修改導覽 UI

顯示/隱藏導覽活動的 Java 程式碼。

package com.example.navsdkcustomization;

import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
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;
import com.google.android.gms.maps.GoogleMap.CameraPerspective;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
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.SimulationOptions;
import com.google.android.libraries.navigation.StylingOptions;
import com.google.android.libraries.navigation.SupportNavigationFragment;
import com.google.android.libraries.navigation.Waypoint;

/** An activity that displays a map and a customized navigation UI. */
public class NavigationActivityCustomization extends AppCompatActivity {

  private static final String TAG = NavigationActivityCustomization.class.getSimpleName();
  private Navigator mNavigator;
  private SupportNavigationFragment mNavFragment;
  private GoogleMap mMap;
  // Define the Sydney Opera House by specifying its place ID.
  private static final String SYDNEY_OPERA_HOUSE = "ChIJ3S-JXmauEmsRUcIaWtf4MzE";
  // Set fields for requesting location permission.
  private static final int PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 1;
  private boolean mLocationPermissionGranted;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

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

  /**
   * Starts the Navigation SDK and sets the camera to follow the device's location. Calls the
   * navigateToPlace() 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.");
      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.");
            mNavigator = navigator;
            mNavFragment =
                (SupportNavigationFragment)
                    getSupportFragmentManager().findFragmentById(R.id.navigation_fragment);

            // Get the map.
            mNavFragment.getMapAsync(
                new OnMapReadyCallback() {
                  @Override
                  public void onMapReady(GoogleMap map) {
                    mMap = map;
                    // Navigate to a place, specified by Place ID.
                    navigateToPlace(SYDNEY_OPERA_HOUSE);
                  }
                });
          }

          /**
           * 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.");
                break;
              case NavigationApi.ErrorCode.TERMS_NOT_ACCEPTED:
                displayMessage(
                    "Error loading Navigation SDK: User did not accept "
                        + "the Navigation Terms of Use.");
                break;
              case NavigationApi.ErrorCode.NETWORK_ERROR:
                displayMessage("Error loading Navigation SDK: Network error.");
                break;
              case NavigationApi.ErrorCode.LOCATION_PERMISSION_MISSING:
                displayMessage(
                    "Error loading Navigation SDK: Location permission " + "is missing.");
                break;
              default:
                displayMessage("Error loading Navigation SDK: " + errorCode);
            }
          }
        });
  }

  /** Customizes the navigation UI and the map. */
  private void customizeNavigationUI() {
    // Set custom colors for the navigator.
    mNavFragment.setStylingOptions(
        new StylingOptions()
            .primaryDayModeThemeColor(0xff1A237E)
            .secondaryDayModeThemeColor(0xff3F51B5)
            .primaryNightModeThemeColor(0xff212121)
            .secondaryNightModeThemeColor(0xff424242)
            .headerLargeManeuverIconColor(0xffffff00)
            .headerSmallManeuverIconColor(0xffffa500)
            .headerNextStepTypefacePath("/system/fonts/NotoSerif-BoldItalic.ttf")
            .headerNextStepTextColor(0xff00ff00)
            .headerNextStepTextSize(20f)
            .headerDistanceTypefacePath("/system/fonts/NotoSerif-Italic.ttf")
            .headerDistanceValueTextColor(0xff00ff00)
            .headerDistanceUnitsTextColor(0xff0000ff)
            .headerDistanceValueTextSize(20f)
            .headerDistanceUnitsTextSize(18f)
            .headerInstructionsTypefacePath("/system/fonts/NotoSerif-BoldItalic.ttf")
            .headerInstructionsTextColor(0xffffff00)
            .headerInstructionsFirstRowTextSize(24f)
            .headerInstructionsSecondRowTextSize(20f)
            .headerGuidanceRecommendedLaneColor(0xffffa500));

    mMap.setTrafficEnabled(false);

    // Place a marker at the final destination.
    if (mNavigator.getCurrentRouteSegment() != null) {
      LatLng destinationLatLng = mNavigator.getCurrentRouteSegment().getDestinationLatLng();

      Bitmap destinationMarkerIcon =
          BitmapFactory.decodeResource(getResources(), R.drawable.ic_person_pin_48dp);

      mMap.addMarker(
          new MarkerOptions()
              .position(destinationLatLng)
              .icon(BitmapDescriptorFactory.fromBitmap(destinationMarkerIcon))
              .title("Destination marker"));

      // Listen for a tap on the marker.
      mMap.setOnMarkerClickListener(
          new GoogleMap.OnMarkerClickListener() {
            @Override
            public boolean onMarkerClick(Marker marker) {
              displayMessage(
                  "Marker tapped: "
                      + marker.getTitle()
                      + ", at location "
                      + marker.getPosition().latitude
                      + ", "
                      + marker.getPosition().longitude);

              // The event has been handled.
              return true;
            }
          });
    }

    // Set the camera to follow the device location with 'TILTED' driving view.
    mMap.followMyLocation(CameraPerspective.TILTED);
  }

  /**
   * Requests directions from the user's current location to a specific place (provided by the
   * Google Places API).
   */
  private void navigateToPlace(String placeId) {
    Waypoint destination;
    try {
      destination =
          Waypoint.builder().setPlaceIdString(placeId).build();
    } catch (Waypoint.UnsupportedPlaceIdException e) {
      displayMessage("Error starting navigation: Place ID is not supported.");
      return;
    }

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

    // 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:
                // Hide the toolbar to maximize the navigation UI.
                if (getActionBar() != null) {
                  getActionBar().hide();
                }

                // Customize the navigation UI.
                customizeNavigationUI();

                // 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.");
                break;
              case NETWORK_ERROR:
                displayMessage("Error starting navigation: Network error.");
                break;
              case ROUTE_CANCELED:
                displayMessage("Error starting navigation: Route canceled.");
                break;
              default:
                displayMessage("Error starting navigation: " + String.valueOf(code));
            }
          }
        });
  }

  /** 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) {
    Toast.makeText(this, errorMessage, Toast.LENGTH_LONG).show();
    Log.d(TAG, errorMessage);
  }
}