java - 在 Google 地图上更改位置后更新 TextView

package com.example.currentplacedetailsonmap; import android.content.DialogInterface; import android.content.pm.PackageManager; import android.location.Location; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.FrameLayout; import android.widget.LinearLayout; import android.widget.RelativeLayout; import android.widget.TextView; import androidx.annotation.NonNull; import androidx.appcompat.app.AlertDialog; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.ActivityCompat; import androidx.core.content.ContextCompat; import com.google.android.gms.location.FusedLocationProviderClient; import com.google.android.gms.location.LocationServices; import com.google.android.gms.maps.CameraUpdateFactory; import com.google.android.gms.maps.GoogleMap; import com.google.android.gms.maps.OnMapReadyCallback; import com.google.android.gms.maps.SupportMapFragment; import com.google.android.gms.maps.model.CameraPosition; 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.gms.tasks.OnCompleteListener; import com.google.android.gms.tasks.Task; import com.google.android.libraries.places.api.Places; import com.google.android.libraries.places.api.model.Place; import com.google.android.libraries.places.api.model.PlaceLikelihood; import com.google.android.libraries.places.api.net.FindCurrentPlaceRequest; import com.google.android.libraries.places.api.net.FindCurrentPlaceResponse; import com.google.android.libraries.places.api.net.PlacesClient; import org.w3c.dom.Text; import java.util.Arrays; import java.util.List; import static com.example.currentplacedetailsonmap.R.id.coordinates; /** * An activity that displays a map showing the place at the device's current location. */ public class MapsActivityCurrentPlace extends AppCompatActivity implements OnMapReadyCallback { private static final String TAG = MapsActivityCurrentPlace.class.getSimpleName(); private GoogleMap map; // The entry point to the Places API. private PlacesClient placesClient; // The entry point to the Fused Location Provider. private FusedLocationProviderClient fusedLocationProviderClient; // A default location (Sydney, Australia) and default zoom to use when location permission is // not granted. private final LatLng defaultLocation = new LatLng(-33.8523341, 151.2106085); private static final int DEFAULT_ZOOM = 15; private static final int PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 1; private boolean locationPermissionGranted; // The geographical location where the device is currently located. That is, the last-known // location retrieved by the Fused Location Provider. private Location lastKnownLocation; // Keys for storing activity state. // [START maps_current_place_state_keys] private static final String KEY_CAMERA_POSITION = "camera_position"; private static final String KEY_LOCATION = "location"; // [END maps_current_place_state_keys] // Used for selecting the current place. private static final int M_MAX_ENTRIES = 5; private String[] likelyPlaceNames; private String[] likelyPlaceAddresses; private List[] likelyPlaceAttributions; private LatLng[] likelyPlaceLatLngs; // [START maps_current_place_on_create] @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // [START_EXCLUDE silent] // [START maps_current_place_on_create_save_instance_state] // Retrieve location and camera position from saved instance state. if (savedInstanceState != null) { lastKnownLocation = savedInstanceState.getParcelable(KEY_LOCATION); } // [END maps_current_place_on_create_save_instance_state] // [END_EXCLUDE] // Retrieve the content view that renders the map. setContentView(R.layout.activity_maps); // [START_EXCLUDE silent] // Construct a PlacesClient Places.initialize(getApplicationContext(), BuildConfig.MAPS_API_KEY); placesClient = Places.createClient(this); // Construct a FusedLocationProviderClient. fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this); // Build the map. // [START maps_current_place_map_fragment] SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager() .findFragmentById(R.id.map); mapFragment.getMapAsync(this); // [END maps_current_place_map_fragment] // [END_EXCLUDE] } // [END maps_current_place_on_create] /** * Saves the state of the map when the activity is paused. */ // [START maps_current_place_on_save_instance_state] @Override protected void onSaveInstanceState(Bundle outState) { if (map != null) { outState.putParcelable(KEY_CAMERA_POSITION, map.getCameraPosition()); outState.putParcelable(KEY_LOCATION, lastKnownLocation); } super.onSaveInstanceState(outState); } // [END maps_current_place_on_save_instance_state] /** * Sets up the options menu. * @param menu The options menu. * @return Boolean. */ @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.current_place_menu, menu); return true; } /** * Handles a click on the menu option to get a place. * @param item The menu item to handle. * @return Boolean. */ // [START maps_current_place_on_options_item_selected] @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getItemId() == R.id.option_get_place) { showCurrentPlace(); } return true; } // [END maps_current_place_on_options_item_selected] /** * Manipulates the map when it's available. * This callback is triggered when the map is ready to be used. */ // [START maps_current_place_on_map_ready] @Override public void onMapReady(GoogleMap map) { this.map = map; // [START_EXCLUDE] // [START map_current_place_set_info_window_adapter] // Use a custom info window adapter to handle multiple lines of text in the // info window contents. this.map.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter() { @Override // Return null here, so that getInfoContents() is called next. public View getInfoWindow(Marker arg0) { return null; } @Override public View getInfoContents(Marker marker) { // Inflate the layouts for the info window, title and snippet. View infoWindow = getLayoutInflater().inflate(R.layout.custom_info_contents, (FrameLayout) findViewById(R.id.map), false); TextView title = infoWindow.findViewById(R.id.title); title.setText(marker.getTitle()); TextView snippet = infoWindow.findViewById(R.id.snippet); snippet.setText(marker.getSnippet()); return infoWindow; } }); // [END map_current_place_set_info_window_adapter] // Prompt the user for permission. getLocationPermission(); // [END_EXCLUDE] // Turn on the My Location layer and the related control on the map. updateLocationUI(); // Get the current location of the device and set the position of the map. getDeviceLocation(); } // [END maps_current_place_on_map_ready] /** * Gets the current location of the device, and positions the map's camera. */ // [START maps_current_place_get_device_location] private void getDeviceLocation() { /* * Get the best and most recent location of the device, which may be null in rare * cases when a location is not available. */ try { if (locationPermissionGranted) { Task<Location> locationResult = fusedLocationProviderClient.getLastLocation(); locationResult.addOnCompleteListener(this, new OnCompleteListener<Location>() { @Override public void onComplete(@NonNull Task<Location> task) { if (task.isSuccessful()) { // Set the map's camera position to the current location of the device. lastKnownLocation = task.getResult(); if (lastKnownLocation != null) { TextView coordinates = (TextView) findViewById(R.id.coordinates); LatLng latLng = new LatLng(lastKnownLocation.getLatitude(), lastKnownLocation.getLongitude()); coordinates.setText(latLng.toString()); map.moveCamera(CameraUpdateFactory.newLatLngZoom( new LatLng(lastKnownLocation.getLatitude(), lastKnownLocation.getLongitude()), DEFAULT_ZOOM)); } } else { Log.d(TAG, "Current location is null. Using defaults."); Log.e(TAG, "Exception: %s", task.getException()); map.moveCamera(CameraUpdateFactory .newLatLngZoom(defaultLocation, DEFAULT_ZOOM)); map.getUiSettings().setMyLocationButtonEnabled(false); } } }); } } catch (SecurityException e) { Log.e("Exception: %s", e.getMessage(), e); } } // [END maps_current_place_get_device_location] /** * Prompts the user for permission to use the device location. */ // [START maps_current_place_location_permission] private void getLocationPermission() { /* * 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) { locationPermissionGranted = true; } else { ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION); } } // [END maps_current_place_location_permission] /** * Handles the result of the request for location permissions. */ // [START maps_current_place_on_request_permissions_result] @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { locationPermissionGranted = false; switch (requestCode) { case PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION: { // If request is cancelled, the result arrays are empty. if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { locationPermissionGranted = true; } } } updateLocationUI(); } // [END maps_current_place_on_request_permissions_result] /** * Prompts the user to select the current place from a list of likely places, and shows the * current place on the map - provided the user has granted location permission. */ // [START maps_current_place_show_current_place] private void showCurrentPlace() { if (map == null) { return; } if (locationPermissionGranted) { // Use fields to define the data types to return. List<Place.Field> placeFields = Arrays.asList(Place.Field.NAME, Place.Field.ADDRESS, Place.Field.LAT_LNG); // Use the builder to create a FindCurrentPlaceRequest. FindCurrentPlaceRequest request = FindCurrentPlaceRequest.newInstance(placeFields); // Get the likely places - that is, the businesses and other points of interest that // are the best match for the device's current location. @SuppressWarnings("MissingPermission") final Task<FindCurrentPlaceResponse> placeResult = placesClient.findCurrentPlace(request); placeResult.addOnCompleteListener (new OnCompleteListener<FindCurrentPlaceResponse>() { @Override public void onComplete(@NonNull Task<FindCurrentPlaceResponse> task) { if (task.isSuccessful() && task.getResult() != null) { FindCurrentPlaceResponse likelyPlaces = task.getResult(); // Set the count, handling cases where less than 5 entries are returned. int count; if (likelyPlaces.getPlaceLikelihoods().size() < M_MAX_ENTRIES) { count = likelyPlaces.getPlaceLikelihoods().size(); } else { count = M_MAX_ENTRIES; } int i = 0; likelyPlaceNames = new String[count]; likelyPlaceAddresses = new String[count]; likelyPlaceAttributions = new List[count]; likelyPlaceLatLngs = new LatLng[count]; for (PlaceLikelihood placeLikelihood : likelyPlaces.getPlaceLikelihoods()) { // Build a list of likely places to show the user. likelyPlaceNames[i] = placeLikelihood.getPlace().getName(); likelyPlaceAddresses[i] = placeLikelihood.getPlace().getAddress(); likelyPlaceAttributions[i] = placeLikelihood.getPlace() .getAttributions(); likelyPlaceLatLngs[i] = placeLikelihood.getPlace().getLatLng(); i++; if (i > (count - 1)) { break; } } // Show a dialog offering the user the list of likely places, and add a // marker at the selected place. MapsActivityCurrentPlace.this.openPlacesDialog(); } else { Log.e(TAG, "Exception: %s", task.getException()); } } }); } else { // The user has not granted permission. Log.i(TAG, "The user did not grant location permission."); // Add a default marker, because the user hasn't selected a place. map.addMarker(new MarkerOptions() .title(getString(R.string.default_info_title)) .position(defaultLocation) .snippet(getString(R.string.default_info_snippet))); // Prompt the user for permission. getLocationPermission(); } } // [END maps_current_place_show_current_place] /** * Displays a form allowing the user to select a place from a list of likely places. */ // [START maps_current_place_open_places_dialog] private void openPlacesDialog() { // Ask the user to choose the place where they are now. DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // The "which" argument contains the position of the selected item. LatLng markerLatLng = likelyPlaceLatLngs[which]; String markerSnippet = likelyPlaceAddresses[which]; if (likelyPlaceAttributions[which] != null) { markerSnippet = markerSnippet + "\n" + likelyPlaceAttributions[which]; } // Add a marker for the selected place, with an info window // showing information about that place. map.addMarker(new MarkerOptions() .title(likelyPlaceNames[which]) .position(markerLatLng) .snippet(markerSnippet)); // Position the map's camera at the location of the marker. map.moveCamera(CameraUpdateFactory.newLatLngZoom(markerLatLng, DEFAULT_ZOOM)); } }; } // [END maps_current_place_open_places_dialog] /** * Updates the map's UI settings based on whether the user has granted location permission. */ // [START maps_current_place_update_location_ui] private void updateLocationUI() { if (map == null) { return; } try { if (locationPermissionGranted) { map.setMyLocationEnabled(true); map.getUiSettings().setMyLocationButtonEnabled(true); } else { map.setMyLocationEnabled(false); map.getUiSettings().setMyLocationButtonEnabled(false); lastKnownLocation = null; getLocationPermission(); } } catch (SecurityException e) { Log.e("Exception: %s", e.getMessage()); } } // [END maps_current_place_update_location_ui] }

private void getDeviceLocation() { /* * Get the best and most recent location of the device, which may be null in rare * cases when a location is not available. */ try { if (locationPermissionGranted) { Task<Location> locationResult = fusedLocationProviderClient.getLastLocation(); locationResult.addOnCompleteListener(this, new OnCompleteListener<Location>() { @Override public void onComplete(@NonNull Task<Location> task) { if (task.isSuccessful()) { // Set the map's camera position to the current location of the device. lastKnownLocation = task.getResult(); if (lastKnownLocation != null) { TextView coordinates = (TextView) findViewById(R.id.coordinates); LatLng latLng = new LatLng(lastKnownLocation.getLatitude(), lastKnownLocation.getLongitude()); coordinates.setText(latLng.toString()); map.moveCamera(CameraUpdateFactory.newLatLngZoom( new LatLng(lastKnownLocation.getLatitude(), lastKnownLocation.getLongitude()), DEFAULT_ZOOM)); } } else { Log.d(TAG, "Current location is null. Using defaults."); Log.e(TAG, "Exception: %s", task.getException()); map.moveCamera(CameraUpdateFactory .newLatLngZoom(defaultLocation, DEFAULT_ZOOM)); map.getUiSettings().setMyLocationButtonEnabled(false); } } }); } } catch (SecurityException e) { Log.e("Exception: %s", e.getMessage(), e); } }