我正在使用http://iamvijayakumar.blogspot.in/2013/04/android-draw-route-between-two-geo.html此链接成功地在一个位置到另一个位置之间绘制路线，现在我正在尝试在当前位置之间绘制路线到我所拥有的arrylist的所有位置。但是这里仅从当前添加一个路线arrylist的最后一个元素的位置。但我想从当前位置绘制路线到所有位置。
以下是代码：
public class ShowAllRoutesFromCurrentLoc extends FragmentActivity implements LocationListener {
GoogleMap _googlemap;
LocationManager locationManager;
private LatLng myPosition;
private LatLng dabaseLocations;
Document document;
private GMapV2Direction v2GetRouteDirection;
private ArrayList<HashMap<String, String>> arl;
private ArrayList<LatLng> dbList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_shoe_all_routes_from_current_loc);
_googlemap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(
R.id.mapRotes)).getMap();
v2GetRouteDirection = new GMapV2Direction();
locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
String provider = locationManager.getBestProvider(criteria, true);
locationManager.requestLocationUpdates(provider, 0, 0, this);
arl=(ArrayList<HashMap<String, String>>)
getIntent().getSerializableExtra("arrayList");
dbList = new ArrayList<LatLng>();
Log.e("SHOW LOGIN", arl.toString());
if(arl.size()!=0){
for(int j = 0;j<arl.size();j++){
String lat =arl.get(j).get("lat").toString();
String lng =arl.get(j).get("lng").toString();
if ( !lat.trim().equals("") && !lng.trim().equals("") ) {
double Hlat = Double.parseDouble(lat.trim());
double Hlong= Double.parseDouble(lng.trim());
dabaseLocations =new LatLng(Hlat, Hlong);
dbList.add(dabaseLocations);
Log.e("ARRAY1",""+dbList.size());
}
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater()
.inflate(R.menu.shoe_all_routes_from_current_loc, menu);
return true;
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
//_googlemap.clear();
if(location!=null){
double latitude = location.getLatitude();
double langitude = location.getLongitude();
myPosition = new LatLng(latitude, langitude);
}
(new GetRouteAsync()).execute();
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
private class GetRouteAsync extends AsyncTask<String, Void, String>{
private ArrayList<String> alter;
private ArrayList<LatLng> directionPoint;
private PolylineOptions rectLine;
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
Log.e("ARRAY2",""+dbList.size());
for(int k=0;k<dbList.size();k++){
document = v2GetRouteDirection.getDocument(myPosition,
dbList.get(k),GMapV2Direction.MODE_DRIVING,dbList.size());
}
return null;
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
_googlemap.clear();
for(int k=0;k<dbList.size();k++){
directionPoint =v2GetRouteDirection.getSingleDirection(document);
rectLine = new
PolylineOptions().width(5).color(Color.RED).geodesic(true);
for (int i = 0; i < directionPoint.size(); i++) {
rectLine.add(directionPoint.get(i));
}
_googlemap.addPolyline(rectLine);
_googlemap.moveCamera(CameraUpdateFactory.newLatLngZoom(myPosition,10));
Log.e("ARRAY3",""+dbList.size());
Marker HYD = _googlemap.addMarker(new MarkerOptions()
.position(dbList.get(k))
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED))
.flat(true));
// Show current location with database locations
Marker m=_googlemap.addMarker(new MarkerOptions()
.position(myPosition).title("start")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));
// HYD.setPosition(new LatLng(5,5));
}
}
}
}
GMapV2GetRouteDirection.java
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) {
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(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;
}
}
答案 0 :(得分：2)
首先，您必须了解每个新位置都必须调用XML请求。每个请求都是它自己的一组点，Android用它们在点A和点B之间绘制多边形线。
我首先使用2-D ArrayList来存储每个XML返回，然后迭代列表以绘制线条。您将不得不查看每组点连接，然后调用该函数在这些点之间绘制线条，然后移动到下一组点。