【发布时间】：2018-11-04 15:58:27
【问题描述】：
伙计们，我正在尝试获取用户位置，但出现了问题，当我运行我的应用程序时，没有播放器图标并且位置错误 - 它仍然显示 lat = 0.0, lon = 0.0。我不使用模拟器，我在手机上测试应用程序（如果重要，Android 4.4.2）。请看一下我的代码，也许我看不到错误。先感谢您！
class MapsActivity : FragmentActivity(), OnMapReadyCallback {
private var mMap: GoogleMap? = null
private val USER_LOCATION_REQUEST_CODE = 1000
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_maps)
// 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)
requestLocationPermission()
}
/**
* 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) {
mMap = googleMap
}
//ask permission
private fun requestLocationPermission() {
if (Build.VERSION.SDK_INT >= 23) {
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) !=
PackageManager.PERMISSION_GRANTED) {
requestPermissions(
arrayOf(android.Manifest.permission.ACCESS_FINE_LOCATION),
USER_LOCATION_REQUEST_CODE
)
}
}
}
fun GetPlayerLocation() {
Toast.makeText(this, "User location access on", Toast.LENGTH_LONG).show()
var playerLocation = PlayerLocationListener()
var locationManager = getSystemService(Context.LOCATION_SERVICE) as LocationManager
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3, 3f, playerLocation)
var mythread = myThread()
mythread.start()
}
override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
when (requestCode) {
USER_LOCATION_REQUEST_CODE -> {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
GetPlayerLocation()
} else {
Toast.makeText(this, "We cannot access to your location", Toast.LENGTH_LONG).show()
}
}
}
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
}
var location: Location? = null
// Get player location
inner class PlayerLocationListener : LocationListener {
constructor() {
location = Location("Start")
location!!.latitude = 0.0
location!!.longitude = 0.0
}
override fun onStatusChanged(p0: String?, p1: Int, p2: Bundle?) {
}
override fun onProviderEnabled(p0: String?) {
}
override fun onProviderDisabled(p0: String?) {
}
override fun onLocationChanged(p0: Location?) {
location = p0
}
}
inner class myThread : Thread {
constructor() : super(){
}
override fun run() {
while (true) {
try {
runOnUiThread {
mMap!!.clear()
val sydney = LatLng(location!!.latitude, location!!.longitude)
mMap!!.addMarker(
MarkerOptions().position(sydney).title("Hi!")
.snippet("Let's go!")
.icon(BitmapDescriptorFactory.fromResource(R.drawable.player)))
mMap!!.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney, 14f))
}
Thread.sleep(1000)
} catch (ex: Exception) {
}
}
}
}
}
`
【问题讨论】：
标签： android google-maps kotlin google-api location