嗨，我是在google Map API中更改后第一次在 android中使用地图。
现在我想在我为API v2提供的两个地址之间的地图上绘制路线。我不知道该怎么做。我为此做了很多尝试。请帮我。谢谢。
我的代码是：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.start_trip_view);
try {
ArrayList<String> location = new ArrayList<String>();
Intent ii = getIntent();
location2 = (ii.getStringExtra("place"));
String location3 = (ii.getStringExtra("start"));
gps = new GPSTracker(getApplicationContext());
latitude = gps.getLatitude();
longitude = gps.getLongitude();
Balvinder = new LatLng(latitude, longitude);
markerPoints = new ArrayList<LatLng>();
map = ((MapFragment) getFragmentManager()
.findFragmentById(R.id.map)).getMap();
map.setMyLocationEnabled(true);
//
if (location == null || location.equals("")) {
Toast.makeText(getBaseContext(), "No Place is entered",
Toast.LENGTH_SHORT).show();
return;
}
String url = "https://maps.googleapis.com/maps/api/geocode/json?";
// for(int i=0; i<location.size();i++)
// {
try {
// encoding special characters like space in the user input
// place
location2 = URLEncoder.encode(location2, "utf-8");
// location3 = URLEncoder.encode(location3, "utf-8");
String saddress = "address=" + location2;
// String Dsaddress = "address=" + location3;
String sensor = "sensor=false";
// url , from where the geocoding data is fetched
url = url + saddress + "&" + sensor;
DownloadTask downloadTask = new DownloadTask();
// Start downloading the geocoding places
downloadTask.execute(url);
}
private String downloadUrl(String... strUrl) throws IOException {
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try {
for(int i=0;i<strUrl.length;i++)
{
URL url = new URL(strUrl[i]);
// 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, Integer, String> {
String data = null;
// Invoked by execute() method of this object
@Override
protected String doInBackground(String... url) {
try {
for(int i=0;i<url.length;i++)
{
data = downloadUrl(url[i]);
}
} catch (Exception e) {
Log.d("Background Task", e.toString());
}
return data;
}
// Executed after the complete execution of doInBackground() method
@Override
protected void onPostExecute(String result) {
// Instantiating ParserTask which parses the json data from
// Geocoding webservice
// in a non-ui thread
ParserTask parserTask = new ParserTask();
parserTask.execute(result);
}
System.out.println("Result"+result);
}
}
/** A class to parse the Google Places in JSON format */
class ParserTask extends
AsyncTask<String, Integer, List<HashMap<String, String>>> {
JSONObject jObject;
// Invoked by execute() method of this object
@Override
protected List<HashMap<String, String>> doInBackground(
String... jsonData) {
List<HashMap<String, String>> places = null;
GeocodeJSONParser parser = new GeocodeJSONParser();
try {
jObject = new JSONObject(jsonData[0]);
/** Getting the parsed data as a an ArrayList */
places = parser.parse(jObject);
} catch (Exception e) {
Log.d("Exception", e.toString());
}
return places;
}
// Executed after the complete execution of doInBackground() method
@Override
protected void onPostExecute(List<HashMap<String, String>> list) {
PolylineOptions lineOptions = new PolylineOptions();
ArrayList<LatLng>points=new ArrayList<LatLng>();
// Clears all the existing markers
map.clear();
for (int i = 0; i < list.size(); i++) {
// Creating a marker
MarkerOptions markerOptions = new MarkerOptions();
// Getting a place from the places list
HashMap<String, String> hmPlace = list.get(i);
// Getting latitude of the place
lat = Double.parseDouble(hmPlace.get("lat"));
// Getting longitude of the place
lng = Double.parseDouble(hmPlace.get("lng"));
// Getting name
String name = hmPlace.get("formatted_address");
latLng = new LatLng(lat, lng);
// Setting the position for the marker
markerOptions.position(latLng);
// getDirectionsUrl(Balvinder, latLng);
// markerOptions.position(Balvinder);
.show();
map.addMarker(new MarkerOptions().title("My Location").snippet(
gps.ConvertPointToLocation(latitude, longitude,
StartTripView.this))
.position(Balvinder)
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.logo_sono)));
markerPoints.add(Balvinder);
markerPoints.add(latLng);
//makeURL(latitude, longitude, lat, lng);
System.out.println("Result"+makeURL(latitude, longitude, lat, lng));
// Polyline line = map.addPolyline(new PolylineOptions()
// .add(Balvinder, latLng)
// .width(5)
// .color(Color.RED).geodesic(true));
markerOptions.title(name);
//
map.addMarker(markerOptions);
if (i == 0){
map.animateCamera(CameraUpdateFactory.newLatLng(latLng));
}
}
}
}