Map Matching
Note
This example is a part of the Mapbox Android Demo app. You can find the values for all referenced resources in the res directory. For example, see res/values/activity_strings.xml for R.string.* references used in this example. The dependencies can be found here.The examples use View binding.See setup documention if necessary.
Map Matching API pricing
Products used within the Mapbox Java SDK, including the Map Matching API, are individually billed. For pricing information, see the documentation for the Map Matching API.
activity_javaservices_map_matching
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:mapbox="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".examples.javaservices.MapMatchingActivity">
<com.mapbox.mapboxsdk.maps.MapView
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent"
mapbox:mapbox_cameraTargetLat="34.01591350351023"
mapbox:mapbox_cameraTargetLng="-118.4945560781314"
mapbox:mapbox_cameraZoom="14.5"/>
</LinearLayout>
MapMatchingActivity.java
package com.mapbox.mapboxandroiddemo.examples.javaservices;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.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("#c14a00"))),
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))
);
}
}
}
この{Type}は役に立ちましたか？