浏览多目的地路线

按照本指南中的说明,使用 Android 版 Navigation SDK 在您的应用中绘制到多个目的地(也称为航点)的路线。

  1. 将 Navigation SDK 集成到您的应用中,如设置项目中所述。
  2. 向您的应用添加 SupportNavigationFragmentNavigationView。此界面元素会向您的 activity 添加交互式地图和精细导航界面。
  3. 使用 NavigationApi 类初始化 SDK。
  4. 定义 Navigator 以控制精细导航:

  5. 构建并运行您的应用。

查看代码

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);
    }
  }
}

添加导航 fragment

SupportNavigationFragment 是用于显示导航视觉输出的界面组件,包括交互式地图和精细导航路线。您可以在 XML 布局文件中声明 fragment,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() 以编程方式构建 fragment,如 Android 文档中所述。

作为 fragment 的替代方案,界面组件还可作为 NavigationView 使用。在大多数情况下,我们建议使用 SupportNavigationFragment(即 NavigationView 的封装容器),而不是直接与 NavigationView 交互。如需了解详情,请参阅导航地图互动最佳实践

请求位置权限

您的应用必须请求位置信息权限,才能确定设备的位置。

本教程提供了请求精确位置信息权限所需的代码。 如需了解详情,请参阅 Android 权限指南。

  1. 在 Android 清单中将权限添加为 <manifest> 元素的子元素:

    <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. 在应用中请求运行时权限,让用户有机会允许或拒绝位置信息权限。以下代码会检查用户是否已授予精确位置信息权限。如果未授予,它将请求此权限:

    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. 替换 onRequestPermissionsResult() 回调以处理权限请求的结果:

    @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 并配置行程

NavigationApi 类提供初始化逻辑,用于授权您的应用使用 Google 导航。Navigator 类可用于控制导航历程的配置以及启动/停止导航历程。

  1. 创建一个辅助方法,用于在屏幕上和日志中显示消息。

    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 并替换 onNavigatorReady() 回调,以便在导航器准备就绪时启动导航:

    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. 添加了一种方法,用于根据给定地点 ID 和标题创建 Waypoint 对象。

    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. 添加一个方法,用于显示计算的行程时间和到每个航点的距离。

    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. 设置此行程的所有航点。(请注意,如果您使用导航器无法绘制路线的地点 ID,可能会收到错误消息。本教程中的示例应用使用澳大利亚的航点的地点 ID。请参阅下文中有关获取不同的地点 ID 的说明。)计算路线后,SupportNavigationFragment 会在地图上显示一条多段线来表示路线,并在每个航点处显示一个标记。

    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);
                        }
                    }
                });
    }
    

构建并运行应用

  1. 将 Android 设备连接到您的计算机。按照说明在您的 Android 设备上启用开发者选项,并配置您的系统,使之检测该设备。您也可以使用 Android 虚拟设备 (AVD) 管理器来配置虚拟设备。选择模拟器时,请务必选择包含 Google API 的映像。)
  2. 在 Android Studio 中,点击 Run 菜单选项(或 Play 按钮图标)。按提示选择设备。

有关如何提升用户体验的提示

  • 用户必须先接受《Google 导航服务条款》,然后才能使用导航功能。您只需接受一次即可。默认情况下,SDK 会在首次调用导航器时提示用户接受。如果您愿意,可以在应用用户体验流程的早期(例如注册或登录期间)使用 showTermsAndConditionsDialog() 触发导航服务条款对话框。
  • 如果您使用地点 ID 初始化航点(而不是经纬度目的地),导航质量和预计到达时间 (ETA) 准确性会显著提高。
  • 此示例会根据特定地点 ID 派生航点。获取地点 ID 的其他方法包括: