Kotlin中Google地图定位权限缺失问题求助

你的核心问题是权限请求后没有处理授权回调——调用requestPermissions后直接return，当用户点击允许权限时，代码不会自动重新执行setUpMap里的定位逻辑，导致后续调用isMyLocationEnabled和getLastLocation时依然处于无权限状态。

解决步骤： #

1. 添加权限授权回调处理
   在MapActivity中重写onRequestPermissionsResult方法，当用户授权成功后，重新执行定位逻辑：

   override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
       super.onRequestPermissionsResult(requestCode, permissions, grantResults)
       if (requestCode == LOCATION_PERMISSION_REQUEST_CODE) {
           // 权限授予成功，重新初始化地图定位
           if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
               setUpMap()
           }
       }
   }
   

2. 优化权限判断逻辑（可选）
   同时检查两种定位权限，提升兼容性：

   private fun setUpMap(){
       val hasFineLocPerm = ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
       val hasCoarseLocPerm = ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED
   
       if (!hasFineLocPerm && !hasCoarseLocPerm){
           ActivityCompat.requestPermissions(this, 
               arrayOf(android.Manifest.permission.ACCESS_FINE_LOCATION, android.Manifest.permission.ACCESS_COARSE_LOCATION), 
               LOCATION_PERMISSION_REQUEST_CODE)
           return
       }
   
       // 后续地图定位逻辑
       mMap.isMyLocationEnabled = true
       mMap.mapType = GoogleMap.MAP_TYPE_NORMAL
   
       fusedLocationClient.lastLocation.addOnSuccessListener { location ->
           if (location != null){
               lastLocation = location
               val currentLatLng = LatLng(location.latitude, location.longitude)
               placeMarkerOnMap(currentLatLng)
               mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(currentLatLng, 12f))
           }
       }
   }
   

3. Manifest配置确认
   你的AndroidManifest.xml权限配置完全正确，已经添加了ACCESS_FINE_LOCATION和ACCESS_COARSE_LOCATION，无需修改。如果应用目标SDK为31（Android 12）及以上且需要后台持续定位，才需额外添加ACCESS_BACKGROUND_LOCATION权限，当前场景不需要。

修改后的完整MapActivity代码： #

import android.Manifest
import android.content.pm.PackageManager
import android.location.Location
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import androidx.core.app.ActivityCompat
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
import com.google.android.gms.maps.model.MarkerOptions
import com.yourpackage.name.databinding.ActivityMapsBinding

class MapsActivity : AppCompatActivity(), OnMapReadyCallback, GoogleMap.OnMarkerClickListener {

    private lateinit var mMap: GoogleMap
    private lateinit var binding: ActivityMapsBinding
    private lateinit var fusedLocationClient: FusedLocationProviderClient
    private lateinit var lastLocation: Location

    companion object {
        private const val LOCATION_PERMISSION_REQUEST_CODE = 1
    }

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

        binding = ActivityMapsBinding.inflate(layoutInflater)
        setContentView(binding.root)

        val mapFragment = supportFragmentManager
            .findFragmentById(R.id.map) as SupportMapFragment
        mapFragment.getMapAsync(this)
        fusedLocationClient = LocationServices.getFusedLocationProviderClient(this)
    }

    override fun onMapReady(googleMap: GoogleMap) {
        mMap = googleMap

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

        setUpMap()
    }

    override fun onMarkerClick(p0: Marker): Boolean = false

    private fun setUpMap(){
        val hasFineLocPerm = ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
        val hasCoarseLocPerm = ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED

        if (!hasFineLocPerm && !hasCoarseLocPerm){
            ActivityCompat.requestPermissions(this,
                arrayOf(Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION),
                LOCATION_PERMISSION_REQUEST_CODE)
            return
        }

        mMap.isMyLocationEnabled = true
        mMap.mapType = GoogleMap.MAP_TYPE_NORMAL

        fusedLocationClient.lastLocation.addOnSuccessListener { location ->
            if (location != null){
                lastLocation = location
                val currentLatLng = LatLng(location.latitude, location.longitude)
                placeMarkerOnMap(currentLatLng)
                mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(currentLatLng, 12f))
            } else {
                Toast.makeText(this, "无法获取当前位置", Toast.LENGTH_SHORT).show()
            }
        }
    }

    private fun placeMarkerOnMap(currentLatLng: LatLng) {
        val markerOptions = MarkerOptions().position(currentLatLng).title("当前位置")
        mMap.addMarker(markerOptions)
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if (requestCode == LOCATION_PERMISSION_REQUEST_CODE) {
            if (grantResults.isNotEmpty() && grantResults.any { it == PackageManager.PERMISSION_GRANTED }) {
                setUpMap()
            } else {
                Toast.makeText(this, "需要定位权限才能显示当前位置", Toast.LENGTH_SHORT).show()
            }
        }
    }
}

注意事项： #

• 建议在真实设备上测试定位功能，部分模拟器可能无法获取有效定位数据
• 如果用户拒绝权限并勾选「不再询问」，可添加逻辑引导用户前往应用设置开启权限

内容的提问来源于stack exchange，提问作者Pragyanshree Das