Examples

Track device location

activity_location_change_listening
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:mapbox="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.mapbox.mapboxsdk.maps.MapView
android:id="@+id/mapView"
android:layout_width="0dp"
android:layout_height="0dp"
mapbox:layout_constraintBottom_toBottomOf="parent"
mapbox:layout_constraintEnd_toEndOf="parent"
mapbox:layout_constraintStart_toStartOf="parent"
mapbox:layout_constraintTop_toTopOf="parent"
mapbox:mapbox_cameraTargetLat="36.16266"
mapbox:mapbox_cameraTargetLng="-86.78160"
mapbox:mapbox_cameraZoom="12" />
</androidx.constraintlayout.widget.ConstraintLayout>
LocationChangeListeningActivity
package com.mapbox.mapboxandroiddemo.examples.location;
import android.annotation.SuppressLint;
import android.location.Location;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
import com.mapbox.android.core.location.LocationEngine;
import com.mapbox.android.core.location.LocationEngineCallback;
import com.mapbox.android.core.location.LocationEngineProvider;
import com.mapbox.android.core.location.LocationEngineRequest;
import com.mapbox.android.core.location.LocationEngineResult;
import com.mapbox.android.core.permissions.PermissionsListener;
import com.mapbox.android.core.permissions.PermissionsManager;
import com.mapbox.mapboxandroiddemo.R;
import com.mapbox.mapboxsdk.Mapbox;
import com.mapbox.mapboxsdk.location.LocationComponent;
import com.mapbox.mapboxsdk.location.LocationComponentActivationOptions;
import com.mapbox.mapboxsdk.location.modes.CameraMode;
import com.mapbox.mapboxsdk.location.modes.RenderMode;
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 java.lang.ref.WeakReference;
import java.util.List;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
/**
* Use the Mapbox Core Library to receive updates when the device changes location.
*/
public class LocationChangeListeningActivity extends AppCompatActivity implements
OnMapReadyCallback, PermissionsListener {
private static final long DEFAULT_INTERVAL_IN_MILLISECONDS = 1000L;
private static final long DEFAULT_MAX_WAIT_TIME = DEFAULT_INTERVAL_IN_MILLISECONDS * 5;
private MapboxMap mapboxMap;
private MapView mapView;
private PermissionsManager permissionsManager;
private LocationEngine locationEngine;
private LocationChangeListeningActivityLocationCallback callback =
new LocationChangeListeningActivityLocationCallback(this);
@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_location_change_listening);
mapView = findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(this);
}
@Override
public void onMapReady(@NonNull final MapboxMap mapboxMap) {
this.mapboxMap = mapboxMap;
mapboxMap.setStyle(Style.TRAFFIC_NIGHT,
new Style.OnStyleLoaded() {
@Override public void onStyleLoaded(@NonNull Style style) {
enableLocationComponent(style);
}
});
}
/**
* Initialize the Maps SDK's LocationComponent
*/
@SuppressWarnings( {"MissingPermission"})
private void enableLocationComponent(@NonNull Style loadedMapStyle) {
// Check if permissions are enabled and if not request
if (PermissionsManager.areLocationPermissionsGranted(this)) {
// Get an instance of the component
LocationComponent locationComponent = mapboxMap.getLocationComponent();
// Set the LocationComponent activation options
LocationComponentActivationOptions locationComponentActivationOptions =
LocationComponentActivationOptions.builder(this, loadedMapStyle)
.useDefaultLocationEngine(false)
.build();
// Activate with the LocationComponentActivationOptions object
locationComponent.activateLocationComponent(locationComponentActivationOptions);
// Enable to make component visible
locationComponent.setLocationComponentEnabled(true);
// Set the component's camera mode
locationComponent.setCameraMode(CameraMode.TRACKING);
// Set the component's render mode
locationComponent.setRenderMode(RenderMode.COMPASS);
initLocationEngine();
} else {
permissionsManager = new PermissionsManager(this);
permissionsManager.requestLocationPermissions(this);
}
}
/**
* Set up the LocationEngine and the parameters for querying the device's location
*/
@SuppressLint("MissingPermission")
private void initLocationEngine() {
locationEngine = LocationEngineProvider.getBestLocationEngine(this);
LocationEngineRequest request = new LocationEngineRequest.Builder(DEFAULT_INTERVAL_IN_MILLISECONDS)
.setPriority(LocationEngineRequest.PRIORITY_HIGH_ACCURACY)
.setMaxWaitTime(DEFAULT_MAX_WAIT_TIME).build();
locationEngine.requestLocationUpdates(request, callback, getMainLooper());
locationEngine.getLastLocation(callback);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
@NonNull int[] grantResults) {
permissionsManager.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
@Override
public void onExplanationNeeded(List<String> permissionsToExplain) {
Toast.makeText(this, R.string.user_location_permission_explanation,
Toast.LENGTH_LONG).show();
}
@Override
public void onPermissionResult(boolean granted) {
if (granted) {
if (mapboxMap.getStyle() != null) {
enableLocationComponent(mapboxMap.getStyle());
}
} else {
Toast.makeText(this, R.string.user_location_permission_not_granted, Toast.LENGTH_LONG).show();
finish();
}
}
private static class LocationChangeListeningActivityLocationCallback
implements LocationEngineCallback<LocationEngineResult> {
private final WeakReference<LocationChangeListeningActivity> activityWeakReference;
LocationChangeListeningActivityLocationCallback(LocationChangeListeningActivity activity) {
this.activityWeakReference = new WeakReference<>(activity);
}
/**
* The LocationEngineCallback interface's method which fires when the device's location has changed.
*
* @param result the LocationEngineResult object which has the last known location within it.
*/
@Override
public void onSuccess(LocationEngineResult result) {
LocationChangeListeningActivity activity = activityWeakReference.get();
if (activity != null) {
Location location = result.getLastLocation();
if (location == null) {
return;
}
// Create a Toast which displays the new location's coordinates
Toast.makeText(activity, String.format(activity.getString(R.string.new_location),
String.valueOf(result.getLastLocation().getLatitude()),
String.valueOf(result.getLastLocation().getLongitude())),
Toast.LENGTH_SHORT).show();
// Pass the new location to the Maps SDK's LocationComponent
if (activity.mapboxMap != null && result.getLastLocation() != null) {
activity.mapboxMap.getLocationComponent().forceLocationUpdate(result.getLastLocation());
}
}
}
/**
* The LocationEngineCallback interface's method which fires when the device's location can't be captured
*
* @param exception the exception message
*/
@Override
public void onFailure(@NonNull Exception exception) {
Log.d("LocationChangeActivity", exception.getLocalizedMessage());
LocationChangeListeningActivity activity = activityWeakReference.get();
if (activity != null) {
Toast.makeText(activity, exception.getLocalizedMessage(),
Toast.LENGTH_SHORT).show();
}
}
}
@Override
protected void onStart() {
super.onStart();
mapView.onStart();
}
@Override
protected void onResume() {
super.onResume();
mapView.onResume();
}
@Override
protected void onPause() {
super.onPause();
mapView.onPause();
}
@Override
protected void onStop() {
super.onStop();
mapView.onStop();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mapView.onSaveInstanceState(outState);
}
@Override
protected void onDestroy() {
super.onDestroy();
// Prevent leaks
if (locationEngine != null) {
locationEngine.removeLocationUpdates(callback);
}
mapView.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mapView.onLowMemory();
}
}
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