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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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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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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public class DirectionPathOverlay extends Overlay {
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private GeoPoint gp1;
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private GeoPoint gp2;
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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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@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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@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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}
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[代码] 主类
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package com.android.antkingwei.google.direction;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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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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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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import android.app.Activity;
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import android.os.Bundle;
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import android.util.Log;
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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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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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@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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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>
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[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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<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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</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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