我正在使用Google的Google Maps Directions api，并且试图在2个坐标之间插入一条折线，该怎么做？
我已经在 gradle.properties 中添加了API密钥，如下所示：
GOOGLE_MAPS_API_KEY = MY-API-KEY-HERE
我可以在代码内访问“ LatLng”等，因此一切似乎都正常。
但是我的问题是..如何在一条路线的坐标之间绘制一条折线？我已经检查了其他一些示例，但似乎都没有用。我是否必须从网上获取数据，或者是否已经设置好所有内容？
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback{
private GoogleMap mMap;
MarkerOptions place1, place2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
getAddressDirection();
}
public void getAddressDirection(){
place1 = new MarkerOptions().position(new LatLng(57.6800907, 12.0031394)).title("Loc1");
place2 = new MarkerOptions().position(new LatLng(57.9576648, 12.1188331)).title("Loc2");
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Sydney and move the camera
mMap.setMyLocationEnabled(true);
//Adding marker between two coordinates
mMap.addMarker(place1);
mMap.addMarker(place2);
}
}
答案 0 :(得分：0)
您需要在地图上添加折线和多边形。
@Override
public void onMapReady(GoogleMap googleMap) {
Polyline polyline1 = googleMap.addPolyline(new PolylineOptions()
.clickable(true)
.add(
new LatLng(-35.016, 143.321),
new LatLng(-32.491, 147.309)));
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(-23.684, 133.903), 4));
}
有关更多详细信息，请访问enter link description here
答案 1 :(得分：0)
我认为您应该尝试使用我的代码
async reloadResources() {
this.resourceName = this.$router.currentRoute.params.resourceName || this.$router.currentRoute.name;
if (this.resourceName) {
let filters_backup = _.cloneDeep(this.$store.getters[`${this.resourceName}/filters`]);
let filters_to_change = _.cloneDeep(filters_backup);
filters_to_change.push({});
await this.$store.commit(`${this.resourceName}/storeFilters`, filters_to_change);
await this.$store.commit(`${this.resourceName}/storeFilters`, filters_backup);
}
},
DownloadTask是我的如下所示的AsycTask
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Sydney and move the camera
mMap.setMyLocationEnabled(true);
//Adding marker between two coordinates
mMap.addMarker(place1);
mMap.addMarker(place2);
String url = getDirectionsUrl();
new DownloadTask().execute(url);
}
private String getDirectionsUrl()
{
String str_origin = "origin="+57.6800907+","+12.0031394;
String str_dest = "destination="+57.9576648+","+12.1188331;
String sensor = "sensor=false";
String parameters = str_origin+"&"+str_dest+"&"+sensor;
String output = "json";
String url = "https://maps.googleapis.com/maps/api/directions/"+output+"?"+parameters;
return url;
}
ParserTask是用于在Google地图上绘制路径的新异步任务
private class DownloadTask extends AsyncTask<String, Void, String> {
ProgressDialog dialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
dialog = new ProgressDialog(MapDetailActivity.this);
dialog.setMessage("Please wait...");
dialog.setCancelable(false);
dialog.show();
ISPROGRESS = true;
}
@Override
protected String doInBackground(String... url) {
String data = "";
try{
data = downloadUrl(url[0]);
}catch(Exception e){
//Log.e("XXX","Exception while downloading "+e.toString());
}
return data;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
dialog.dismiss();
new ParserTask().execute(result);
}
}
private String downloadUrl(String strUrl) throws IOException {
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try{
URL url = new URL(strUrl);
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.connect();
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.e("Exception while downloading url", e.toString());
}finally{
iStream.close();
urlConnection.disconnect();
}
return data;
}
lastone是DirectionJSONParser是readymate类
private class ParserTask extends AsyncTask<String, Integer, List<List<HashMap<String,String>>> >
{
@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();
routes = parser.parse(jObject);
}catch(Exception e){
e.printStackTrace();
}
return routes;
}
@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(getApplicationContext(), "No Points", Toast.LENGTH_SHORT).show();
return;
}
for(int i=0;i<result.size();i++){
points = new ArrayList<LatLng>();
//lineOptions = new PolylineOptions();
List<HashMap<String, String>> path = result.get(i);
for(int j=0;j<path.size();j++)
{
HashMap<String,String> point = path.get(j);
if(j==0){
distance = (String)point.get("distance");
continue;
}else if(j==1){
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(5);
lineOptions.color(Color.RED);
}
//textView_distance.setText(distance); //if you want
//textView_time.setText(duration); //if you want
mMap.addPolyline(lineOptions);
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(Latitude,Longitude),15f));
ISPROGRESS = false;
}
}
答案 2 :(得分：0)
在两个坐标之间绘制多段线需要几个步骤。
1-您需要点击此网址
strWord += whatever;2-您需要解析响应并获取所有坐标列表，并将其输入到PolyLine。
我建议您使用自己的API KEY来看看此repo。