我正在寻找Google Map API来查找Android中两个地方之间的路径。
一个地方将从Android应用程序修复，用户将输入Destination Place，然后用户将获得这两个地方之间的路径，这仅在Android活动内。·
怎么弄这个？
答案 0 :(得分：0)
使用以下代码显示两个目的地之间的路： -
private class GetDirectionDialog extends AsyncTask<String, Integer, String>
{
@Override
protected void onPreExecute()
{
dialog = new ProgressDialog(EventDetailLocation.this);
dialog.setIndeterminate(true);
dialog.setCancelable(false);
dialog.show();
}
@Override
protected String doInBackground(String... params)
{
String result="";
try
{
LatLng fromPosition = new LatLng(e_lat, e_lng); // enter user location lat and long
LatLng toPosition = new LatLng(GPSTracker.latitude, GPSTracker.longitude);// fixed location
GMapV2Direction md = new GMapV2Direction();
Document doc = md.getDocument(fromPosition, toPosition, GMapV2Direction.MODE_WALKING);
ArrayList<LatLng> directionPoint = md.getDirection(doc);
rectLine = new PolylineOptions().width(3).color(Color.BLUE);
for(int i = 0 ; i < directionPoint.size() ; i++)
{
rectLine.add(directionPoint.get(i));
}
return result;
}
catch (Exception e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return result;
}
PolylineOptions rectLine;
@Override
protected void onPostExecute(String result)
{
super.onPostExecute(result);
dialog.dismiss();
try
{
map.addPolyline(rectLine);
}
catch (Exception e)
{
// TODO: handle exception
e.printStackTrace();
}
}
}
<强> GMapV2Direction.java
public class GMapV2Direction
{
public final static String MODE_DRIVING = "driving";
public final static String MODE_WALKING = "walking";
public GMapV2Direction()
{
}
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";
try
{
HttpClient httpClient = new DefaultHttpClient();
HttpContext localContext = new BasicHttpContext();
HttpPost httpPost = new HttpPost(url);
HttpResponse response = httpClient.execute(httpPost, localContext);
InputStream in = response.getEntity().getContent();
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document doc = builder.parse(in);
return doc;
}
catch (Exception e)
{
e.printStackTrace();
}
return null;
}
public String getDurationText(Document doc)
{
NodeList nl1 = doc.getElementsByTagName("duration");
Node node1 = nl1.item(nl1.getLength() - 1);
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(nl1.getLength() - 1);
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(nl1.getLength() - 1);
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(nl1.getLength() - 1);
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;
}
}