如何在Android中从地图中获取当前位置

在我的应用程序中，我想使用地图框在我的应用程序中使用地图，我想在加载应用程序时显示当前位置。
我写了下面的代码，但当运行应用程序时，在logcat（非强制关闭）和未加载映射中显示错误
我的活动代码：

class AddressMapPage : BaseActivity(), LocationEngineListener {

    override var layoutId: Int = R.layout.activity_address_map_page
    override var context: Context = this
    private lateinit var mapirMap: MapirMap
    private lateinit var latLng: LatLng

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        //Hide status bar
        window.setFlags(
            WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN
        )

        (supportFragmentManager.findFragmentById(R.id.myMapView) as SupportMapFragment)
            .getMapAsync { mapirMap ->

                this@AddressMapPage.mapirMap = mapirMap

                imageView2.setOnClickListener {
                    latLng = mapirMap.cameraPosition.target
                    toast(latLng.toString())
                    Log.e("TalAndLog", latLng.toString())
                }

                getLocationPermission()
            }
    }

    private fun getLocationPermission() {
        KotlinPermissions.with(this)
            .permissions(Manifest.permission.ACCESS_FINE_LOCATION)
            .onAccepted {
                currentLocation()
            }
            .onDenied {
                toast("Not allowed error message")
            }
            .onForeverDenied {
                toast("Not allowed error message")
            }
            .ask()
    }

    private fun currentLocation() {
        val component = mapirMap.locationComponent
        component.activateLocationComponent(context)
        component.isLocationComponentEnabled = true
        if (component.locationEngine != null) {
            component.locationEngine!!.addLocationEngineListener(this)
        }
        mapirMap.animateCamera(
            CameraUpdateFactory
                .newLatLngZoom(
                    LatLng(
                        component.lastKnownLocation!!.latitude,
                        component.lastKnownLocation!!.longitude
                    ), 14.0
                )
        )
    }

    override fun onLocationChanged(location: Location?) {
        if (location != null)
            mapirMap.animateCamera(
                CameraUpdateFactory.newLatLngZoom(
                    LatLng(
                        location.latitude,
                        location.longitude
                    ), 14.0
                )
            )
    }

    override fun onConnected() {
    }
}

kotlin.KotlinNullPointerException
        at com.app.ui.address.map.AddressMapPage.currentLocation(AddressMapPage.kt:77)
        at com.app.ui.address.map.AddressMapPage.access$currentLocation(AddressMapPage.kt:20)
        at com.app.ui.address.map.AddressMapPage$getLocationPermission$1.invoke(AddressMapPage.kt:55)
        at com.app.ui.address.map.AddressMapPage$getLocationPermission$1.invoke(AddressMapPage.kt:20)
        at com.kotlinpermissions.KotlinPermissions$PermissionCore$onAccepted$1.onResult(KotlinPermissions.kt:56)
        at com.kotlinpermissions.KotlinPermissions$PermissionCore.onReceivedPermissionResult$kotlin_permissions_release(KotlinPermissions.kt:36)
        at com.kotlinpermissions.KotlinPermissions$PermissionCore.onAcceptedPermission(KotlinPermissions.kt:132)
        at com.kotlinpermissions.KotlinPermissions$PermissionCore.ask(KotlinPermissions.kt:107)
        at com.app.ui.address.map.AddressMapPage.getLocationPermission(AddressMapPage.kt:63)
        at com.app.ui.address.map.AddressMapPage.access$getLocationPermission(AddressMapPage.kt:20)
        at com.app.ui.address.map.AddressMapPage$onCreate$1.onMapReady(AddressMapPage.kt:47)
        at ir.map.sdk_map.maps.SupportMapFragment.onMapReady(SupportMapFragment.java:124)
        at ir.map.sdk_map.maps.MapView$MapCallback.onMapReady(MapView.java:1663)
        at ir.map.sdk_map.maps.MapView$MapCallback.onDidFinishLoadingStyle(MapView.java:1701)
        at ir.map.sdk_map.maps.MapChangeReceiver.onDidFinishLoadingStyle(MapChangeReceiver.java:195)
        at ir.map.sdk_map.maps.NativeMapView.onDidFinishLoadingStyle(NativeMapView.java:995)
        at android.os.MessageQueue.nativePollOnce(Native Method)

Logcat错误：

class AddressMapPage : BaseActivity(), LocationEngineListener {

    override var layoutId: Int = R.layout.activity_address_map_page
    override var context: Context = this
    private lateinit var mapirMap: MapirMap
    private lateinit var latLng: LatLng

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        //Hide status bar
        window.setFlags(
            WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN
        )

        (supportFragmentManager.findFragmentById(R.id.myMapView) as SupportMapFragment)
            .getMapAsync { mapirMap ->

                this@AddressMapPage.mapirMap = mapirMap

                imageView2.setOnClickListener {
                    latLng = mapirMap.cameraPosition.target
                    toast(latLng.toString())
                    Log.e("TalAndLog", latLng.toString())
                }

                getLocationPermission()
            }
    }

    private fun getLocationPermission() {
        KotlinPermissions.with(this)
            .permissions(Manifest.permission.ACCESS_FINE_LOCATION)
            .onAccepted {
                currentLocation()
            }
            .onDenied {
                toast("Not allowed error message")
            }
            .onForeverDenied {
                toast("Not allowed error message")
            }
            .ask()
    }

    private fun currentLocation() {
        val component = mapirMap.locationComponent
        component.activateLocationComponent(context)
        component.isLocationComponentEnabled = true
        if (component.locationEngine != null) {
            component.locationEngine!!.addLocationEngineListener(this)
        }
        mapirMap.animateCamera(
            CameraUpdateFactory
                .newLatLngZoom(
                    LatLng(
                        component.lastKnownLocation!!.latitude,
                        component.lastKnownLocation!!.longitude
                    ), 14.0
                )
        )
    }

    override fun onLocationChanged(location: Location?) {
        if (location != null)
            mapirMap.animateCamera(
                CameraUpdateFactory.newLatLngZoom(
                    LatLng(
                        location.latitude,
                        location.longitude
                    ), 14.0
                )
            )
    }

    override fun onConnected() {
    }
}

kotlin.KotlinNullPointerException
        at com.app.ui.address.map.AddressMapPage.currentLocation(AddressMapPage.kt:77)
        at com.app.ui.address.map.AddressMapPage.access$currentLocation(AddressMapPage.kt:20)
        at com.app.ui.address.map.AddressMapPage$getLocationPermission$1.invoke(AddressMapPage.kt:55)
        at com.app.ui.address.map.AddressMapPage$getLocationPermission$1.invoke(AddressMapPage.kt:20)
        at com.kotlinpermissions.KotlinPermissions$PermissionCore$onAccepted$1.onResult(KotlinPermissions.kt:56)
        at com.kotlinpermissions.KotlinPermissions$PermissionCore.onReceivedPermissionResult$kotlin_permissions_release(KotlinPermissions.kt:36)
        at com.kotlinpermissions.KotlinPermissions$PermissionCore.onAcceptedPermission(KotlinPermissions.kt:132)
        at com.kotlinpermissions.KotlinPermissions$PermissionCore.ask(KotlinPermissions.kt:107)
        at com.app.ui.address.map.AddressMapPage.getLocationPermission(AddressMapPage.kt:63)
        at com.app.ui.address.map.AddressMapPage.access$getLocationPermission(AddressMapPage.kt:20)
        at com.app.ui.address.map.AddressMapPage$onCreate$1.onMapReady(AddressMapPage.kt:47)
        at ir.map.sdk_map.maps.SupportMapFragment.onMapReady(SupportMapFragment.java:124)
        at ir.map.sdk_map.maps.MapView$MapCallback.onMapReady(MapView.java:1663)
        at ir.map.sdk_map.maps.MapView$MapCallback.onDidFinishLoadingStyle(MapView.java:1701)
        at ir.map.sdk_map.maps.MapChangeReceiver.onDidFinishLoadingStyle(MapChangeReceiver.java:195)
        at ir.map.sdk_map.maps.NativeMapView.onDidFinishLoadingStyle(NativeMapView.java:995)
        at android.os.MessageQueue.nativePollOnce(Native Method)

显示此行的错误：

组件。lastKnownLocation！！。纬度，

如何解决此问题？

来自Mapbox文档的介绍了在地图上显示用户位置的推荐方法

由于您正在使用Kotlin（

！！

），由于

组件.lastKnownLocation

为空，因此将引发

Kotlin.KotlinNullPointerException

。在链接的示例中不会出现此问题，因为在

onMapReady

回调中调用了

enableLocationComponent

方法。

enableLocationComponent

方法执行必要的设置，以便将

LocationComponent

实例与地图盒地图一起使用。

来自地图盒文档的显示了在地图上显示用户位置的推荐方法

由于您正在使用Kotlin（

！！

），由于

组件.lastKnownLocation

为空，因此将引发

Kotlin.KotlinNullPointerException

。在链接的示例中不会出现此问题，因为在

onMapReady

回调中调用了

enableLocationComponent

方法。

enableLocationComponent

方法执行必要的设置，以便将

LocationComponent

实例与Mapbox地图一起使用