Google maps 如何在科特林的谷歌地图中记录步行情况

我正试图在kotlin使用google maps API跟踪一次步行

现在我只得到最后一个已知的当前位置（实际上不是真实的当前位置）

这是我的地图活动代码：

import android.content.pm.PackageManager
import android.location.Location
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import com.example.macc_project.R
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.LatLng
import com.google.android.gms.maps.model.Marker

class MapsActivity : AppCompatActivity(), OnMapReadyCallback, GoogleMap.OnMarkerClickListener {
    override fun onMarkerClick(p0: Marker?): Boolean {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
    }

    companion object {
        private const val LOCATION_PERMISSION_REQUEST_CODE = 1
    }

    private lateinit var map: GoogleMap
    private lateinit var lastLocation: Location
    private lateinit var fusedLocationClient: FusedLocationProviderClient



    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_maps_google)
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        val mapFragment = supportFragmentManager
            .findFragmentById(R.id.map) as SupportMapFragment
        mapFragment.getMapAsync(this)
        fusedLocationClient = LocationServices.getFusedLocationProviderClient(this)



    }

    /**
     * Manipulates the map once available.
     * This callback is triggered when the map is ready to be used.
     * This is where we can add markers or lines, add listeners or move the camera. In this case,
     * we just add a marker near Sydney, Australia.
     * If Google Play services is not installed on the device, the user will be prompted to install
     * it inside the SupportMapFragment. This method will only be triggered once the user has
     * installed Google Play services and returned to the app.
     */
    override fun onMapReady(googleMap: GoogleMap) {
        map = googleMap

        map.uiSettings.isZoomControlsEnabled = true
        map.setOnMarkerClickListener(this)

        setUpMap()
    }



    private fun setUpMap() {


        if (ActivityCompat.checkSelfPermission(this,
                android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this,
                arrayOf(android.Manifest.permission.ACCESS_FINE_LOCATION), LOCATION_PERMISSION_REQUEST_CODE)
            return
        }

        // 1
        map.isMyLocationEnabled = true

        // 2
        fusedLocationClient.lastLocation.addOnSuccessListener(this) { location ->
            // Got last known location. In some rare situations this can be null.
            // 3
            if (location != null) {
                lastLocation = location
                val currentLatLng = LatLng(location.latitude, location.longitude)
                map.animateCamera(CameraUpdateFactory.newLatLngZoom(currentLatLng, 12f))
            }
        }


    }
}

---

我该如何记录我的整个行走过程？例如，在我的行走之后画一条蓝线，从初始状态到最终状态

即使用户离开应用程序或关闭屏幕，您是否希望它继续跟踪移动？@Tenfour04是我想要这个behaviour@Tenfour04我可以利用Google Api客户端和LocationListener作为链接吗？大约8年前，我制作了一个追踪位置的应用程序，所以我的知识已经过时了。我只是想提出总体战略。您需要一个前台服务来监控位置，这样当活动不在屏幕上时，您就不会错过位置点。我已经很长时间没有使用服务了，所以我不知道让服务与活动通信的推荐方法。但我认为在这种情况下，由于活动完成时不需要运行服务，所以可以使用AndroidViewModel实现启动服务，并在

onCleared（）

中结束服务。该服务可以将位置点添加到活动观察到的

MutableLiveData

。