Android - 如何在Google Maps API v2上删除多条路线的直线
我有app在地图上设置多条路线。 问题是当我在地图上放两个点时，他会得到建议的路线，但是有一条额外的直线。
我找到了解决方案。我刚刚获得了折线的主要标记 - overview_polyline
在代码中是新的变化：）
pic多条路线 - alternatives=true - 我只设置了一条路
pic - 如果我在xml链接中设置alternatives=false，则直线会消失。
在xml中一切都很好。
我查看了包含alternatives=false和alternatives=true的2个xml文件，但它们完全相同。
提前致谢。
此代码显示信息：
//Polyline
private class GetRouteTask extends AsyncTask<String, Void, String> {
String response = "";
@Override
protected String doInBackground(String... urls) {
//Get All Route values
v2GetRouteDirection = new GMapV2Direction();
document = v2GetRouteDirection.getDocument(latLngFrom, latLngTo, GMapV2Direction.MODE_DRIVING);
response = "Success";
return response;
}
@Override
protected void onPostExecute(String result) {
if(document != null){
ArrayList<LatLng> directionPoint = v2GetRouteDirection.getDirection(document);
PolylineOptions rectLine = new PolylineOptions().width(3).color(Color.RED);
for (int i = 0; i < directionPoint.size(); i++) {
rectLine.add(directionPoint.get(i));
}
// Adding route on the map
map.addPolyline(rectLine);
}
}
}
此代码获取标记信息：
public class GMapV2Direction {
public GMapV2Direction(){}
public final static String MODE_DRIVING = "driving";
public final static String MODE_WALKING = "walking";
public static String error = null;
public Document getDocument(LatLng start, LatLng end, String mode) {
String url = "http://maps.googleapis.com/maps/api/directions/xml?"
+ "origin=" + start.latitude + "," + start.longitude
+ "&destination=" + end.latitude + "," + end.longitude
+ "&sensor=false&units=metric&mode=driving&alternatives=true";
////////////////
//Set TimeOuts
HttpParams httpParameters = new BasicHttpParams();
// Set the timeout in milliseconds until a connection is established.
// The default value is zero, that means the timeout is not used.
int timeoutConnection = 3000;
HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
// Set the default socket timeout (SO_TIMEOUT)
// in milliseconds which is the timeout for waiting for data.
int timeoutSocket = 5000;
HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
try {
HttpClient httpClient = new DefaultHttpClient(httpParameters);
HttpContext localContext = new BasicHttpContext();
HttpGet httpGet = new HttpGet(url);
HttpResponse response = httpClient.execute(httpGet, localContext);
InputStream in = response.getEntity().getContent();
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document doc = builder.parse(in);
return doc;
}
catch (ClientProtocolException e) {
error = "some";
e.printStackTrace();
} catch (IOException e) {
error = "some";
e.printStackTrace();
}
catch (Exception e) {
error = "some";
e.printStackTrace();
}
return null;
}
public ArrayList<LatLng> getDirection (Document doc) {
NodeList error = doc.getElementsByTagName("status");
int p;
Node error1 = null;
//взема последнич елемент на таг
for(p = 0;p<error.getLength();p++){
error1 = error.item(p);
}
if(p==p){
p--;
}
LatLng latLngZero = new LatLng(0.0, 0.0);
ArrayList<LatLng> list = new ArrayList<LatLng>();
list.add(latLngZero);
ArrayList<LatLng> listGeopoints = null;
if(error1.getFirstChild().getTextContent().equals("OK")) {
//new
NodeList routeTag,nl3;
listGeopoints = new ArrayList<LatLng>();
//get tag route
routeTag = doc.getElementsByTagName("route");
if (routeTag.getLength() > 0) {
//get first eelemnt of route
Element routeElement = (Element) routeTag.item(0);
//get tag overview_polyline
NodeList polylineList = routeElement.getElementsByTagName("overview_polyline");
Node node1 = polylineList.item(0);
nl3 = node1.getChildNodes();
Node latNode = nl3.item(getNodeIndex(nl3, "points"));
List<LatLng> arr = decodePoly(latNode.getTextContent());
for (int j = 0; j < arr.size(); j++) {
listGeopoints.add(new LatLng(arr.get(j).latitude, arr.get(j).longitude));
}
}
}
//////////////
else{
return list;
}
return listGeopoints;
}
private int getNodeIndex(NodeList nl, String nodename) {
for(int i = 0 ; i < nl.getLength() ; i++) {
if(nl.item(i).getNodeName().equals(nodename))
return i;
}
return -1;
}
private ArrayList<LatLng> decodePoly(String encoded) {
ArrayList<LatLng> poly = new ArrayList<LatLng>();
int index = 0, len = encoded.length();
int lat = 0, lng = 0;
while (index < len) {
int b, shift = 0, result = 0;
do {
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lat += dlat;
shift = 0;
result = 0;
do {
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lng += dlng;
LatLng position = new LatLng((double) lat / 1E5, (double) lng / 1E5);
poly.add(position);
}
return poly;
}
}
3 个答案:
答案 0 :(得分：1)
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
import com.google.android.gms.maps.model.LatLng;
public class DirectionsJSONParser {
public List<List<List<HashMap<String,String>>>> parse(JSONObject jObject){
List<List<HashMap<String, String>>> routes = new ArrayList<List<HashMap<String,String>>>() ;
List<List<List<HashMap<String,String>>>> routes1 = new ArrayList<List<List<HashMap<String,String>>>>() ;
JSONArray jRoutes = null;
JSONArray jLegs = null;
JSONArray jSteps = null;
try {
jRoutes = jObject.getJSONArray("routes");
/** Traversing all routes */
for(int i=0;i<jRoutes.length();i++){
jLegs = ( (JSONObject)jRoutes.get(i)).getJSONArray("legs");
List path = new ArrayList<HashMap<String, String>>();
List path1 = new ArrayList<ArrayList<HashMap<String,String>>>();
// Log.d("legs",jLegs.toString());
/** Traversing all legs */
for(int j=0;j<jLegs.length();j++){
HashMap<String, String> hm1 = new HashMap<String, String>();
jSteps = ( (JSONObject)jLegs.get(j)).getJSONArray("steps");
// Log.d("steps",jSteps.toString());
/** Traversing all steps */
for(int k=0;k<jSteps.length();k++){
String polyline = "";
polyline = (String)((JSONObject)((JSONObject)jSteps.get(k)).get("polyline")).get("points");
List<LatLng> list = decodePoly(polyline);
// Log.d("polyline",polyline.toString());
/** Traversing all points */
for(int l=0;l<list.size();l++){
HashMap<String, String> hm = new HashMap<String, String>();
hm.put("lat", Double.toString(((LatLng)list.get(l)).latitude) );
hm.put("lng", Double.toString(((LatLng)list.get(l)).longitude) );
path.add(hm);
// Log.d("lat", Double.toString(((LatLng)list.get(l)).latitude));
// Log.d("lng", Double.toString(((LatLng)list.get(l)).longitude));
}
}
path1.add(path);
}
routes1.add(path1);
}
} catch (JSONException e) {
e.printStackTrace();
}catch (Exception e){
}
return routes1;
}
/**
* Method to decode polyline points
* Courtesy : http://jeffreysambells.com/2010/05/27/decoding-polylines-from-google-maps-direction-api-with-java
* */
private List<LatLng> decodePoly(String encoded) {
List<LatLng> poly = new ArrayList<LatLng>();
int index = 0, len = encoded.length();
int lat = 0, lng = 0;
while (index < len) {
int b, shift = 0, result = 0;
do {
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lat += dlat;
shift = 0;
result = 0;
do {
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lng += dlng;
LatLng p = new LatLng((((double) lat / 1E5)),
(((double) lng / 1E5)));
poly.add(p);
}
return poly;
}
}
答案 1 :(得分：0)
面对类似的问题并通过使用addall（）方法将polylineoptions对象直接使用latlng的数组列表在地图上绘制线来进行底层。
无法确认，但尝试此代码可能会有所帮助
折线
private class GetRouteTask extends AsyncTask<String, Void, String> {
String response = "";
@Override
protected String doInBackground(String... urls) {
//Get All Route values
v2GetRouteDirection = new GMapV2Direction();
document = v2GetRouteDirection.getDocument(latLngFrom, latLngTo, GMapV2Direction.MODE_DRIVING);
response = "Success";
return response;
}
@Override
protected void onPostExecute(String result) {
if(document != null){
ArrayList<LatLng> directionPoint = v2GetRouteDirection.getDirection(document);
PolylineOptions rectLine = new PolylineOptions().width(3).color(Color.RED);
rectLine.addall(directionPoint);
// Adding route on the map
map.addPolyline(rectLine);
}
}
}
答案 2 :(得分：0)
LatLng origin = new latlng(type your starting point latitude and longtitude);
LatLng dest = new latlng(type your ending point latitude and longtitude);
// Getting URL to the Google Directions API
String url = getDirectionsUrl(origin, dest);
DownloadTask downloadTask = new DownloadTask();
// Start downloading json data from Google Directions API
downloadTask.execute(url);
private String getDirectionsUrl(LatLng origin, LatLng dest) {
// Origin of route
String str_origin = "origin=" + origin.latitude + "," + origin.longitude;
// Destination of route
String str_dest = "destination=" + dest.latitude + "," + dest.longitude;
// Sensor enabled
String sensor = "sensor=false&alternatives=true&units=metric&mode=driving";
//&alternatives=true&units=metric&mode=driving
// Building the parameters to the web service
String parameters = str_origin + "&" + str_dest + "&" + sensor;
// Output format
String output = "json";
// Building the url to the web service
String url = "https://maps.googleapis.com/maps/api/directions/" + output + "?" + parameters;
return url;
}
/**
* A method to download json data from url
*/
private String downloadUrl(String strUrl) throws IOException {
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try {
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while ((line = br.readLine()) != null) {
sb.append(line);
}
data = sb.toString();
br.close();
} catch (Exception e) {
Log.d("Exception while downloading url", e.toString());
} finally {
iStream.close();
urlConnection.disconnect();
}
return data;
}
// Fetches data from url passed
private class DownloadTask extends AsyncTask<String, Void, String> {
// Downloading data in non-ui thread
@Override
protected String doInBackground(String... url) {
// For storing data from web service
String data = "";
try {
// Fetching the data from web service
data = downloadUrl(url[0]);
} catch (Exception e) {
Log.d("Background Task", e.toString());
}
return data;
}
// Executes in UI thread, after the execution of
// doInBackground()
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
ParserTask parserTask = new ParserTask();
// Invokes the thread for parsing the JSON data
parserTask.execute(result);
}
}
/**
* A class to parse the Google Places in JSON format
*/
private class ParserTask extends AsyncTask<String, Integer, List<List<List<HashMap<String, String>>>>> {
// Parsing the data in non-ui thread
@Override
protected List<List<List<HashMap<String, String>>>> doInBackground(String... jsonData) {
JSONObject jObject;
List<List<List<HashMap<String, String>>>> routes = null;
try {
jObject = new JSONObject(jsonData[0]);
DirectionsJSONParser parser = new DirectionsJSONParser();
// Starts parsing data
routes = parser.parse(jObject);
} catch (Exception e) {
e.printStackTrace();
}
return routes;
}
// Executes in UI thread, after the parsing process
@Override
protected void onPostExecute(List<List<List<HashMap<String, String>>>> result) {
ArrayList<LatLng> points = null;
PolylineOptions lineOptions = new PolylineOptions();
PolylineOptions lineOptions1 = null;
MarkerOptions markerOptions = new MarkerOptions();
String distance = "";
String duration = "";
Log.d("resultsize", result.size() + "");
int i = 0;
while (i < result.size()) {
// for(int i=0;i<result.size();i++){
//result.size()
//int g= i-1;
points = new ArrayList<LatLng>();
// lineOptions = new PolylineOptions();
// if(i==1){
// }else{
List<List<HashMap<String, String>>> path1 = result.get(i);
for (int s = 0; s < path1.size(); s++) {
Log.d("pathsize1", path1.size() + "");
// Fetching i-th route
List<HashMap<String, String>> path = path1.get(s);
Log.d("pathsize", path.size() + "");
// Fetching all the points in i-th route
for (int j = 0; j < path.size(); j++) {
lineOptions1 = new PolylineOptions();
HashMap<String, String> point = path.get(j);
// points = new ArrayList<LatLng>();
// if(j==0){ // Get distance from the list
// distance = (String)point.get("distance");
// continue;
// }else if(j==1){ // Get duration from the list
// duration = (String)point.get("duration");
// continue;
// }
double lat = Double.parseDouble(point.get("lat"));
double lng = Double.parseDouble(point.get("lng"));
LatLng position = new LatLng(lat, lng);
// Log.d("latlng", position.toString());
points.add(position);
}
// lineOptions.addAll(points);
// lineOptions.width(5);
// lineOptions.color(Color.BLUE);
// map.addPolyline(lineOptions);
}
// }
if (i == 0) {
PolylineOptions line1 = new PolylineOptions();
line1.addAll(points);
line1.width(5);
line1.color(Color.RED);
map.addPolyline(line1);
} else if (i == 1) {
PolylineOptions line2 = new PolylineOptions();
line2.addAll(points);
line2.width(5);
line2.color(Color.BLUE);
map.addPolyline(line2);
} else if (i == 2) {
PolylineOptions line3 = new PolylineOptions();
line3.addAll(points);
line3.width(5);
line3.color(Color.GREEN);
map.addPolyline(line3);
}
// Adding all the points in the route to LineOptions
i++;
//
}
// Drawing polyline in the Google Map for the i-th route
// map.addPolyline(lineOptions);
}
}
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