当 map.isMyLocationEnabled = false 时，FusedLocations 不会发送位置更新。奇怪的行为

Posted 2023-04-14

【中文标题】当 map.isMyLocationEnabled = false 时，FusedLocations 不会发送位置更新。奇怪的行为

【英文标题】：FusedLocations doesn't send location updates when map.isMyLocationEnabled = false. Strange behaviour

【发布时间】：2020-07-16 20:50:36

【问题描述】：

我想添加一个自定义图像作为我的位置指示器。 隐藏蓝点的唯一方法是 setIsMyLocationEnabled = false。这样做也会以某种方式禁用来自 FusedLocation 的更新。我想知道这是有意为之还是只是一个错误？

Gradle -

implementation 'com.google.android.gms:play-services-maps:17.0.0'
implementation 'com.google.android.gms:play-services-location:17.0.0'

活动（删除不必要的代码）-

class MapsActivity : AppCompatActivity(), OnMapReadyCallback 

    private lateinit var mMap: GoogleMap
    override fun onCreate(savedInstanceState: Bundle?) 
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_maps)

        val mapFragment = supportFragmentManager
            .findFragmentById(R.id.map) as SupportMapFragment
        startLocationUpdate()
        mapFragment.getMapAsync(this)
    

    private var marker: Marker? = null
    private var lastLocation: Location? = null

    override fun onMapReady(googleMap: GoogleMap) 
        mMap = googleMap
        val sydney = LatLng(-34.0, 151.0)
        val icon = BitmapDescriptorFactory.fromResource(R.drawable.ic_location_indicator)
        val location = lastLocation?.let  LatLng(it.latitude, it.longitude)  ?: sydney
        val markerOpts = MarkerOptions().position(location).flat(true).anchor(0.5f, 0.5f)
            .icon(icon)
        marker = mMap.addMarker(markerOpts)
        val cameraPosition = CameraPosition.builder().zoom(17f).target(location).build()
        mMap.moveCamera(CameraUpdateFactory.newCameraPosition(cameraPosition))
        mMap.isMyLocationEnabled = false // disabling MyLocation here stops FusedLocation updates
        mMap.uiSettings.isMyLocationButtonEnabled = true
    


    fun startLocationUpdate() 
        val fusedLocationClient = LocationServices.getFusedLocationProviderClient(this)
        fusedLocationClient.lastLocation
            .addOnSuccessListener  location: Location? ->
                lastLocation = location
            

        val locationRequest = LocationRequest()
        locationRequest.fastestInterval = 1000
        locationRequest.smallestDisplacement = 0f
        fusedLocationClient.requestLocationUpdates(locationRequest, object :
            LocationCallback() 
            override fun onLocationResult(p0: LocationResult?) 
                // Never gets called when mMap.isMyLocationEnabled = false but works properly
                // if mMap.isMyLocationEnabled = true. 
                marker?.position = LatLng(p0.lastLocation.latitude, p0.lastLocation.longitude)
                val cameraPosition = CameraPosition.builder().target(latlng).zoom(17f).build()
                mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition))
            
        , Looper.getMainLooper())

    

布局-

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:map="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/map"
    android:name="com.google.android.gms.maps.SupportMapFragment"
    android:layout_
    android:layout_
    tools:context=".ui.temp.MapsActivity" />

【参考方案1】：

问题出在位置请求上。默认情况下，LocationRequest 的优先级较低，因此不会经常更新。

当设置mMap.isMyLocationEnabled = false 时，它采用默认的低优先级。只需添加 2 行即可解决问题。

locationRequest.priority = LocationRequest.PRIORITY_HIGH_ACCURACY locationRequest.interval = 5000