geofire android可存储和检索位置并在地图上显示

我正在用android开发一个出租车应用程序。我需要存储、检索和更新出租车的位置，并使用geofire将其显示在地图上。我已使用firebase进行身份验证

需要android geofire的完整教程，但找不到

我也看过SF汽车的例子，但不太了解

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任何帮助都将不胜感激

首先，目前还没有关于geofire的完整教程，所以您可以使用的只是geofire go for java和js的官方文档-- , , 我希望这些能对您有所帮助。

这里还有一些链接

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我为Android创建了一个库，它提供基于地理位置的firestore数据，以查找给定半径内以公里/英里为单位的数据列表

它还可以在单个查询中提供更快的响应，通过实时更新对查询中添加和删除的数据进行分类

你可以参考

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它有很好的文档，因此您可以轻松地开发相同的文档。

下面是一个示例代码，用于获取驱动程序的当前位置

public class MainActivity extends AppCompatActivity implements
    OnMapReadyCallback, PermissionsListener {
// Variables needed to initialize a map
private MapboxMap mapboxMap;
private MapView mapView;
// Variables needed to handle location permissions
private PermissionsManager permissionsManager;
// Variables needed to add the location engine
private LocationEngine locationEngine;
private long DEFAULT_INTERVAL_IN_MILLISECONDS = 1000L;
private long DEFAULT_MAX_WAIT_TIME = DEFAULT_INTERVAL_IN_MILLISECONDS *1;
// Variables needed to listen to location updates
private MainActivityLocationCallback callback = new MainActivityLocationCallback(this);

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Mapbox access token is configured here. This needs to be called either in your application
    // object or in the same activity which contains the mapview.
    Mapbox.getInstance(this, "");

    // This contains the MapView in XML and needs to be called after the access token is configured.
    setContentView(R.layout.activity_main);

    mapView = findViewById(R.id.mapView);
    mapView.onCreate(savedInstanceState);
    mapView.getMapAsync(this);
}

@Override
public void onMapReady(@NonNull final MapboxMap mapboxMap) {
    this.mapboxMap = mapboxMap;

    mapboxMap.setStyle(Style.TRAFFIC_NIGHT,
            new Style.OnStyleLoaded() {
                @Override
                public void onStyleLoaded(@NonNull Style style) {
                    enableLocationComponent(style);
                }
            });
}

/**
 * Initialize the Maps SDK's LocationComponent
 */
@SuppressWarnings( {"MissingPermission"})
private void enableLocationComponent(@NonNull Style loadedMapStyle) {
    // Check if permissions are enabled and if not request
    if (PermissionsManager.areLocationPermissionsGranted(this)) {

        // Get an instance of the component
        LocationComponent locationComponent = mapboxMap.getLocationComponent();

        // Set the LocationComponent activation options
        LocationComponentActivationOptions locationComponentActivationOptions =
                LocationComponentActivationOptions.builder(this, loadedMapStyle)
                        .useDefaultLocationEngine(false)
                        .build();

        // Activate with the LocationComponentActivationOptions object
        locationComponent.activateLocationComponent(locationComponentActivationOptions);

        // Enable to make component visible
        locationComponent.setLocationComponentEnabled(true);

        // Set the component's camera mode
        locationComponent.setCameraMode(CameraMode.TRACKING);

        // Set the component's render mode
        locationComponent.setRenderMode(RenderMode.COMPASS);

        initLocationEngine();
    } else {
        permissionsManager = new PermissionsManager(this);
        permissionsManager.requestLocationPermissions(this);
    }
}

/**
 * Set up the LocationEngine and the parameters for querying the device's location
 */
@SuppressLint("MissingPermission")
private void initLocationEngine() {
    locationEngine = LocationEngineProvider.getBestLocationEngine(this);

    LocationEngineRequest request = new LocationEngineRequest.Builder(DEFAULT_INTERVAL_IN_MILLISECONDS)
            .setPriority(LocationEngineRequest.PRIORITY_HIGH_ACCURACY)
            .setMaxWaitTime(DEFAULT_MAX_WAIT_TIME).build();

    locationEngine.requestLocationUpdates(request, callback, getMainLooper());
    locationEngine.getLastLocation(callback);
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    permissionsManager.onRequestPermissionsResult(requestCode, permissions, grantResults);
}

@Override
public void onExplanationNeeded(List<String> permissionsToExplain) {
    Toast.makeText(this, "Enable Location", Toast.LENGTH_LONG).show();
}

@Override
public void onPermissionResult(boolean granted) {
    if (granted) {
        if (mapboxMap.getStyle() != null) {
            enableLocationComponent(mapboxMap.getStyle());
        }
    } else {
        Toast.makeText(this, "Permission Not Granted", Toast.LENGTH_LONG).show();
        finish();
    }
}

private static class MainActivityLocationCallback
        implements LocationEngineCallback<LocationEngineResult> {

    private final WeakReference<MainActivity> activityWeakReference;

    MainActivityLocationCallback(MainActivity activity) {
        this.activityWeakReference = new WeakReference<>(activity);
    }

    /**
     * The LocationEngineCallback interface's method which fires when the device's location has changed.
     *
     * @param result the LocationEngineResult object which has the last known location within it.
     */
    @Override
    public void onSuccess(LocationEngineResult result) {
        MainActivity activity = activityWeakReference.get();

        if (activity != null) {
            Location location = result.getLastLocation();

            if (location == null) {
                return;
            }
            FirebaseDatabase database = FirebaseDatabase.getInstance();
            String somi_id2 = "emp_samad";
            DatabaseReference myRef3 = database.getReference("current");
            GeoFire geoFire = new GeoFire(myRef3);
            geoFire.setLocation(somi_id2,new GeoLocation(location.getLatitude(),location.getLongitude()));

            Toast.makeText(activity,String.valueOf(location.getLatitude()+"\n"+String.valueOf(location.getLongitude())),Toast.LENGTH_SHORT).show();

            // Pass the new location to the Maps SDK's LocationComponent
            if (activity.mapboxMap != null && result.getLastLocation() != null) {
                activity.mapboxMap.getLocationComponent().forceLocationUpdate(result.getLastLocation());
            }
        }
    }

    /**
     * The LocationEngineCallback interface's method which fires when the device's location can not be captured
     *
     * @param exception the exception message
     */
    @Override
    public void onFailure(@NonNull Exception exception) {
        Log.d("LocationChangeActivity", exception.getLocalizedMessage());
        MainActivity activity = activityWeakReference.get();
        if (activity != null) {
            Toast.makeText(activity, exception.getLocalizedMessage(),
                    Toast.LENGTH_SHORT).show();
        }
    }
}

@Override
protected void onStart() {
    super.onStart();
    mapView.onStart();
}

@Override
protected void onResume() {
    super.onResume();
    mapView.onResume();
}

@Override
protected void onPause() {
    super.onPause();
    mapView.onPause();
}

@Override
protected void onStop() {
    super.onStop();
    mapView.onStop();
}

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    mapView.onSaveInstanceState(outState);
}

@Override
protected void onDestroy() {
    super.onDestroy();
    // Prevent leaks
    if (locationEngine != null) {
        locationEngine.removeLocationUpdates(callback);
    }
    mapView.onDestroy();
}

@Override
public void onLowMemory() {
    super.onLowMemory();
    mapView.onLowMemory();
}
}

我希望这会对你有很大帮助

    public class MainActivity extends AppCompatActivity  
      implements
        OnMapReadyCallback, PermissionsListener{

    private MapView mapView;
    private PermissionsManager permissionsManager;
    private MapboxMap mapboxMap;
    private GeoJsonSource geoJsonSource;
    private ValueAnimator animator;
    public static double pre_lat,pre_long;
    public static Marker marker;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Mapbox.getInstance(this, "*YOUR_KEY*");
        setContentView(R.layout.activity_main);

        Mapbox.getInstance(this, "");

        mapView = findViewById(R.id.mapView);
        //fetchData process = new fetchData();
        // process.execute();
        mapView.onCreate(savedInstanceState);
        mapView.getMapAsync(new OnMapReadyCallback() {
            @Override
            public void onMapReady(@NonNull final MapboxMap mapboxMap) {
                MainActivity.this.mapboxMap = mapboxMap;
                mapboxMap.setCameraPosition(new CameraPosition.Builder()
                        .zoom(19)
                        .target(new 
       LatLng(24.987029999999997,67.056585))
                        .build());
                mapboxMap.setStyle(Style.DARK,
                        new Style.OnStyleLoaded() {
                            @Override
                            public void onStyleLoaded(@NonNull Style style) {
                               // enableLocationComponent(style);
                                // Create an Icon object for the marker to use

                                FirebaseDatabase database = FirebaseDatabase.getInstance();
                                String somi_id2 = "emp_samad";
                                DatabaseReference myRef3 = database.getReference("current");
                                GeoFire geoFire = new GeoFire(myRef3);
                                GeoQuery geoQuery = geoFire.queryAtLocation(new GeoLocation(24.987043333333336, 67.05663333333334), 10);
                                geoFire.getLocation("emp_samad", new LocationCallback() {
                                    @Override
                                    public void onLocationResult(String key, GeoLocation location) {
                                        if (location != null) {
                                            pre_lat = location.latitude;
                                            pre_long = location.longitude;
//                                            Location prevLoc = new Location(location.latitude,location.longitude);
//                                            Location newLoc =  ;
//                                            float bearing = prevLoc.bearingTo(newLoc) ;
                                            marker = mapboxMap.addMarker(new MarkerOptions()
                                                    .position(new LatLng(pre_lat,pre_long))
                                                    .icon(IconFactory.getInstance(MainActivity.this).fromResource(R.drawable.marker)));
                                            System.out.println(String.format("The location for key %s is [%f,%f]", key, location.latitude, location.longitude));
                                        } else {
                                            System.out.println(String.format("There is no location for key %s in GeoFire", key));
                                        }
                                    }

                                    @Override
                                    public void onCancelled(DatabaseError databaseError) {

                                    }
                                });
                                geoQuery.addGeoQueryDataEventListener(new GeoQueryDataEventListener() {
                                    @Override
                                    public void onDataEntered(DataSnapshot dataSnapshot, GeoLocation location) {
                                        System.out.println(String.format("The location is [%f,%f]", location.latitude, location.longitude));
                                    }

                                    @Override
                                    public void onDataExited(DataSnapshot dataSnapshot) {

                                    }

                                    @Override
                                    public void onDataMoved(DataSnapshot dataSnapshot, GeoLocation location) {

                                    }

                                    @Override
                                    public void onDataChanged(DataSnapshot dataSnapshot, GeoLocation location) {
                                        double lat = pre_lat;
                                        double lon = pre_long;

                                        LatLng pre_latlng = new LatLng(lat,lon);
                                        LatLng washington = new LatLng(location.latitude,location.longitude);



                                        ValueAnimator markerAnimator = ValueAnimator.ofObject(new TypeEvaluator<LatLng>() {

                                            @Override
                                            public LatLng evaluate(float fraction, LatLng startValue, LatLng endValue) {
                                                return new LatLng(startValue.getLatitude() + (endValue.getLatitude() - startValue.getLatitude()) * fraction, startValue.getLongitude() + (endValue.getLongitude() - startValue.getLongitude()) * fraction);
                                            }

                                        }, new LatLng[]{pre_latlng, washington});

                                        markerAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
                                            @Override
                                            public void onAnimationUpdate(ValueAnimator animation) {
                                                if (marker != null) {
                                                    marker.setPosition((LatLng) animation.getAnimatedValue());
                                                }
                                            }
                                        });

                                        markerAnimator.setDuration(7500);
                                        //markerAnimator.setRepeatCount(ValueAnimator.INFINITE);
                                        //markerAnimator.setRepeatMode(ValueAnimator.REVERSE);
                                        markerAnimator.setInterpolator(new AccelerateDecelerateInterpolator());

                                        markerAnimator.start();

                                       /* if(marker!=null)
                                        {
                                            //marker.remove();
                                            //marker.setPosition(new LatLng(location.latitude,location.longitude));
                                        }
                                        System.out.println(String.format("The location is [%f,%f]", location.latitude, location.longitude));
*/

                                       }



                                    @Override
                                    public void onGeoQueryReady() {

                                    }

                                    @Override
                                    public void onGeoQueryError(DatabaseError error) {

                                    }
                                });
                            }
                        });
            }
        });
    }

    @SuppressWarnings( {"MissingPermission"})
    private void enableLocationComponent(@NonNull Style loadedMapStyle) {
// Check if permissions are enabled and if not request
        if (PermissionsManager.areLocationPermissionsGranted(this)) {

// Get an instance of the component
            LocationComponent locationComponent = mapboxMap.getLocationComponent();

// Activate with options
            locationComponent.activateLocationComponent(
                    LocationComponentActivationOptions.builder(this, loadedMapStyle).build());

// Enable to make component visible
            locationComponent.setLocationComponentEnabled(true);

// Set the component's camera mode
            locationComponent.setCameraMode(CameraMode.TRACKING);

// Set the component's render mode
            locationComponent.setRenderMode(RenderMode.COMPASS);
        } else {
            permissionsManager = new PermissionsManager(this);
            permissionsManager.requestLocationPermissions(this);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        permissionsManager.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }

    @Override
    public void onExplanationNeeded(List<String> permissionsToExplain) {
        Toast.makeText(this, "Enable Location", Toast.LENGTH_LONG).show();
    }



    @Override
    public void onPermissionResult(boolean granted) {
        if (granted) {
            mapboxMap.getStyle(new Style.OnStyleLoaded() {
                @Override
                public void onStyleLoaded(@NonNull Style style) {
                   // enableLocationComponent(style);
                }
            });
        } else {
            Toast.makeText(this, "Permission Not Granted", Toast.LENGTH_LONG).show();
            // finish();
        }
    }

    @Override
    @SuppressWarnings( {"MissingPermission"})
    public void onStart() {
        super.onStart();
        mapView.onStart();

    }

    @Override
    public void onResume() {
        super.onResume();
        mapView.onResume();
    }

    @Override
    public void onPause() {
        super.onPause();
        mapView.onPause();
    }

    @Override
    public void onStop() {
        super.onStop();
        mapView.onStop();
    }

    @Override
    public void onLowMemory() {
        super.onLowMemory();
        mapView.onLowMemory();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mapView.onDestroy();
    }

    @Override
    public void onMapReady(@NonNull MapboxMap mapboxMap) 
    {

    }


    }

implementation 'com.firebase:geofire-android:3.0.0'