如何绘制从一个标记到另一个标记的路线方向？谷歌地图 v2 Android
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How to draw route directions from a marker to another one ? Googlemaps v2 Android
提问by KingMaker
Here is my code :
这是我的代码：
public class MyGoogleMapActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.googlemap);
GoogleMap map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
map.setMyLocationEnabled(true);
LatLng Paris= new LatLng(64.711696, 12.170481);
map.addMarker(new MarkerOptions().title("LolluSaba").position(Paris));
LatLng Cinema= new LatLng(34.711696, 2.170481);
map.addMarker(new MarkerOptions().title("Pseudo").position(Cinema));
}
}
And i like to draw a route from Paris to Cinema. How can I do it very simply ?
我喜欢画一条从巴黎到电影院的路线。我怎样才能非常简单地做到这一点？
采纳答案by Shadow
As you have two points so send it through google json which provides to draw route between two points. See this example.
由于您有两个点，因此请通过 google json 发送它，该 json 提供在两点之间绘制路线。请参阅此示例。
回答by Giacomoni
Assuming that you have the coordinates of the two points you want to draw, you can get the route from google using the following methods:
假设你有你要绘制的两个点的坐标，你可以使用以下方法从google获取路线：
class GetDirection extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
dialog = new ProgressDialog(MapaAnunciante.this);
dialog.setMessage("Drawing the route, please wait!");
dialog.setIndeterminate(false);
dialog.setCancelable(false);
dialog.show();
}
protected String doInBackground(String... args) {
String stringUrl = "http://maps.googleapis.com/maps/api/directions/json?origin=" + origin+ "&destination=" + destination+ "&sensor=false";
StringBuilder response = new StringBuilder();
try {
URL url = new URL(stringUrl);
HttpURLConnection httpconn = (HttpURLConnection) url
.openConnection();
if (httpconn.getResponseCode() == HttpURLConnection.HTTP_OK) {
BufferedReader input = new BufferedReader(
new InputStreamReader(httpconn.getInputStream()),
8192);
String strLine = null;
while ((strLine = input.readLine()) != null) {
response.append(strLine);
}
input.close();
}
String jsonOutput = response.toString();
JSONObject jsonObject = new JSONObject(jsonOutput);
// routesArray contains ALL routes
JSONArray routesArray = jsonObject.getJSONArray("routes");
// Grab the first route
JSONObject route = routesArray.getJSONObject(0);
JSONObject poly = route.getJSONObject("overview_polyline");
String polyline = poly.getString("points");
pontos = decodePoly(polyline);
} catch (Exception e) {
}
return null;
}
protected void onPostExecute(String file_url) {
for (int i = 0; i < pontos.size() - 1; i++) {
LatLng src = pontos.get(i);
LatLng dest = pontos.get(i + 1);
try{
//here is where it will draw the polyline in your map
Polyline line = map.addPolyline(new PolylineOptions()
.add(new LatLng(src.latitude, src.longitude),
new LatLng(dest.latitude, dest.longitude))
.width(2).color(Color.RED).geodesic(true));
}catch(NullPointerException e){
Log.e("Error", "NullPointerException onPostExecute: " + e.toString());
}catch (Exception e2) {
Log.e("Error", "Exception onPostExecute: " + e2.toString());
}
}
dialog.dismiss();
}
}
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;
}
Where originand destinationare two strings containing the lat and lng of the points, formatted like "-1.0,2.0":
其中origin和destination是包含点的纬度和经度的两个字符串，格式为“-1.0,2.0”：
String origin = "64.711696,12.170481";
String destination = "34.711696,2.170481";
To execute it, just call new GetDirection().execute();
要执行它，只需调用 new GetDirection().execute();
Hope it helps!
希望能帮助到你！
回答by Parampal Pooni
You Need to use the Directions API in combination with the Android Maps util Lib
您需要结合使用 Directions API Android Maps util Lib
- Get the
Encoded PolylineString from the Directions Api. - Decode the encoded string using Maps Util Lib into a list of lat/lng's (https://developers.google.com/maps/documentation/android/utility/#poly-encoding)
- Draw the Polyline on the map using the lat/lngs!
Encoded Polyline从 Directions Api获取字符串。- 使用 Maps Util Lib 将编码的字符串解码为 lat/lng 列表（https://developers.google.com/maps/documentation/android/utility/#poly-encoding）
- 使用纬度/经度在地图上绘制折线！
回答by H.Fa8
First a List of LatLng you need
首先是您需要的 LatLng 列表
List<LatLng> ls_pos=new ArrayList<>();
List<LatLng> ls_pos=new ArrayList<>();
After that In OnMapReady
之后在 OnMapReady
mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
@Override
public boolean onMarkerClick(final Marker marker) {
if (ls_pos.size() >= 2) {
mMap.addPolyline(newPolylineOptions().addAll(ls_pos).width(10).color(Color.RED).visible(true).clickable(true));
ls_pos.clear
That's Work for me.
那是为我工作。
