我是安卓新手。我想在多个标记之间绘制路线。我a，从服务器获取纬度、经度和日期时间。现在我想显示点之间的路线。我已将它们存储在数组列表中。这是我如何在异步任务 doInBackground() 中获取点。
newLatt= new ArrayList<String>();
newLongg= new ArrayList<String>();
newdatTime= new ArrayList<String>();
JSONArray arr = new JSONArray(strServerResponse);
for (int i = 0; i < arr.length(); i++) {
JSONObject jsonObj1 = arr.getJSONObject(i);
String status = jsonObj1.optString("status");
if (status!="false"){
Pojo pojo = new Pojo();
String latitude = jsonObj1.optString("Latitude");
String longitude = jsonObj1.optString("Longitude");
String date_time = jsonObj1.optString("date_time");
newLatt.add(latitude);
newLongg.add(longitude);
newdatTime.add(date_time);
}else {
Handler handler = new Handler(Looper.getMainLooper());
handler.post(new Runnable() {
@Override
public void run() {
AlertDialog alertDialog = new AlertDialog.Builder(
MapActivity.this).create();
alertDialog.setMessage("Locations Not Available");
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
}
});
alertDialog.show();
}
}
);
}
在 postExecute() 方法中我显示标记
SupportMapFragment supportMapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
map = supportMapFragment.getMap();
map.setMyLocationEnabled(true);
if (newLatt.size()>0){
for (int i = 0; i < newLatt.size(); i++) {
Double lati = Double.parseDouble(newLatt.get(i));
Double longi = Double.parseDouble(newLongg.get(i));
String dattme = newdatTime.get(i);
dest = new LatLng(lati, longi);
if (map != null) {
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(dest);
map.moveCamera(CameraUpdateFactory.newLatLng(dest));
map.animateCamera(CameraUpdateFactory.zoomTo(15));
markerOptions.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_RED));
markerOptions.title("" + dattme);
map.addMarker(markerOptions);
map.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
@Override
public boolean onMarkerClick(Marker marker) {
marker.showInfoWindow();
return false;
}
});
更新
PolylineOptions rectOptions = new PolylineOptions();
//this is the color of route
rectOptions.color(Color.argb(255, 85, 166, 27));
LatLng startLatLng = null;
LatLng endLatLng = null;
SupportMapFragment supportMapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
map = supportMapFragment.getMap();
map.setMyLocationEnabled(true);
if (newLatt.size()>0){
for (int i = 0; i < newLatt.size(); i++) {
Double lati = Double.parseDouble(newLatt.get(i));
Double longi = Double.parseDouble(newLongg.get(i));
String dattme = newdatTime.get(i);
dest = new LatLng(lati, longi);
if (map != null) {
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(dest);
map.moveCamera(CameraUpdateFactory.newLatLng(dest));
map.animateCamera(CameraUpdateFactory.zoomTo(15));
markerOptions.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_RED));
markerOptions.title("" + dattme);
map.addMarker(markerOptions);
map.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
@Override
public boolean onMarkerClick(Marker marker) {
marker.showInfoWindow();
return false;
}
});
LatLng latlng = new LatLng(lati,
longi);
if (i == 0) {
startLatLng = latlng;
}
if (i == newLatt.size() - 1) {
endLatLng = latlng;
}
rectOptions.add(latlng);
String url = getDirectionsUrl(startLatLng, endLatLng);
DownloadTask downloadTask = new DownloadTask();
downloadTask.execute(url);
}
}
map.addPolyline(rectOptions);
获取路线：
private String getDirectionsUrl(LatLng origin, LatLng dest) {
// Origin of route
String str_origin = "origin=" + origin.latitude + ","
+ origin.longitude;
// Destination of route
String str_dest = "destination=" + dest.latitude + "," + dest.longitude;
// Sensor enabled
String sensor = "sensor=false";
// Building the parameters to the web service
String parameters = str_origin + "&" + str_dest + "&" + sensor;
// Output format
String output = "json";
// Building the url to the web service
String url = "https://maps.googleapis.com/maps/api/directions/"
+ output + "?" + parameters;
return url;
}
在 postExecute 中添加以下代码以在地图上添加折线。
PolylineOptions rectOptions = new PolylineOptions();
//this is the color of route
rectOptions.color(Color.argb(255, 85, 166, 27));
LatLng startLatLng = null;
LatLng endLatLng = null;
for (int i = 0; i < newLatt.size(); i++) {
Double lati = Double.parseDouble(newLatt.get(i));
Double longi = Double.parseDouble(newLongg.get(i));
LatLng latlng = new LatLng(lati,
longi);
if (i == 0) {
startLatLng = latlng;
}
if (i == jArr.length() - 1) {
endLatLng = latlng;
}
rectOptions.add(latlng);
}
map.addPolyline(rectOptions);
快乐编码...
Android does not provide embedded direction service in google map api. To draw route between points you must use google direction services REST API .
You can get complete code and description from http://wptrafficanalyzer.in/blog/drawing-driving-route-directions-between-two-locations-using-google-directions-in-google-map-android-api-v2/
ArrayList<LatLng> points = null;
PolylineOptions lineOptions = null;
MarkerOptions markerOptions = new MarkerOptions();
// Traversing through all the routes
for(int i=0;i<result.size();i++){
points = new ArrayList<LatLng>();
lineOptions = new PolylineOptions();
// Fetching i-th route
List<HashMap<String, String>> path = result.get(i);
// Fetching all the points in i-th route
for(int j=0;j<path.size();j++){
HashMap<String,String> point = path.get(j);
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(2);
lineOptions.color(Color.RED);
}
// Drawing polyline in the Google Map for the i-th route
map.addPolyline(lineOptions);
如果有人像我一样登陆这里，事实证明您可以使用 Google 地图库，使用 PolyUtil 类方便地在地图上绘制路线。
简短版本
添加谷歌地图库 - 'com.google.maps:google-maps-services:0.1.20'
那么，
val directionResponse = apiInterface.getDirection(fromLatLng, toLatLng)
val decodedPaths = PolyUtil.decode(directionResponse.routes.overviewPolyline.points)
map?.addPolyline(PolylineOptions().addAll(decodedPaths))
长版
首先，在 build.gradle 文件中添加库
implementation 'com.google.maps:google-maps-services:0.1.20'
其次，对方向 url 端点进行 api 调用 - https://maps.googleapis.com/maps/api/directions/json?query
响应有一个属性routes->overview_polyline->points
第三，将点字段中的值从谷歌地图服务方法传递给实用程序方法，
val decodedPaths = PolyUtil.decode(points)
最后在你的地图上，像这样添加它
map?.addPolyline(PolylineOptions().addAll(decodedPaths))
这将在地图上绘制路径。希望这有帮助！