标记未在 Android 中的地图上显示

Posted 2023-02-23

【中文标题】标记未在 Android 中的地图上显示

【英文标题】：Marker not showing on map in Android

【发布时间】：2021-12-18 21:48:05

【问题描述】：

我刚刚创建了一个 Google 地图片段。标记 sydney 没有显示...我忘了添加什么吗？我已经添加了我的 Google 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)
    

【参考方案1】：

您的 onMapReady 似乎不完整。试试这个吧？

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)
    

  

【讨论】：

我需要创建一个新函数吗？因为它似乎不起作用。

尝试按照本教程进行操作 -> https://www.youtube.com/watch?v=m_H3JuybsJ0 了解发生了什么。但本质上，您需要在代码中具有该功能。您可以将其复制并粘贴到您的 onCreate 函数上方。我将编辑我的答案，以反映它。