在 Google 地图 android 上放置点击侦听器

Question

我有一个带有地图片段的 android 应用程序。地图显示地点，我正在寻找一种方法来添加侦听器以在用户点击它们时获取该地点。

我找到的最相关的信息是建议为地图的点击添加一个侦听器，获取经度和纬度，然后根据该信息搜索地点。我以为我可以使用 FetchPlaceRequest 来做到这一点，但这似乎在实例化时首先需要一个 placeId。

我是否遗漏了一些非常基本的东西？

编辑

包含地图的片段的代码（我认为实现 PlaceSelectionlistener 就可以完成工作）

class MapFragment : Fragment(), OnMapReadyCallback, GoogleMap.OnMarkerClickListener,
PlaceSelectionListener, KoinComponent {

private lateinit var mapViewModel: MapViewModel
private lateinit var map: GoogleMap
private var fusedLocationClient: FusedLocationProviderClient? = null
private var locationRequest: LocationRequest? = null
private var locationCallback: LocationCallback? = null
private val permissionsUtils : PermissionsUtils by inject()
private val preferencesUtils : PreferencesUtils by inject { parametersOf(activity!!.applicationContext)}
private var root : View? = null
private val defaultZoom : Float = 16f

override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    mapViewModel = ViewModelProviders.of(this).get(MapViewModel::class.java)
    root = inflater.inflate(R.layout.fragment_map, container, false)

    if (canAccessLocation()) {
        initialiseMap(true)
    } else {
        val permissions = arrayOf(Manifest.permission.ACCESS_FINE_LOCATION)

        requestPermissions(permissions, PermissionRequests.FineLocation.value)
    }

    return root
}

override fun onMarkerClick(p0: Marker?) = false

override fun onMapReady(googleMap: GoogleMap) {
    map = googleMap

    map.setMapStyle(MapStyleOptions
        .loadRawResourceStyle(activity!!.applicationContext, preferencesUtils.mapMode))

    map.uiSettings.isZoomControlsEnabled = true

    if (canAccessLocation()){
        map.isMyLocationEnabled = true
        map.uiSettings.isMyLocationButtonEnabled = true
    }

    map.setOnMarkerClickListener(this)
}

override fun onRequestPermissionsResult(requestCode: Int,
                                        permissions: Array<String>, grantResults: IntArray) {
    when (requestCode) {

        PermissionRequests.FineLocation.value -> {
            val permissionGranted = grantResults.isNotEmpty()
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED

            initialiseMap(permissionGranted)
        }
    }
}

override fun onPause() {
    super.onPause()
    fusedLocationClient?.removeLocationUpdates(locationCallback)
}

override fun onResume() {
    super.onResume()

    requestLocationUpdates()
}

override fun onPlaceSelected(status: Place) {
    val toast = Toast.makeText(activity!!.applicationContext,""+ status!!.name + status!!.latLng, Toast.LENGTH_LONG)
    toast.setGravity(Gravity.TOP, 0, 0)
    toast.show()
}

override fun onError(status: Status) {
    Toast.makeText(activity!!.applicationContext,"" + status.toString(), Toast.LENGTH_LONG)
        .show()
}

private fun initialiseMap(withLocation: Boolean) {
    val mapFragment = childFragmentManager.findFragmentById(R.id.map) as SupportMapFragment

    mapFragment.getMapAsync(this)

    if (!withLocation) {
        return
    }

    requestLocationUpdates()
}

private fun requestLocationUpdates() {
    if (fusedLocationClient == null) {
        fusedLocationClient = LocationServices.getFusedLocationProviderClient(activity!!.applicationContext)
    }

    locationCallback = object : LocationCallback() {
        override fun onLocationResult(locationResult: LocationResult) {
            val locationList = locationResult.locations

            if (locationList.size > 0) {
                val location = locationList[locationList.size - 1]
                val latLng = LatLng(location.latitude, location.longitude)

                map.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, defaultZoom))
            }
        }
    }

    fusedLocationClient?.requestLocationUpdates(locationRequest, locationCallback, Looper.myLooper())

    locationRequest = LocationRequest()
    locationRequest?.interval = 1800000
    locationRequest?.fastestInterval = 1800000
    locationRequest?.priority = LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY

    fusedLocationClient?.lastLocation?.addOnCompleteListener(Activity()) { task ->
            if (task.isSuccessful && task.result != null) {
                val latLong = LatLng(task.result!!.latitude, task.result!!.longitude)
                map.moveCamera(CameraUpdateFactory.newLatLngZoom(latLong, defaultZoom))
            }
        }
}

private fun canAccessLocation(): Boolean {
    return permissionsUtils.hasPermission(activity!!.applicationContext, Manifest.permission.ACCESS_FINE_LOCATION)
}
}

Answer 1

因为您无法管理显示在 MapView (MapFragment) 上的地点，而且它的标记不可点击（且可自定义）恕我直言，更好的方法是通过隐藏 "default" 地点标记Google Maps styling like in answer of Jozef:

Create JSON file src\main\res\raw\map_style.json like this:

[
  {
    featureType: "poi",
    elementType: "labels",
    stylers: [
      {
        visibility: "off"
      }
    ]
  }
]

Add map style to your GoogleMap

googleMap.setMapStyle(MapStyleOptions.loadRawResourceStyle(getContext(), R.raw.map_style));

然后 - 通过 Place Search from Google Places API URL 请求获取附近的地点：

https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=<LAT_LNG>&types=point_of_interest&radius=<RADIUS_IN_METERS>&sensor=false&key=<YOUR_APP_KEY>

对其进行解析并以编程方式在地图上显示所需位置作为可自定义和可点击的 Google 地图标记。该方法不仅允许您通过默认 onMarkerClick() 处理标记点击，还可以管理地点的数量和类型、标记图标设计等。也无需在每次用户点击时创建请求并处理其响应在地图上。

注意！ Nearby URL request returns only 20 places, load more data you should use string value from next_page_token tag of response and pass it via pagetoken parameter for next request:

https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=<LAT_LNG>&types=point_of_interest&radius=<RADIUS_IN_METERS>&sensor=false&key=<YOUR_APP_KEY>&pagetoken=<TOKEN_FOR_NEXT_PAGE_FROM_next_page_token_TAG_OF_RESPONSE>

在 Google 地图 android 上放置点击侦听器

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