Use map matching

package com.mapbox.mapboxandroiddemo.examples.javaservices;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import com.mapbox.api.matching.v5.MapboxMapMatching;
import com.mapbox.api.matching.v5.models.MapMatchingMatching;
import com.mapbox.api.matching.v5.models.MapMatchingResponse;
import com.mapbox.core.exceptions.ServicesException;
import com.mapbox.geojson.Feature;
import com.mapbox.geojson.FeatureCollection;
import com.mapbox.geojson.LineString;
import com.mapbox.geojson.Point;
import com.mapbox.mapboxandroiddemo.R;
import com.mapbox.mapboxsdk.Mapbox;
import com.mapbox.mapboxsdk.maps.MapView;
import com.mapbox.mapboxsdk.maps.MapboxMap;
import com.mapbox.mapboxsdk.maps.OnMapReadyCallback;
import com.mapbox.mapboxsdk.maps.Style;
import com.mapbox.mapboxsdk.style.layers.LineLayer;
import com.mapbox.mapboxsdk.style.sources.GeoJsonSource;
import com.mapbox.mapboxsdk.utils.ColorUtils;
import java.io.InputStream;
import java.lang.ref.WeakReference;
import java.util.List;
import java.util.Objects;
import java.util.Scanner;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import timber.log.Timber;
import static com.mapbox.api.directions.v5.DirectionsCriteria.PROFILE_DRIVING;
import static com.mapbox.core.constants.Constants.PRECISION_6;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.lineColor;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.lineOpacity;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.lineWidth;
/**
* Match raw GPS points to the map so they align with roads and pathways.
*/
public class MapMatchingActivity extends AppCompatActivity {
private static final String TAG = "MapMatchingActivity";
private MapView mapView;
private MapboxMap map;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Mapbox access token is configured here. This needs to be called either in your application
// object or in the same activity which contains the mapview.
Mapbox.getInstance(this, getString(R.string.access_token));
// This contains the MapView in XML and needs to be called after the access token is configured.
setContentView(R.layout.activity_javaservices_map_matching);
mapView = findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(@NonNull MapboxMap mapboxMap) {
map = mapboxMap;
map.setStyle(Style.MAPBOX_STREETS, new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull Style style) {
new LoadGeoJson(MapMatchingActivity.this).execute();
}
});
}
});
}
@Override
protected void onStart() {
super.onStart();
mapView.onStart();
}
@Override
public void onResume() {
super.onResume();
mapView.onResume();
}
@Override
public void onPause() {
super.onPause();
mapView.onPause();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mapView.onLowMemory();
}
@Override
protected void onStop() {
super.onStop();
mapView.onStop();
}
@Override
protected void onDestroy() {
super.onDestroy();
mapView.onDestroy();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mapView.onSaveInstanceState(outState);
}
private static class LoadGeoJson extends AsyncTask<Void, Void, FeatureCollection> {
private WeakReference<MapMatchingActivity> weakReference;
LoadGeoJson(MapMatchingActivity activity) {
this.weakReference = new WeakReference<>(activity);
}
@Override
protected FeatureCollection doInBackground(Void... voids) {
try {
MapMatchingActivity activity = weakReference.get();
if (activity != null) {
InputStream inputStream = activity.getAssets().open("trace.geojson");
return FeatureCollection.fromJson(convertStreamToString(inputStream));
}
} catch (Exception exception) {
Timber.e("Exception Loading GeoJSON: %s", exception.toString());
}
return null;
}
static String convertStreamToString(InputStream is) {
Scanner scanner = new Scanner(is).useDelimiter("\\A");
return scanner.hasNext() ? scanner.next() : "";
}
@Override
protected void onPostExecute(@Nullable FeatureCollection featureCollection) {
super.onPostExecute(featureCollection);
MapMatchingActivity activity = weakReference.get();
if (activity != null && featureCollection != null) {
activity.drawLines(featureCollection);
}
}
}
private void drawLines(@NonNull FeatureCollection featureCollection) {
List<Feature> features = featureCollection.features();
if (features != null && features.size() > 0) {
Feature feature = features.get(0);
drawBeforeMapMatching(feature);
requestMapMatched(feature);
}
}
private void drawBeforeMapMatching(Feature feature) {
map.getStyle(style -> {
style.addSource(new GeoJsonSource("pre-matched-source-id", feature));
style.addLayer(new LineLayer("pre-matched-layer-id", "pre-matched-source-id").withProperties(
lineColor(ColorUtils.colorToRgbaString(Color.parseColor("#3bb2d0"))),
lineWidth(6f),
lineOpacity(1f)
));
});
}
private void requestMapMatched(Feature feature) {
List<Point> points = ((LineString) Objects.requireNonNull(feature.geometry())).coordinates();
try {
// Setup the request using a client.
MapboxMapMatching client = MapboxMapMatching.builder()
.accessToken(Objects.requireNonNull(Mapbox.getAccessToken()))
.profile(PROFILE_DRIVING)
.coordinates(points)
.build();
// Execute the API call and handle the response.
client.enqueueCall(new Callback<MapMatchingResponse>() {
@Override
public void onResponse(@NonNull Call<MapMatchingResponse> call,
@NonNull Response<MapMatchingResponse> response) {
if (response.code() == 200) {
drawMapMatched(Objects.requireNonNull(response.body()).matchings());
} else {
// If the response code does not response "OK" an error has occurred.
Timber.e("MapboxMapMatching failed with %s", response.code());
}
}
@Override
public void onFailure(Call<MapMatchingResponse> call, Throwable throwable) {
Timber.e(throwable, "MapboxMapMatching error");
}
});
} catch (ServicesException servicesException) {
Timber.e(servicesException, "MapboxMapMatching error");
}
}
private void drawMapMatched(@NonNull List<MapMatchingMatching> matchings) {
Style style = map.getStyle();
if (style != null && !matchings.isEmpty()) {
style.addSource(new GeoJsonSource("matched-source-id", Feature.fromGeometry(LineString.fromPolyline(
Objects.requireNonNull(matchings.get(0).geometry()), PRECISION_6)))
);
style.addLayer(new LineLayer("matched-layer-id", "matched-source-id")
.withProperties(
lineColor(ColorUtils.colorToRgbaString(Color.parseColor("#3bb2d0"))),
lineWidth(6f))
);
}
}
}