标记未显示在Android的地图上

Question

我刚刚创建了一个谷歌地图片段。标记悉尼没有显示。。。我忘了添加什么了吗？我添加了我的谷歌地图密钥

class fragment_map : Fragment() {
private val callback = OnMapReadyCallback { googleMap ->
/**
* 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.
*/
val sydney = LatLng(-34.0, 151.0)
googleMap.addMarker(MarkerOptions().position(sydney).title("Marker in Sydney"))
googleMap.moveCamera(CameraUpdateFactory.newLatLng(sydney))
}
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
return inflater.inflate(R.layout.fragment_map, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
val mapFragment = childFragmentManager.findFragmentById(R.id.map) as SupportMapFragment?
mapFragment?.getMapAsync(callback)
}
}

Answer 1

您的onMapReady似乎不完整。也许试试这个？

class fragment_map : Fragment() {
private val callback = OnMapReadyCallback { googleMap ->
override fun onMapReady(googleMap: GoogleMap) {
mMap = googleMap
val boundsBuilder = LatLngBounds.Builder()
val sydney = LatLng(-34.0, 151.0)
boundsBuilder.include(latlng)
Map.addMarker(MarkerOptions().position(latlng).title("Sydney"))
mMap.moveCamera(CameraUpdateFactory.newLatLngBounds(boundsBuilder.build(), 1000, 1000, 0))
}

}
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
return inflater.inflate(R.layout.fragment_map, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
val mapFragment = childFragmentManager.findFragmentById(R.id.map) as SupportMapFragment?
mapFragment?.getMapAsync(callback)
}
}