
	public byte[] getTile(int level, int row, int col) throws Exception {
		byte[] result = null;
		try {
			String bundlesDir = location + File.separator + "_alllayers";

			Log.i("location", bundlesDir);
			
			String l = "0" + level;
			int lLength = l.length();
			if (lLength > 2) {
				l = l.substring(lLength - 2);
			}
			l = "L" + l;

			int rGroup = 128 * (row / 128);
			String r = "000" + Integer.toHexString(rGroup);
			int rLength = r.length();
			if (rLength > 4) {
				r = r.substring(rLength - 4);
			}
			r = "R" + r;

			int cGroup = 128 * (col / 128);
			String c = "000" + Integer.toHexString(cGroup);
			int cLength = c.length();
			if (cLength > 4) {
				c = c.substring(cLength - 4);
			}
			c = "C" + c;

			String bundleBase = String
					.format("%s/%s/%s%s", bundlesDir, l, r, c);
			String bundlxFileName = bundleBase + ".bundlx";
			String bundleFileName = bundleBase + ".bundle";

			int index = 128 * (col - cGroup) + (row - rGroup);
			FileInputStream isBundlx = new FileInputStream(bundlxFileName);
			isBundlx.skip(16 + 5 * index);
			byte[] buffer = new byte[5];
			isBundlx.read(buffer);
			long offset = (long) (buffer[0] & 0xff) + (long) (buffer[1] & 0xff)
					* 256 + (long) (buffer[2] & 0xff) * 65536
					+ (long) (buffer[3] & 0xff) * 16777216
					+ (long) (buffer[4] & 0xff) * 4294967296L;

			FileInputStream isBundle = new FileInputStream(bundleFileName);
			isBundle.skip(offset);
			byte[] lengthBytes = new byte[4];
			isBundle.read(lengthBytes);
			int length = (int) (lengthBytes[0] & 0xff)
					+ (int) (lengthBytes[1] & 0xff) * 256
					+ (int) (lengthBytes[2] & 0xff) * 65536
					+ (int) (lengthBytes[3] & 0xff) * 16777216;
			result = new byte[length];
			isBundle.read(result);
		} catch (Exception ex) {
			ex.printStackTrace();
		}

		return result;
	}

}

AgsOfflineTiles.java

package com.esri.arcgis.sample;

import com.esri.android.map.MapView;

import android.app.Activity;
import android.os.Bundle;

public class AgsOfflineTiles extends Activity {
	
	MapView map = null;
	AgsOfflineTiledLayer layer = null;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        map = (MapView) findViewById(R.id.map);
		layer = (AgsOfflineTiledLayer) findViewById(R.id.layer);       
        
    }
}

在SD卡的瓦片数据的路径