问题
Okay so I am fairly new to Mapbox, I have used GMaps prior to this but I found that Mapbox is more capable of doing what I need, the problem is I have hit a bit of a wall.
I have used a combination of the examples available on their site e.g.
https://www.mapbox.com/android-sdk/examples/geocoding and https://www.mapbox.com/android-sdk/examples/directions
I am trying to allow the user to search a destination and then have it turned into coordinates which will be used to plot in the map. I then want to draw a route from their current location to their destination, this is where my problem comes in.
mapView.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(MapboxMap mapboxMap) {
map = mapboxMap;
// Set the origin waypoint to the devices location
Position origin = Position.fromCoordinates(mapboxMap.getMyLocation().getLongitude(), mapboxMap.getMyLocation().getLatitude());
// Set the destination waypoint to the location point long clicked by the user
final Position destination = updateMap(feature.getLongitude(), feature.getLatitude());
mapboxMap.addMarker(new MarkerOptions()
.position(new LatLng(origin.getLatitude(), origin.getLongitude()))
.title("Origin")
.snippet("Alhambra"));
mapboxMap.addMarker(new MarkerOptions()
.position(new LatLng(latitude, destination.getLongitude()))
.title("Destination")
.snippet("Plaza del Triunfo"));
// Get route from API
try {
getRoute(origin, destination);
} catch (ServicesException e) {
e.printStackTrace();
}
}
});
AndroidGeocoder geocoder = new AndroidGeocoder(context, Locale.getDefault());
geocoder.setAccessToken(MAPBOX_ACCESS_TOKEN);
addresses = geocoder.getFromLocation(
location.getLatitude(),
location.getLongitude(),
1);
// Set up autocomplete widget
GeocoderAutoCompleteView autocomplete = (GeocoderAutoCompleteView) findViewById(R.id.query);
autocomplete.setAccessToken("pk.eyJ1IjoiYmV1dHJveCIsImEiOiJjaW5ybzlwYnQwMGlqdnhtMno3cmtwNTlqIn0.y16mZzmertL4-eEfQNGeqQ");
autocomplete.setType(GeocodingCriteria.TYPE_POI);
autocomplete.setOnFeatureListener(new GeocoderAutoCompleteView.OnFeatureListener() {
@Override
public void OnFeatureClick(GeocodingFeature feature) {
Position position = feature.asPosition();
updateMap(position.getLatitude(), position.getLongitude());
}
});
}
private void getRoute(Position origin, Position destination) throws ServicesException {
MapboxDirections client = new MapboxDirections.Builder()
.setOrigin(origin)
.setDestination(destination)
.setProfile(DirectionsCriteria.PROFILE_CYCLING)
.setAccessToken("pk.eyJ1IjoiYmV1dHJveCIsImEiOiJjaW5ybzlwYnQwMGlqdnhtMno3cmtwNTlqIn0.y16mZzmertL4-eEfQNGeqQ")
.build();
client.enqueueCall(new Callback<DirectionsResponse>() {
@Override
public void onResponse(Call<DirectionsResponse> call, Response<DirectionsResponse> response) {
// You can get the generic HTTP info about the response
Log.d(TAG, "Response code: " + response.code());
if (response.body() == null) {
Log.e(TAG, "No routes found, make sure you set the right user and access token.");
return;
}
// Display some info about the route
currentRoute = response.body().getRoutes().get(0);
Log.d(TAG, "Distance: " + currentRoute.getDistance());
Toast.makeText(MainActivity.this, "Route is " + currentRoute.getDistance() + " meters long.", Toast.LENGTH_SHORT).show();
// Draw the route on the map
drawRoute(currentRoute);
}
@Override
public void onFailure(Call<DirectionsResponse> call, Throwable t) {
Log.e(TAG, "Error: " + t.getMessage());
Toast.makeText(MainActivity.this, "Error: " + t.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
private void drawRoute(DirectionsRoute route) {
// Convert LineString coordinates into LatLng[]
LineString lineString = LineString.fromPolyline(route.getGeometry(), Constants.OSRM_PRECISION_V5);
List<Position> coordinates = lineString.getCoordinates();
LatLng[] points = new LatLng[coordinates.size()];
for (int i = 0; i < coordinates.size(); i++) {
points[i] = new LatLng(
coordinates.get(i).getLatitude(),
coordinates.get(i).getLongitude());
}
// Draw Points on MapView
map.addPolyline(new PolylineOptions()
.add(points)
.color(Color.parseColor("#009688"))
.width(5));
}
private void myLocation() {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
mapView.setMyLocationEnabled(true);
mapView.setMyLocationTrackingMode(MyLocationTracking.TRACKING_FOLLOW);
mapView.getMyLocation();
}
So somewhere in here is my problem, I can't find much about Mapbox online since their new sdk is very different to the previous versions, mainly because MapView and MapboxMap are now seperated (this still confuses me).
Any help would be greatly appreciated :D
:Edit: I'm struggling mainly with setting a destination, and because of this a lot of my current variables are mixed up. If you need explaining, I will happily.
回答1:
A few mistakes in your code, biggest being you are still using MapView to get location information when you can use MapboxMap instead. Heres some rough code that will do what you ask for. It doesn't check for user permission like you should but it will show you how to do the Mapbox stuff.
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
import com.mapbox.mapboxsdk.annotations.MarkerOptions;
import com.mapbox.mapboxsdk.annotations.PolylineOptions;
import com.mapbox.mapboxsdk.geometry.LatLng;
import com.mapbox.mapboxsdk.maps.MapView;
import com.mapbox.mapboxsdk.maps.MapboxMap;
import com.mapbox.mapboxsdk.maps.OnMapReadyCallback;
import com.mapbox.services.Constants;
import com.mapbox.services.android.geocoder.ui.GeocoderAutoCompleteView;
import com.mapbox.services.commons.ServicesException;
import com.mapbox.services.commons.geojson.LineString;
import com.mapbox.services.commons.models.Position;
import com.mapbox.services.directions.v5.DirectionsCriteria;
import com.mapbox.services.directions.v5.MapboxDirections;
import com.mapbox.services.directions.v5.models.DirectionsResponse;
import com.mapbox.services.directions.v5.models.DirectionsRoute;
import com.mapbox.services.geocoding.v5.GeocodingCriteria;
import com.mapbox.services.geocoding.v5.models.GeocodingFeature;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class MainActivity extends Activity {
private final static String TAG = "MainActivity";
private MapView mapView;
private MapboxMap map;
private DirectionsRoute currentRoute;
private Position origin;
private Position destination;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Setup the MapView
mapView = (MapView) findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(MapboxMap mapboxMap) {
map = mapboxMap;
mapboxMap.setMyLocationEnabled(true);
// Set up autocomplete widget
GeocoderAutoCompleteView autocomplete = (GeocoderAutoCompleteView) findViewById(R.id.query);
autocomplete.setAccessToken("<your access token>");
autocomplete.setType(GeocodingCriteria.TYPE_POI);
autocomplete.setOnFeatureListener(new GeocoderAutoCompleteView.OnFeatureListener() {
@Override
public void OnFeatureClick(GeocodingFeature feature) {
if(map.getMyLocation() != null) {
// Set the origin as user location only if we can get their location
origin = Position.fromCoordinates(map.getMyLocation().getLongitude(), map.getMyLocation().getLatitude());
}else{
return;
}
destination = feature.asPosition();
// Add origin and destination to the map
map.addMarker(new MarkerOptions()
.position(new LatLng(origin.getLatitude(), origin.getLongitude())));
map.addMarker(new MarkerOptions()
.position(new LatLng(destination.getLatitude(), destination.getLongitude())));
// Get route from API
try {
getRoute(origin, destination);
} catch (ServicesException e) {
e.printStackTrace();
}
}
});
}
});
}
private void getRoute(Position origin, Position destination) throws ServicesException {
MapboxDirections client = new MapboxDirections.Builder()
.setOrigin(origin)
.setDestination(destination)
.setProfile(DirectionsCriteria.PROFILE_CYCLING)
.setAccessToken("<your access token>")
.build();
client.enqueueCall(new Callback<DirectionsResponse>() {
@Override
public void onResponse(Call<DirectionsResponse> call, Response<DirectionsResponse> response) {
// You can get the generic HTTP info about the response
Log.d(TAG, "Response code: " + response.code());
if (response.body() == null) {
Log.e(TAG, "No routes found, make sure you set the right user and access token.");
return;
}
// Print some info about the route
currentRoute = response.body().getRoutes().get(0);
Log.d(TAG, "Distance: " + currentRoute.getDistance());
Toast.makeText(MainActivity.this, "Route is " + currentRoute.getDistance() + " meters long.", Toast.LENGTH_SHORT).show();
// Draw the route on the map
drawRoute(currentRoute);
}
@Override
public void onFailure(Call<DirectionsResponse> call, Throwable t) {
Log.e(TAG, "Error: " + t.getMessage());
Toast.makeText(MainActivity.this, "Error: " + t.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
private void drawRoute(DirectionsRoute route) {
// Convert LineString coordinates into LatLng[]
LineString lineString = LineString.fromPolyline(route.getGeometry(), Constants.OSRM_PRECISION_V5);
List<Position> coordinates = lineString.getCoordinates();
LatLng[] points = new LatLng[coordinates.size()];
for (int i = 0; i < coordinates.size(); i++) {
points[i] = new LatLng(
coordinates.get(i).getLatitude(),
coordinates.get(i).getLongitude());
}
// Draw Points on MapView
map.addPolyline(new PolylineOptions()
.add(points)
.color(Color.parseColor("#009688"))
.width(5));
}
@Override
public void onResume() {
super.onResume();
mapView.onResume();
}
@Override
public void onPause() {
super.onPause();
mapView.onPause();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mapView.onSaveInstanceState(outState);
}
@Override
protected void onDestroy() {
super.onDestroy();
mapView.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mapView.onLowMemory();
}
Hope this helps!
来源：https://stackoverflow.com/questions/37149805/mapbox-android-how-to-get-directions-from-current-location-to-a-destination-you