Memproses peristiwa navigasi

Aplikasi Anda dapat memproses peristiwa yang terjadi saat pengguna bernavigasi di sepanjang rute.

Ringkasan

Gunakan antarmuka berikut untuk memproses peristiwa navigasi:

• Navigator.ArrivalListener menyediakan callback onArrival(), yang dipicu saat perangkat tiba di tujuan.
• RoadSnappedLocationProvider.LocationListener menyediakan callback onLocationChanged(), yang dipicu saat lokasi perangkat berubah.
• Navigator.RemainingTimeOrDistanceChangedListener menyediakan callback onRemainingTimeOrDistanceChanged(), yang dipicu saat waktu atau jarak ke tujuan berikutnya berubah lebih dari jumlah yang diberikan.
• Navigator.RouteChangedListener menyediakan callback onRouteChanged(), yang dipicu saat rute berubah.

Melihat kode

< > Tampilkan/Sembunyikan kode Java untuk aktivitas navigasi.

package com.example.navsdkmultidestination;

import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.Toast;
import androidx.annotation.NonNull;
import com.google.android.libraries.navigation.ArrivalEvent;
import com.google.android.libraries.navigation.Camera;
import com.google.android.libraries.navigation.ListenableResultFuture;
import com.google.android.libraries.navigation.LocationEvent;
import com.google.android.libraries.navigation.NavigationApi;
import com.google.android.libraries.navigation.Navigator;
import com.google.android.libraries.navigation.RoadSnappedLocationProvider;
import com.google.android.libraries.navigation.SimulationOptions;
import com.google.android.libraries.navigation.SupportNavigationFragment;
import com.google.android.libraries.navigation.TimeAndDistance;
import com.google.android.libraries.navigation.Waypoint;
import java.util.ArrayList;
import java.util.List;

/**
 * An activity that displays a map and a navigation UI, guiding the user
 * from their current location to multiple destinations, also known as waypoints.
 */
public class NavigationActivityMultiDestination extends AppCompatActivity {

    private static final String TAG = NavigationActivityMultiDestination.class.getSimpleName();
    private static final String DISPLAY_BOTH = "both";
    private static final String DISPLAY_TOAST = "toast";
    private static final String DISPLAY_LOG = "log";

    private Navigator mNavigator;
    private RoadSnappedLocationProvider mRoadSnappedLocationProvider;
    private SupportNavigationFragment mNavFragment;
    private final List<Waypoint> mWaypoints = new ArrayList<>();

    private Navigator.ArrivalListener mArrivalListener;
    private Navigator.RouteChangedListener mRouteChangedListener;
    private Navigator.RemainingTimeOrDistanceChangedListener
        mRemainingTimeOrDistanceChangedListener;
    private RoadSnappedLocationProvider.LocationListener mLocationListener;

    private Bundle mSavedInstanceState;
    private static final String KEY_JOURNEY_IN_PROGRESS = "journey_in_progress";
    private boolean mJourneyInProgress = false;

    // Set fields for requesting location permission.
    private static final int PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 1;
    private boolean mLocationPermissionGranted;

    /**
     * Sets up the navigator when the activity is created.
     * @param savedInstanceState The activity state bundle.
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Save the navigator state, used to determine whether a journey is in progress.
        mSavedInstanceState = savedInstanceState;
        if (mSavedInstanceState != null
                && mSavedInstanceState.containsKey(KEY_JOURNEY_IN_PROGRESS)) {
            mJourneyInProgress = (mSavedInstanceState.getInt(KEY_JOURNEY_IN_PROGRESS) != 0);
        }

        setContentView(R.layout.activity_main);

        // Initialize the Navigation SDK.
        initializeNavigationSdk();
    }

    /**
     * Releases navigation listeners when the activity is destroyed.
     */
    @Override
    protected void onDestroy() {
        super.onDestroy();

        if ((mJourneyInProgress) && (this.isFinishing())) {
            mNavigator.removeArrivalListener(mArrivalListener);
            mNavigator.removeRouteChangedListener(mRouteChangedListener);
            mNavigator.removeRemainingTimeOrDistanceChangedListener(
                mRemainingTimeOrDistanceChangedListener);
            if (mRoadSnappedLocationProvider != null) {
                mRoadSnappedLocationProvider.removeLocationListener(mLocationListener);
            }
            displayMessage("OnDestroy: Released navigation listeners.", DISPLAY_LOG);
        }
    }

    /**
     * Saves the state of the app when the activity is paused.
     */
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        if (mJourneyInProgress) {
            outState.putInt(KEY_JOURNEY_IN_PROGRESS, 1);
        } else {
            outState.putInt(KEY_JOURNEY_IN_PROGRESS, 0);
        }
    }

    /**
     * Starts the Navigation SDK and sets the camera to follow the device's location.
     * Calls the navigateToPlaces() method when the navigator is ready.
     */
    private void initializeNavigationSdk() {
        /*
         * Request location permission, so that we can get the location of the
         * device. The result of the permission request is handled by a callback,
         * onRequestPermissionsResult.
         */
        if (ContextCompat.checkSelfPermission(this.getApplicationContext(),
                android.Manifest.permission.ACCESS_FINE_LOCATION)
                    == PackageManager.PERMISSION_GRANTED) {
            mLocationPermissionGranted = true;
        } else {
            ActivityCompat.requestPermissions(this,
                    new String[] { android.Manifest.permission.ACCESS_FINE_LOCATION },
                    PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
        }

        if (!mLocationPermissionGranted) {
            displayMessage("Error loading Navigation SDK: "
                    + "The user has not granted location permission.", DISPLAY_BOTH);
            return;
        }

        // Get a navigator.
        NavigationApi.getNavigator(this, new NavigationApi.NavigatorListener() {
                    /**
                     * Sets up the navigation UI when the navigator is ready for use.
                     */
                    @Override
                    public void onNavigatorReady(Navigator navigator) {
                        displayMessage("Navigator ready.", DISPLAY_BOTH);
                        mNavigator = navigator;
                        mNavFragment = (SupportNavigationFragment) getFragmentManager()
                                .findFragmentById(R.id.navigation_fragment);

                        // Set the camera to follow the device location with 'TILTED' driving view.
                        mNavFragment.getCamera().followMyLocation(Camera.Perspective.TILTED);

                        // Navigate to the specified places.
                        navigateToPlaces();
                    }

                    /**
                     * Handles errors from the Navigation SDK.
                     * @param errorCode The error code returned by the navigator.
                     */
                    @Override
                    public void onError(@NavigationApi.ErrorCode int errorCode) {
                        switch (errorCode) {
                            case NavigationApi.ErrorCode.NOT_AUTHORIZED:
                                displayMessage("Error loading Navigation SDK: Your API key is "
                                        + "invalid or not authorized to use the Navigation SDK.",
                                        DISPLAY_BOTH);
                                break;
                            case NavigationApi.ErrorCode.TERMS_NOT_ACCEPTED:
                                displayMessage("Error loading Navigation SDK: User did not accept "
                                        + "the Navigation Terms of Use.", DISPLAY_BOTH);
                                break;
                            case NavigationApi.ErrorCode.NETWORK_ERROR:
                                displayMessage("Error loading Navigation SDK: Network error.",
                                        DISPLAY_BOTH);
                                break;
                            case NavigationApi.ErrorCode.LOCATION_PERMISSION_MISSING:
                                displayMessage("Error loading Navigation SDK: Location permission "
                                        + "is missing.", DISPLAY_BOTH);
                                break;
                            default:
                                displayMessage("Error loading Navigation SDK: " + errorCode,
                                        DISPLAY_BOTH);
                        }
                    }
                });
    }

    /**
     * Requests directions from the user's current location to a list of waypoints.
     */
    private void navigateToPlaces() {

        // Set up a waypoint for each place that we want to go to.
        createWaypoint("ChIJq6qq6jauEmsRJAf7FjrKnXI", "Sydney Star");
        createWaypoint("ChIJ3S-JXmauEmsRUcIaWtf4MzE", "Sydney Opera House");
        createWaypoint("ChIJLwgLFGmuEmsRzpDhHQuyyoU", "Sydney Conservatorium of Music");

        // If this journey is already in progress, no need to restart navigation.
        // This can happen when the user rotates the device, or sends the app to the background.
        if (mSavedInstanceState != null
                && mSavedInstanceState.containsKey(KEY_JOURNEY_IN_PROGRESS)
                && mSavedInstanceState.getInt(KEY_JOURNEY_IN_PROGRESS) == 1) {
            return;
        }

        // Create a future to await the result of the asynchronous navigator task.
        ListenableResultFuture<Navigator.RouteStatus> pendingRoute =
                mNavigator.setDestinations(mWaypoints);

        // Define the action to perform when the SDK has determined the route.
        pendingRoute.setOnResultListener(
                new ListenableResultFuture.OnResultListener<Navigator.RouteStatus>() {
                    @Override
                    public void onResult(Navigator.RouteStatus code) {
                        switch (code) {
                            case OK:
                                mJourneyInProgress = true;
                                // Hide the toolbar to maximize the navigation UI.
                                if (getActionBar() != null) {
                                    getActionBar().hide();
                                }

                                // Register some listeners for navigation events.
                                registerNavigationListeners();

                                // Display the time and distance to each waypoint.
                                displayTimesAndDistances();

                                // Enable voice audio guidance (through the device speaker).
                                mNavigator.setAudioGuidance(
                                        Navigator.AudioGuidance.VOICE_ALERTS_AND_GUIDANCE);

                                // Simulate vehicle progress along the route for demo/debug builds.
                                if (BuildConfig.DEBUG) {
                                    mNavigator.getSimulator().simulateLocationsAlongExistingRoute(
                                            new SimulationOptions().speedMultiplier(5));
                                }

                                // Start turn-by-turn guidance along the current route.
                                mNavigator.startGuidance();
                                break;
                            // Handle error conditions returned by the navigator.
                            case NO_ROUTE_FOUND:
                                displayMessage("Error starting navigation: No route found.",
                                        DISPLAY_BOTH);
                                break;
                            case NETWORK_ERROR:
                                displayMessage("Error starting navigation: Network error.",
                                        DISPLAY_BOTH);
                                break;
                            case ROUTE_CANCELED:
                                displayMessage("Error starting navigation: Route canceled.",
                                        DISPLAY_BOTH);
                                break;
                            default:
                                displayMessage("Error starting navigation: "
                                        + String.valueOf(code), DISPLAY_BOTH);
                        }
                    }
                });
    }

    /**
     * Creates a waypoint from a given place ID and title.
     * @param placeId The ID of the place to be converted to a waypoint.
     * @param title A descriptive title for the waypoint.
     */
    private void createWaypoint(String placeId, String title) {
        try {
                mWaypoints.add(
                  Waypoint.builder()
                         .setPlaceIdString(placeId)
                         .setTitle(title)
                         .build()
                );
        } catch (Waypoint.UnsupportedPlaceIdException e) {
            displayMessage("Error starting navigation: Place ID is not supported: " + placeId,
                    DISPLAY_BOTH);
        }
    }

    /**
     * Displays the calculated travel time and distance to each waypoint.
     */
    private void displayTimesAndDistances() {
        List<TimeAndDistance> timesAndDistances = mNavigator.getTimeAndDistanceList();
        int leg = 1;
        String message = "You're on your way!";
        for (TimeAndDistance timeAndDistance : timesAndDistances) {
            message = message + "\nRoute leg: " + leg++
                    + ": Travel time (seconds): " + timeAndDistance.getSeconds()
                    + ". Distance (meters): " + timeAndDistance.getMeters();
        }
        displayMessage(message, DISPLAY_BOTH);
    }

    /**
     * Registers some event listeners to show a message and take other necessary steps
     * when specific navigation events occur.
     */
    private void registerNavigationListeners() {
        mArrivalListener = new Navigator.ArrivalListener() {
            @Override
            public void onArrival(ArrivalEvent arrivalEvent) {
                displayMessage("onArrival: You've arrived at a waypoint: "
                        + mNavigator.getCurrentRouteSegment().getDestinationWaypoint().getTitle(),
                        DISPLAY_BOTH);
                // Start turn-by-turn guidance for the next leg of the route.
                if (arrivalEvent.isFinalDestination()) {
                    displayMessage("onArrival: You've arrived at the final destination.",
                            DISPLAY_BOTH);
                } else {
                    mNavigator.continueToNextDestination();
                    mNavigator.startGuidance();
                }
            }
        };
        // Listens for arrival at a waypoint.
        mNavigator.addArrivalListener(mArrivalListener);

        mRouteChangedListener = new Navigator.RouteChangedListener() {
            @Override
            public void onRouteChanged() {
                displayMessage("onRouteChanged: The driver's route has changed. Current waypoint: "
                        + mNavigator.getCurrentRouteSegment().getDestinationWaypoint().getTitle(),
                        DISPLAY_LOG);
            }
        };
        // Listens for changes in the route.
        mNavigator.addRouteChangedListener(mRouteChangedListener);

        // Listens for road-snapped location updates.
        mRoadSnappedLocationProvider =
                NavigationApi.getRoadSnappedLocationProvider(getApplication());
        mLocationListener =
            new RoadSnappedLocationProvider.LocationListener() {
                        @Override
                        public void onLocationChanged(LocationEvent locationEvent) {
                            displayMessage("onLocationUpdated: Navigation engine has provided a new"
                                            + " road-snapped location: "
                                            + locationEvent.getLocation().toString(),
                                    DISPLAY_LOG);
                        }
                    };
        if (mRoadSnappedLocationProvider != null) {
            mRoadSnappedLocationProvider.addLocationListener(mLocationListener);
        } else {
            displayMessage("ERROR: Failed to get a location provider", DISPLAY_LOG);
        }

        mRemainingTimeOrDistanceChangedListener =
            new Navigator.RemainingTimeOrDistanceChangedListener() {
                    @Override
                    public void onRemainingTimeOrDistanceChanged() {
                        displayMessage("onRemainingTimeOrDistanceChanged: Time or distance estimate"
                                + " has changed.",
                                DISPLAY_LOG);
                    }
                };
        // Listens for changes in time or distance.
        mNavigator.addRemainingTimeOrDistanceChangedListener(60, 100,
                mRemainingTimeOrDistanceChangedListener);
    }

    /**
     * Handles the result of the request for location permissions.
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[],
                                           @NonNull int[] grantResults) {
        mLocationPermissionGranted = false;
        switch (requestCode) {
            case PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION: {
                // If request is canceled, the result arrays are empty.
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    mLocationPermissionGranted = true;
                }
            }
        }
    }

    /**
     * Shows a message on screen and in the log. Used when something goes wrong.
     * @param errorMessage The message to display.
     */
    private void displayMessage(String errorMessage, String displayMedium) {
        if (displayMedium.equals(DISPLAY_BOTH) || displayMedium.equals(DISPLAY_TOAST)) {
            Toast.makeText(this, errorMessage, Toast.LENGTH_LONG).show();
        }

        if (displayMedium.equals(DISPLAY_BOTH) || displayMedium.equals(DISPLAY_LOG)) {
            Log.d(TAG, errorMessage);
        }
    }
}

Mendeteksi kedatangan di tujuan

Di sini, tujuan mengacu pada tujuan akhir atau titik jalan. Untuk mendeteksi kedatangan, panggil Navigator.addArrivalListener(), yang mendaftarkan callback saat perangkat mencapai tujuan.

Setelah tiba, Navigation SDK untuk Android akan mengaktifkan callback onArrival() dan menghentikan panduan belokan demi belokan. Anda harus secara eksplisit memanggil Navigator.continueToNextDestination() untuk melanjutkan ke titik jalan berikutnya, dan Navigator.startGuidance() untuk melanjutkan navigasi belokan demi belokan.

Saat Anda memanggil continueToNextDestination(), navigator akan menghapus semua informasi tentang tujuan sebelumnya. Jika ingin menganalisis informasi tentang segmen rute sebelumnya, Anda harus mengambil informasi dari navigator sebelum memanggil continueToNextDestination().

Untuk menghindari kebocoran memori, Anda harus memanggil removeArrivalListener(listener) saat tidak lagi memerlukan pemroses.

mNavigator.addArrivalListener(new Navigator.ArrivalListener() {
    @Override
    public void onArrival(ArrivalEvent arrivalEvent) {
        displayMessage("onArrival: You've arrived at a waypoint: "
                + mNavigator.getCurrentRouteSegment().getDestinationWaypoint().getTitle(),
                DISPLAY_BOTH);
        // Start turn-by-turn guidance for the next leg of the route.
        if (arrivalEvent.isFinalDestination()) {
            displayMessage("onArrival: You've arrived at the final destination.",
                    DISPLAY_BOTH);
        } else {
            mNavigator.continueToNextDestination();
            mNavigator.startGuidance();
        }
    }
});

Menerima pembaruan lokasi

Dapatkan RoadSnappedLocationProvider dari NavigationApi, lalu panggil RoadSnappedLocationProvider.addLocationListener() untuk mendaftarkan callback saat lokasi atau arah perangkat berubah. Perlu diperhatikan bahwa lokasi ini dipaskan ke jalan, sehingga mungkin berbeda dengan lokasi yang ditampilkan oleh penyedia lokasi gabungan di Location API layanan Google Play.

Navigation SDK menyediakan pembaruan lokasi sesering mungkin. Saat pembaruan lokasi tersedia, Navigation SDK akan mengaktifkan callback onLocationChanged().

Pembaruan lokasi yang diambil pada jalan tidak bergantung pada navigasi, dan dapat melanjutkan bahkan setelah navigasi dihentikan. Berlangganan update lokasi dapat menyebabkan baterai cepat habis, kebocoran memori, atau pengumpulan data lokasi perangkat secara tidak sengaja jika Anda membiarkan update lokasi berjalan di latar belakang. Panggil RoadSnappedLocationProvider.removeLocationListener saat Anda tidak lagi memerlukan pemroses.

mRoadSnappedLocationProvider =
        NavigationApi.getRoadSnappedLocationProvider(getApplication());
if (mRoadSnappedLocationProvider != null) {
    mRoadSnappedLocationProvider.addLocationListener(
            new RoadSnappedLocationProvider.LocationListener() {
                @Override
                public void onLocationChanged(Location location) {
                    displayMessage("onLocationUpdated: Navigation engine has provided a new"
                                    + " road-snapped location: "
                                    + location.toString(),
                            DISPLAY_LOG);
                }
            });
} else {
    displayMessage("ERROR: Failed to get a location provider", DISPLAY_LOG);
}

Terima pembaruan waktu dan jarak

Panggil Navigator.addRemainingTimeOrDistanceChangedListener() untuk mendaftarkan callback saat waktu yang tersisa (detik) atau jarak (meter) berubah lebih dari batas tertentu.

Jika perubahan waktu atau jarak melebihi jumlah yang ditentukan, Navigation SDK akan mengaktifkan callback onRemainingTimeOrDistanceChanged().

Untuk menemukan waktu dan jarak yang tersisa, panggil Navigator.getTimeAndDistanceList(). Perhatikan bahwa waktu dan jarak dalam daftar bersifat kumulatif: daftar ini menampilkan waktu dan jarak dari lokasi saat ini ke setiap titik jalan, bukan dari satu titik jalan ke titik jalan lainnya. Objek TimeAndDistance kini juga menampilkan delaySeverity. Enum ini akan berat, sedang, ringan, atau tidak diketahui. Ini sesuai dengan warna yang Anda lihat pada eta di UI peta (berat = merah, sedang = kuning, terang = hijau). Hal ini akan berguna jika Anda perlu membuat footer eta Anda sendiri.

Untuk menghindari kebocoran memori, Anda harus memanggil Navigator.removeRemainingTimeOrDistanceChangedListener(listener) saat tidak lagi memerlukan pemroses.

Contoh di bawah ini meminta callback jika waktu yang tersisa berubah lebih dari 60 detik atau jarak yang tersisa berubah lebih dari 100 meter.

mNavigator.addRemainingTimeOrDistanceChangedListener(60, 100,
        new Navigator.RemainingTimeOrDistanceChangedListener() {
            @Override
            public void onRemainingTimeOrDistanceChanged() {
                displayMessage("onRemainingTimeOrDistanceChanged: Time or distance estimate"
                        + " has changed.",
                        DISPLAY_LOG);
            }
        });

Anda dapat menampilkan informasi waktu dan jarak yang tersisa menggunakan layar bawaan menggunakan metode setEtaCardEnabled() dan meneruskan parameter dengan nilai TRUE. Untuk menyembunyikan tampilan waktu/jarak, tetapkan nilai ini ke FALSE.

Anda juga dapat menampilkan PWT untuk beberapa titik jalan menggunakan metode getTimeAndDistanceList().

Menerima pembaruan rute

Panggil Navigator.addRouteChangedListener() untuk mendaftarkan callback saat rute berubah.

Saat rute berubah, Navigation SDK akan mengaktifkan callback onRouteChanged(). Anda dapat memanggil Navigator.getRouteSegments dan Navigator.getCurrentRouteSegment() untuk menemukan rute baru.

Untuk menghindari kebocoran memori, Anda harus memanggil removeRouteChangedListener(listener) saat tidak lagi memerlukan pemroses.

mNavigator.addRouteChangedListener(new Navigator.RouteChangedListener() {
    @Override
    public void onRouteChanged() {
        displayMessage("onRouteChanged: The driver's route has changed. Current waypoint: "
                + mNavigator.getCurrentRouteSegment().getDestinationWaypoint().getTitle(),
                DISPLAY_LOG);
    }
});

Mendeteksi kapan perubahan mode malam

Panggil NavigationView.addOnNightModeChangedListener atau SupportNavigationFragment.addOnNightModeChangedListener untuk mendaftarkan callback saat mode malam berubah.

Contoh berikut menunjukkan pemrosesan perubahan mode malam pada fragmen navigasi.

mNavFragment.addOnNightModeChangedListener(new NavigationView.OnNightModeChangedListener() {
    @Override
    public void onNightModeChanged(NightModeChangedEvent nightModeChangedEvent) {
        displayMessage("Night mode is active: " + nightModeChangedEvent.inNightMode(),
        DISPLAY_LOG);
    }
});

Catatan: Anda juga dapat menyetel mode malam secara terprogram