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java - 如何从地图中的标记获取纬度和经度

问题描述

我使用此函数getLocation从设备获取纬度和经度。但我正在寻找的是一种使用标记的方法，将其定位在地图mapView中并获取它的纬度和经度。有例子吗？

一种方法是在地图中心做一个标记，然后移动地图直到标记位于地图的所需位置，然后读取标记的经度和纬度

public void getLocation() {
        try {
            locationManager = (LocationManager) this.getSystemService(LOCATION_SERVICE);

            // getting GPS status
            boolean isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);

            // getting network status
            boolean isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } else {
                // First get location from Network Provider
                if (isNetworkEnabled) {
                    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                        // TODO: Consider calling
                        //    ActivityCompat#requestPermissions
                        // here to request the missing permissions, and then overriding
                        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                        //                                          int[] grantResults)
                        // to handle the case where the user grants the permission. See the documentation
                        // for ActivityCompat#requestPermissions for more details.
                        return;
                    }
                    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
                    Log.d("Network", "Network");
                    if (locationManager != null) {
                        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                            // TODO: Consider calling
                            //    ActivityCompat#requestPermissions
                            // here to request the missing permissions, and then overriding
                            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                            //                                          int[] grantResults)
                            // to handle the case where the user grants the permission. See the documentation
                            // for ActivityCompat#requestPermissions for more details.
                            //return TODO;
                        }
                        location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitud = location.getLatitude();
                            longitud = location.getLongitude();
                        }
                    }
                }
                //get the location by gps
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitud = location.getLatitude();
                                longitud = location.getLongitude();
                            }
                        }
                    }
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

标签： javaandroid

解决方案

另一种选择是在用户触摸 mapView 时监听事件

googleMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {

        @Override
        public void onMapClick(LatLng point) {
               
                googleMap.addMarker(new MarkerOptions()
                        .position(new LatLng(point.latitude, point.longitude))
                        .title("Location touched");    
            }
        }
    });

这将每次创建一个标记，如果您想替换它，只需在添加另一个标记之前清除其他标记。

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