在google地图上画出两个地点的行走路线
Google Direction API提供了更丰富的路线信息数据。由于访问量过大吧，谷歌现在不提供了查询路线的接口API，现在要想获得一个路线我们可以通过URL访问google然后解析得到的KML文件，得到路线的每个点的经纬度，然互在一个图层上画出这些点。代码来自于对一些网上资源的整理，一共提供了连个方法，一个通过两个地方的名字，一个是通过两个地点的经纬度，但是有时候会出现错误的别是对中国的城市，还有就是别用中文，要不会很惨，希望有人给出一个更好的方法
[图片] 未命名1.jpg
[代码] 新建一个图层
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package com.android.antkingwei.google.direction; |
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|
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import android.graphics.Canvas; |
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import android.graphics.Color; |
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import android.graphics.Paint; |
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import android.graphics.Point; |
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|
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import com.google.android.maps.GeoPoint; |
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import com.google.android.maps.MapView; |
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import com.google.android.maps.Overlay; |
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import com.google.android.maps.Projection; |
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|
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public class DirectionPathOverlay extends Overlay { |
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private GeoPoint gp1; |
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private GeoPoint gp2; |
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|
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public DirectionPathOverlay(GeoPoint gp1, GeoPoint gp2) { |
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this.gp1 = gp1; |
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this.gp2 = gp2; |
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} |
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|
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@Override |
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public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when) { |
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Projection projection = mapView.getProjection(); |
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if(shadow == false) { |
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Paint paint = new Paint(); |
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paint.setAntiAlias(true); |
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Point point = new Point(); |
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projection.toPixels(gp1, point); |
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paint.setColor(Color.BLUE); |
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Point point2 = new Point(); |
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projection.toPixels(gp2, point2); |
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paint.setStrokeWidth(2); |
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canvas.drawLine((float) point.x, (float) point.y, (float) point2.x, (float) point2.y, paint); |
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} |
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return super.draw(canvas, mapView, shadow, when); |
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} |
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|
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@Override |
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public void draw(Canvas canvas, MapView mapView, boolean shadow) { |
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super.draw(canvas, mapView, shadow); |
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} |
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} |
[代码] 主类
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package com.android.antkingwei.google.direction; |
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|
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import java.net.HttpURLConnection; |
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import java.net.URL; |
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|
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import javax.xml.parsers.DocumentBuilder; |
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import javax.xml.parsers.DocumentBuilderFactory; |
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|
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import org.w3c.dom.Document; |
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import org.w3c.dom.Node; |
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import org.w3c.dom.NodeList; |
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|
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import com.google.android.maps.GeoPoint; |
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import com.google.android.maps.MapActivity; |
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import com.google.android.maps.MapController; |
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import com.google.android.maps.MapView; |
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|
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import android.app.Activity; |
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import android.os.Bundle; |
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import android.util.Log; |
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|
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public class MainActivity extends MapActivity { |
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private MapView myMapView; |
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private GeoPoint geoPoint; |
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private MapController myMC; |
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private String[] pairs; |
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/** Called when the activity is first created. */ |
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@Override |
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public void onCreate(Bundle savedInstanceState) { |
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super.onCreate(savedInstanceState); |
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setContentView(R.layout.main); |
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|
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myMapView = (MapView) findViewById(R.id.mapview); |
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geoPoint = null; |
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myMapView.setSatellite(false); |
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//通过地名 |
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//pairs = getDirectionData("ahmedabad", "vadodara"); |
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//通过四个坐标 |
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pairs = getUrl(22.5348,113.97246,35.422006,119.524095); |
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String[] lngLat = pairs[0].split(","); |
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// STARTING POINT |
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GeoPoint startGP = new GeoPoint((int)(Double.parseDouble(lngLat[1]) * 1E6), (int) (Double.parseDouble(lngLat[0]) * 1E6)); |
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myMC = myMapView.getController(); |
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geoPoint = startGP; |
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myMC.setCenter(geoPoint); |
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myMC.setZoom(8); |
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myMapView.getOverlays().add(new DirectionPathOverlay(startGP, startGP)); |
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// NAVIGATE THE PATH |
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GeoPoint gp1; |
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GeoPoint gp2 = startGP; |
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for (int i = 1; i < pairs.length; i++) { |
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lngLat = pairs[i].split(","); |
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gp1 = gp2; |
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// watch out! For GeoPoint, first:latitude, second:longitude |
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gp2 = new GeoPoint((int) (Double.parseDouble(lngLat[1]) * 1E6),(int) (Double.parseDouble(lngLat[0]) * 1E6)); |
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myMapView.getOverlays().add(new DirectionPathOverlay(gp1, gp2)); |
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Log.d("xxx", "pair:" + pairs[i]); |
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} |
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// END POINT |
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myMapView.getOverlays().add(new DirectionPathOverlay(gp2, gp2)); |
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myMapView.getController().animateTo(startGP); |
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myMapView.setBuiltInZoomControls(true); |
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myMapView.displayZoomControls(true); |
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|
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} |
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@Override |
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protected boolean isRouteDisplayed() { |
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// TODO Auto-generated method stub |
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return false; |
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} |
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/** |
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* 通过四个坐标点，获得KML然后通过DOM解析 |
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* @param fromLat |
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* @param fromLon |
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* @param toLat |
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* @param toLon |
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* @return |
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*/ |
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public String[] getUrl(double fromLat,double fromLon,double toLat,double toLon){ |
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String urlString = "http://maps.google.com/maps?f=d&hl=en&saddr="+fromLat+","+fromLon+"&daddr="+toLat+","+toLon+"&ie=UTF8&0&om=0&output=kml"; |
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Log.d("URL", urlString); |
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Document doc = null; |
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HttpURLConnection urlConnection = null; |
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URL url = null; |
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String pathConent = ""; |
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|
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try{ |
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url = new URL(urlString.toString()); |
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urlConnection = (HttpURLConnection) url.openConnection(); |
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urlConnection.setRequestMethod("GET"); |
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urlConnection.setDoOutput(true); |
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urlConnection.setDoInput(true); |
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urlConnection.connect(); |
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DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); |
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DocumentBuilder db = dbf.newDocumentBuilder(); |
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doc = db.parse(urlConnection.getInputStream()); |
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} catch (Exception e){} |
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NodeList nl = doc.getElementsByTagName("LineString"); |
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for(int s=0; s< nl.getLength(); s++){ |
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Node rootNode = nl.item(s); |
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NodeList configItems = rootNode.getChildNodes(); |
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for(int x=0; x < configItems.getLength(); x++) { |
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Node lineStringNode = configItems.item(x); |
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NodeList path = lineStringNode.getChildNodes(); |
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pathConent = path.item(0).getNodeValue(); |
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} |
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} |
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String[] tempContent = pathConent.split(" "); |
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return tempContent; |
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} |
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/** |
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* 通过连个地名获得KML然后进行DOM解析 |
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* @param srcPlace |
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* @param destPlace |
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* @return |
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*/ |
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private String[] getDirectionData(String srcPlace, String destPlace) { |
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String urlString = "http://maps.google.com/maps?f=d&hl=en&saddr="+srcPlace+"&daddr="+destPlace+"&ie=UTF&om=0&output=kml"; |
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Log.d("URL", urlString); |
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Document doc = null; |
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HttpURLConnection urlConnection = null; |
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URL url = null; |
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String pathConent = ""; |
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try{ |
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url = new URL(urlString.toString()); |
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urlConnection = (HttpURLConnection) url.openConnection(); |
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urlConnection.setRequestMethod("GET"); |
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urlConnection.setDoOutput(true); |
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urlConnection.setDoInput(true); |
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urlConnection.connect(); |
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DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); |
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DocumentBuilder db = dbf.newDocumentBuilder(); |
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doc = db.parse(urlConnection.getInputStream()); |
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} catch (Exception e){} |
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NodeList nl = doc.getElementsByTagName("LineString"); |
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for(int s=0; s< nl.getLength(); s++){ |
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Node rootNode = nl.item(s); |
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NodeList configItems = rootNode.getChildNodes(); |
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for(int x=0; x < configItems.getLength(); x++) { |
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Node lineStringNode = configItems.item(x); |
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NodeList path = lineStringNode.getChildNodes(); |
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pathConent = path.item(0).getNodeValue(); |
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} |
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} |
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String[] tempContent = pathConent.split(" "); |
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return tempContent; |
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} |
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} |
[代码] main.xml
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<?xml version="1.0" encoding="utf-8"?> |
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" |
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android:orientation="vertical" |
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android:layout_width="fill_parent" |
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android:layout_height="fill_parent" |
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> |
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<TextView |
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android:layout_width="fill_parent" |
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android:layout_height="wrap_content" |
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android:text="@string/hello" |
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/> |
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<com.google.android.maps.MapView |
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xmlns:android="http://schemas.android.com/apk/res/android" |
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android:id="@+id/mapview" |
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android:layout_width="fill_parent" |
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android:layout_height="fill_parent" |
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android:enabled="true" |
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android:clickable="true" |
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android:apiKey="0FZLYf-YM4SRrJrJum55MeeaO4Gd_IitVFmtUeA"/> |
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</LinearLayout> |
[代码] AndroidManifest.xml
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<?xml version="1.0" encoding="utf-8"?> |
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<manifest xmlns:android="http://schemas.android.com/apk/res/android" |
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package="com.android.antkingwei.google.direction" |
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android:versionCode="1" |
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android:versionName="1.0"> |
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<uses-sdk android:minSdkVersion="7" /> |
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|
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<application android:icon="@drawable/icon" android:label="@string/app_name"> |
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<activity android:name=".MainActivity" |
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android:label="@string/app_name"> |
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<intent-filter> |
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<action android:name="android.intent.action.MAIN" /> |
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<category android:name="android.intent.category.LAUNCHER" /> |
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</intent-filter> |
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|
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</activity> |
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<uses-library android:name="com.google.android.maps" /> |
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</application> |
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<uses-permission android:name="android.permission.INTERNET"></uses-permission> |
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<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> |
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<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> |
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<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> |
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</manifest> |
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