Tracking / Follow me

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent">

    <com.trimblemaps.mapsdk.maps.MapView
        android:id="@+id/mapView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <Button
            android:visibility="invisible"
            android:onClick="onButtonRecenterClick"
            android:id="@+id/btn_recenter"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="right|center"
            android:text="Recenter" />
    </com.trimblemaps.mapsdk.maps.MapView>

</FrameLayout>

public class SampleFollowMeActivity extends AppCompatActivity implements OnMapReadyCallback, LocationEngineCallback<LocationEngineResult>, TrimbleMapsMap.OnMoveListener {

    private static final long DEFAULT_INTERVAL_IN_MILLISECONDS = 900L;
    private static final long DEFAULT_MAX_WAIT_TIME = DEFAULT_INTERVAL_IN_MILLISECONDS * 5;
    private static final int ANIMATION_TIME = 400;
    private MapView mapView;
    private TrimbleMapsMap map;
    private LocationComponent locationComponent;
    private LocationEngine locationEngine;
    private Button recenter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Authorize the api key for the session.
        // .apiKey() requires your Trimble Maps API key
        TrimbleMapsAccount trimbleMapsAccount = TrimbleMapsAccount.builder()
                .apiKey(getString(R.string.API_KEY))
                .addLicensedFeature(LicensedFeature.MAPS_SDK)
                .build();

        // Initialize the session
        TrimbleMapsAccountManager.initialize(trimbleMapsAccount);
        TrimbleMapsAccountManager.awaitInitialization();

        // Get an instance of the map, done before the layout is set.
        TrimbleMaps.getInstance(this);

        setContentView(R.layout.activity_sample_follow_me);

        // Find the recenter button
        recenter = (Button) findViewById(R.id.btn_recenter);

        // Set up the MapView from the layout
        mapView = (MapView) findViewById(R.id.mapView);

        // Implementing OnMapReadyCallback into the activity
        mapView.getMapAsync(this);

    }

    @Override
    public void onMapReady(TrimbleMapsMap trimbleMapsMap) {
        // The TrimbleMapsMap object is created, now a style can be applied to render a map.
        map = trimbleMapsMap;
        map.addOnMoveListener(this);
        map.setStyle(Style.MOBILE_DEFAULT, new Style.OnStyleLoaded() {
            @Override
            public void onStyleLoaded(@NonNull Style style) {
                // Not setting the start location here, as that will be tracked by the user's
                // location. Instead, just defining the initial zoom.
                map.setCameraPosition(new CameraPosition.Builder().zoom(15).build());
                setupLocationComponent();

            }
        });

        ;
    }

    // Before a user's location can be used, location permissions will need to
    // be given to the app. This code assumes those permissions have already been granted by this
    // point. For more information on how to grant location permissions to your app,
    // see: https://developer.android.com/training/location/permissions
    @SuppressLint("MissingPermission")
    public void setupLocationComponent() {
        // Create the location component
        locationComponent = map.getLocationComponent();
        // Set the style to attach it to, in this case the current style on the map
        locationComponent.activateLocationComponent(LocationComponentActivationOptions.builder(this, map.getStyle()).build());
        // Turn it on
        locationComponent.setLocationComponentEnabled(true);

        // Set the tracking and render modes
        // Tracking with the compass allows bearing to rotate the map as needed.
        locationComponent.setCameraMode(CameraMode.TRACKING_COMPASS);
        locationComponent.setRenderMode(RenderMode.COMPASS);

        // Set the location engine
        locationEngine = LocationEngineProvider.getBestLocationEngine(this);

        startTracking();

    }

    @SuppressLint("MissingPermission")
    public void startTracking() {
        // Create the location engine request to track any changes to a user's location.
        LocationEngineRequest locationEngineRequest = new LocationEngineRequest.Builder(DEFAULT_INTERVAL_IN_MILLISECONDS)
                .setPriority(LocationEngineRequest.PRIORITY_HIGH_ACCURACY)
                .setMaxWaitTime(DEFAULT_MAX_WAIT_TIME)
                .build();

        // Start listening for changes to location, then fire the callback with the result
        locationEngine.requestLocationUpdates(locationEngineRequest, this, getMainLooper());
        // Start with the last current location
        locationEngine.getLastLocation(this);
    }

    @Override
    public void onSuccess(LocationEngineResult result) {
        // We have a successful callback, check the location isn't null and update as needed.
        Location currentLocation = result.getLastLocation();
        if(currentLocation != null) {
            LocationUpdate locationUpdate = new LocationUpdate.Builder()
                    .location((result.getLastLocation())) // Set the location from the result
                    .animationDuration(Long.valueOf(ANIMATION_TIME))
                    .build();
            map.getLocationComponent().forceLocationUpdate(locationUpdate);
        }
    }

    @SuppressLint("MissingPermission")
    public void onButtonRecenterClick(View view) {
        // When Recenter is tapped, use the tracking mode
        locationComponent.setCameraMode(CameraMode.TRACKING_COMPASS);
        // Force an update
        locationEngine.getLastLocation(this);
        // Hide the button
        recenter.setVisibility(View.INVISIBLE);
    }

    @Override
    public void onFailure(Exception exception) {
        // The request failed
    }

    @Override
    public void onMoveBegin(MoveGestureDetector moveGestureDetector) {
        // when the user begins to move the map
        // Display the recenter button since panning has happened
        recenter.setVisibility(View.VISIBLE);
    }

    @Override
    public void onMove(MoveGestureDetector moveGestureDetector) {
        // the user is moving the map
    }

    @Override
    public void onMoveEnd(MoveGestureDetector moveGestureDetector) {
        // the user has stopped moving the map
    }
}