在google map v2 android中绘制两个位置之间的道路
我正在尝试在我提供的两个位置之间绘制一条道路/路径,我的代码目前如下所示:在google map v2 android中绘制两个位置之间的道路,android,google-maps,Android,Google Maps,我正在尝试在我提供的两个位置之间绘制一条道路/路径,我的代码目前如下所示: map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap(); LatLng lt = new LatLng(35.7687310, -5.8280540); map.addMarker(new MarkerOptions().position(lt).title("Home")); LatLng lt2 = new Lat
map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
LatLng lt = new LatLng(35.7687310, -5.8280540);
map.addMarker(new MarkerOptions().position(lt).title("Home"));
LatLng lt2 = new LatLng(35.7462510, -5.8481330);
map.addMarker(new MarkerOptions().position(lt2).title("School"));
我需要在两个标记之间画一个道路方向,谢谢
我一直在寻找解决方案,但大多数都是旧的&在崩溃时无法运行它们。。。
我希望你能帮忙,谢谢
编辑:
我的主要问题是,我试图在另一个不包含相同包名的项目上使用我的api,谢谢大家的帮助;) 试试这个:
if(googleMap==null){
googleMap=((MapFragment)getFragmentManager().findFragmentById(
R.id.map_)).getMap();
googleMap.clear();
googleMap.setMapType(googleMap.MAP\u TYPE\u NORMAL);
V2GetroutedDirection=新的GMAPv2etroutedDirection();
字符串url=getDirectionsUrl(新LatLng(源纬度,源纬度),新LatLng(目的纬度,目的纬度));
DownloadTask DownloadTask=新的DownloadTask();
//开始从Google Directions API下载json数据
downloadTask.execute(url);
//检查是否成功创建映射
if(googleMap==null){
Toast.makeText(Ride_Share.this,
“抱歉!无法创建地图”,Toast.LENGTH\u SHORT)
.show();
}
}
私有字符串getDirectionsUrl(LatLng来源,LatLng目的地){
//路线起点
字符串str_origin=“origin=“+origin.latitude+”,“+origin.longitude;
//路线目的地
字符串str_dest=“destination=”+dest.latitude+”,“+dest.longitude;
//传感器启用
字符串sensor=“sensor=false”;
//为web服务构建参数
字符串参数=str_origin+“&”+str_dest+“&”+传感器;
//输出格式
字符串输出=“json”;
//构建web服务的url
字符串url=”https://maps.googleapis.com/maps/api/directions/“+输出+”?“+参数;
返回url;
}
/**从url下载json数据的方法*/
私有字符串下载URL(字符串strUrl)引发IOException{
字符串数据=”;
InputStream iStream=null;
HttpURLConnection-urlConnection=null;
试一试{
URL=新URL(strUrl);
//创建http连接以与url通信
urlConnection=(HttpURLConnection)url.openConnection();
//连接到url
urlConnection.connect();
//从url读取数据
iStream=urlConnection.getInputStream();
BufferedReader br=新的BufferedReader(新的InputStreamReader(iStream));
StringBuffer sb=新的StringBuffer();
字符串行=”;
而((line=br.readLine())!=null){
某人附加(行);
}
data=sb.toString();
br.close();
}捕获(例外e){
Log.d(“下载url时出现异常”,例如toString());
}最后{
iStream.close();
urlConnection.disconnect();
}
返回数据;
}
//从传递的url获取数据
私有类DownloadTask扩展了AsyncTask{
//在非ui线程中下载数据
@凌驾
受保护的字符串doInBackground(字符串…url){
//用于存储来自web服务的数据
字符串数据=”;
试一试{
//从web服务获取数据
数据=下载url(url[0]);
}捕获(例外e){
Log.d(“后台任务”,例如toString());
}
返回数据;
}
//在UI线程中执行,在
//doInBackground()
@凌驾
受保护的void onPostExecute(字符串结果){
super.onPostExecute(结果);
ParserTask ParserTask=新的ParserTask();
//调用线程以解析JSON数据
执行(结果);
}
}
/**以JSON格式解析GooglePlaces的类*/
私有类ParserTask扩展了AsyncTask{
//解析非ui线程中的数据
@凌驾
受保护列表doInBackground(字符串…jsonData){
JSONObject jObject;
列表路由=空;
试一试{
jObject=新的JSONObject(jsonData[0]);
DirectionsJSONParser=新的DirectionsJSONParser();
//开始解析数据
routes=parser.parse(jObject);
}捕获(例外e){
e、 printStackTrace();
}
返回路线;
}
//解析过程后,在UI线程中执行
@凌驾
受保护的void onPostExecute(列表结果){
ArrayList points=null;
PolylineOptions lineOptions=null;
MarkerOptions MarkerOptions=新MarkerOptions();
字符串距离=”;
字符串持续时间=”;
if(result.size()1):(result>>1));
lat+=dlat;
移位=0;
结果=0;
做{
b=编码的.charAt(索引++)-63;
结果|=(b&0x1f)=0x20);
int-dlng=((结果&1)!=0?~(结果>>1):(结果>>1));
液化天然气+=液化天然气;
车床位置=新车床((双)车床/1E5,(双)车床/1E5);
poly.add(位置);
}
返回多边形;
}
}
如果您遇到任何问题,请告诉我。请添加您自己实现的代码。不要只是复制粘贴代码@PiyushGupta..这些代码有什么问题…上面的代码在我的应用程序中运行良好..如果是,那么你只需要共享链接,不要复制粘贴代码。这是什么意思。只是为了赢得名声?@PiyushGupta我只是想
Try this one:
if (googleMap == null) {
googleMap = ((MapFragment)getFragmentManager().findFragmentById(
R.id.map_rideshare)).getMap();
googleMap.clear();
googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
v2GetRouteDirection = new GMapV2GetRouteDirection();
String url = getDirectionsUrl(new LatLng(source_lat,source_long), new LatLng(destination_lat,destination_long));
DownloadTask downloadTask = new DownloadTask();
// Start downloading json data from Google Directions API
downloadTask.execute(url);
// check if map is created successfully or not
if (googleMap == null) {
Toast.makeText(Ride_Share.this,
"Sorry! unable to create maps", Toast.LENGTH_SHORT)
.show();
}
}
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";
// 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<HashMap<String,String>>> >{
// Parsing the data in non-ui thread
@Override
protected List<List<HashMap<String, String>>> doInBackground(String... jsonData) {
JSONObject jObject;
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<HashMap<String, String>>> result) {
ArrayList<LatLng> points = null;
PolylineOptions lineOptions = null;
MarkerOptions markerOptions = new MarkerOptions();
String distance = "";
String duration = "";
if(result.size()<1){
//Toast.makeText(getBaseContext(), "No Points", Toast.LENGTH_SHORT).show();
return;
}
// Traversing through all the routes
for(int i=0;i<result.size();i++){
points = new ArrayList<LatLng>();
lineOptions = new PolylineOptions();
// Fetching i-th route
List<HashMap<String, String>> path = result.get(i);
// Fetching all the points in i-th route
for(int j=0;j<path.size();j++){
HashMap<String,String> point = path.get(j);
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);
points.add(position);
}
// Adding all the points in the route to LineOptions
lineOptions.addAll(points);
lineOptions.width(4);
lineOptions.color(Color.GRAY);
}
//tvDistanceDuration.setText("Distance:"+distance + ", Duration:"+duration);
// Drawing polyline in the Google Map for the i-th route
googleMap.addPolyline(lineOptions);
}
}
import java.io.InputStream;
import java.util.ArrayList;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import android.util.Log;
import com.google.android.gms.maps.model.LatLng;
public class GMapV2GetRouteDirection {
public final static String MODE_DRIVING = "driving";
public final static String MODE_WALKING = "walking";
public GMapV2GetRouteDirection() { }
public Document getDocument(LatLng start, LatLng end, String mode) {
Log.i("GMAP", "step2");
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";
Log.i("url", url);
Log.i("GMAP", "step3");
try {
Log.i("GMAP", "step4");
HttpClient httpClient = new DefaultHttpClient();
Log.i("GMAP", "step5");
HttpContext localContext = new BasicHttpContext();
Log.i("GMAP", "step6");
HttpPost httpPost = new HttpPost(url);
Log.i("GMAP", "step7");
HttpResponse response = httpClient.execute(httpPost, localContext);
Log.i("GMAP", "step8");
InputStream in = response.getEntity().getContent();
Log.i("GMAP", "step9");
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Log.i("GMAP", "step10");
Document doc = builder.parse(in);
Log.i("GMAP", "step11");
return doc;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public String getDurationText (Document doc) {
NodeList nl1 = doc.getElementsByTagName("duration");
Node node1 = nl1.item(0);
NodeList nl2 = node1.getChildNodes();
Node node2 = nl2.item(getNodeIndex(nl2, "text"));
Log.i("DurationText", node2.getTextContent());
return node2.getTextContent();
}
public int getDurationValue (Document doc) {
NodeList nl1 = doc.getElementsByTagName("duration");
Node node1 = nl1.item(0);
NodeList nl2 = node1.getChildNodes();
Node node2 = nl2.item(getNodeIndex(nl2, "value"));
Log.i("DurationValue", node2.getTextContent());
return Integer.parseInt(node2.getTextContent());
}
public String getDistanceText (Document doc) {
NodeList nl1 = doc.getElementsByTagName("distance");
Node node1 = nl1.item(0);
NodeList nl2 = node1.getChildNodes();
Node node2 = nl2.item(getNodeIndex(nl2, "text"));
Log.i("DistanceText", node2.getTextContent());
return node2.getTextContent();
}
public int getDistanceValue (Document doc) {
NodeList nl1 = doc.getElementsByTagName("distance");
Node node1 = nl1.item(0);
NodeList nl2 = node1.getChildNodes();
Node node2 = nl2.item(getNodeIndex(nl2, "value"));
Log.i("DistanceValue", node2.getTextContent());
return Integer.parseInt(node2.getTextContent());
}
public String getStartAddress (Document doc) {
NodeList nl1 = doc.getElementsByTagName("start_address");
Node node1 = nl1.item(0);
Log.i("StartAddress", node1.getTextContent());
return node1.getTextContent();
}
public String getEndAddress (Document doc) {
NodeList nl1 = doc.getElementsByTagName("end_address");
Node node1 = nl1.item(0);
Log.i("StartAddress", node1.getTextContent());
return node1.getTextContent();
}
public String getCopyRights (Document doc) {
NodeList nl1 = doc.getElementsByTagName("copyrights");
Node node1 = nl1.item(0);
Log.i("CopyRights", node1.getTextContent());
return node1.getTextContent();
}
public ArrayList<LatLng> getDirection (Document doc) {
NodeList nl1, nl2, nl3;
ArrayList<LatLng> listGeopoints = new ArrayList<LatLng>();
nl1 = doc.getElementsByTagName("step");
if (nl1.getLength() > 0) {
for (int i = 0; i < nl1.getLength(); i++) {
Node node1 = nl1.item(i);
nl2 = node1.getChildNodes();
Node locationNode = nl2.item(getNodeIndex(nl2, "start_location"));
nl3 = locationNode.getChildNodes();
Node latNode = nl3.item(getNodeIndex(nl3, "lat"));
double lat = Double.parseDouble(latNode.getTextContent());
Node lngNode = nl3.item(getNodeIndex(nl3, "lng"));
double lng = Double.parseDouble(lngNode.getTextContent());
listGeopoints.add(new LatLng(lat, lng));
locationNode = nl2.item(getNodeIndex(nl2, "polyline"));
nl3 = locationNode.getChildNodes();
latNode = nl3.item(getNodeIndex(nl3, "points"));
ArrayList<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));
}
locationNode = nl2.item(getNodeIndex(nl2, "end_location"));
nl3 = locationNode.getChildNodes();
latNode = nl3.item(getNodeIndex(nl3, "lat"));
lat = Double.parseDouble(latNode.getTextContent());
lngNode = nl3.item(getNodeIndex(nl3, "lng"));
lng = Double.parseDouble(lngNode.getTextContent());
listGeopoints.add(new LatLng(lat, lng));
}
}
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;
}
}