規劃多目的地路線

請按照本指南的說明，使用 Navigation SDK for Android 在應用程式中繪製前往多個目的地 (也稱為路徑點) 的路線。

總覽

  1. 按照「設定專案」一節所述，將 Navigation SDK 整合至應用程式。
  2. 將 SupportNavigationFragment 或 NavigationView 新增至應用程式。這個 UI 元素會將互動式地圖和即時路線導航 UI 新增至活動。
  3. 使用 NavigationApi 類別初始化 SDK。

  4. 定義 Navigator 以控制即時路線導航：

  5. 建構並執行應用程式。

查看程式碼

package com.example.navsdkmultidestination;

import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import com.google.android.gms.maps.GoogleMap.CameraPerspective;
import com.google.android.libraries.navigation.ArrivalEvent;
import com.google.android.libraries.navigation.ListenableResultFuture;
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)
                    getSupportFragmentManager().findFragmentById(R.id.navigation_fragment);

            // Set the camera to follow the device location with 'TILTED' driving view.
            mNavFragment.getMapAsync(
                googleMap -> googleMap.followMyLocation(CameraPerspective.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(Location location) {
            displayMessage(
                "onLocationUpdated: Navigation engine has provided a new"
                    + " road-snapped location: "
                    + location.toString(),
                DISPLAY_LOG);
          }

          @Override
          public void onRawLocationUpdate(Location location) {
            displayMessage(
                "onLocationUpdated: Navigation engine has provided a new"
                    + " raw location: "
                    + location.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);
    }
  }
}

新增導覽片段

SupportNavigationFragment 是 UI 元件，可顯示導航的視覺輸出內容，包括互動式地圖和即時路線指引。您可以在 XML 版面配置檔案中宣告片段，如下所示：

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    android:name="com.google.android.libraries.navigation.SupportNavigationFragment"
    android:id="@+id/navigation_fragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

或者，您也可以使用 FragmentActivity.getSupportFragmentManager()，按照 Android 說明文件的說明，以程式輔助方式建構 Fragment。

除了片段之外，UI 元件也可以做為 NavigationView 使用。在大多數情況下，我們建議使用 SupportNavigationFragment，這是 NavigationView 的包裝函式，而非直接與 NavigationView 互動。詳情請參閱導覽地圖互動最佳做法 。

要求位置存取權

應用程式必須要求位置存取權，才能判斷裝置的位置。

本教學課程會提供您需要的程式碼，用於要求精確位置權限。詳情請參閱 Android 權限指南。

  1. 在 Android 資訊清單中，將權限新增為 <manifest> 元素的子項：

    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.navsdkmultidestination">
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
</manifest>

  2. 在應用程式中要求執行階段權限，讓使用者有機會允許或拒絕位置權限。下列程式碼會檢查使用者是否已授予精確位置權限。如果不是，則要求權限：

    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;
}

  3. 覆寫 onRequestPermissionsResult() 回呼，以便處理權限要求的結果：

    @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;
            }
        }
    }
}

初始化 Navigation SDK 並設定旅程

NavigationApi 類別提供初始化邏輯，授權應用程式使用 Google 導航功能。Navigator 類別可讓您控制導覽路徑的設定及開始/停止。

  1. 建立輔助方法，在畫面和記錄中顯示訊息。

    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);
    }
}

  2. 初始化 Navigation SDK，並覆寫 onNavigatorReady() 回呼，以便在導航器就緒時啟動導航功能：

    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);
                }
            }
        });

  3. 新增方法，從指定地點 ID 和標題建立 Waypoint 物件。

    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);
    }
}

  4. 新增方法，用來顯示計算的到達每個路標的時間和距離。

    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);
}

  5. 設定此行程的所有路線點。(請注意，如果您使用導航器無法繪製路線的地點 ID，可能會收到錯誤訊息。本教學課程的範例應用程式會使用澳洲境內路徑點的位置 ID。請參閱下方的附註，瞭解如何取得不同的 Place ID)。計算路線後，SupportNavigationFragment 會在地圖上顯示代表路線的多邊形，並在每個路標上加上標記。

    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);
                    }
                }
            });
}

建構並執行應用程式

  1. 將 Android 裝置連接到電腦。按照操作說明為 Android 裝置啟用開發人員選項，並將系統設定為偵測裝置 (您也可以使用 Android 虛擬裝置管理工具 (AVD Manager) 來設定虛擬裝置。選擇模擬器時，請務必選取包含 Google API 的映像檔)。
  2. 在 Android Studio 中，按一下「Run」(執行) 選單選項 (或播放按鈕圖示)，然後按照系統提示選擇裝置。

改善使用者體驗的提示

  • 使用者必須接受《Google 導航服務條款》，才能使用導航功能。您只需接受一次。根據預設，SDK 會在第一次叫用導覽器時提示接受。如有需要，您可以使用 showTermsAndConditionsDialog()，在應用程式的 UX 流程中 (例如註冊或登入期間) 的早期觸發導覽服務條款對話方塊。
  • 如果您使用地點 ID 初始化路線點，而不是經緯度目的地，導航品質和預估到達時間的準確度會大幅提升。

  • 這個範例會從特定地點 ID 衍生出中途點。取得地點 ID 的其他方式包括：