在android中获取位置（回调问题）

我正在尝试获取用户的新位置。 这是我目前掌握的代码：

 private fun getNewLocation() {
    Log.d(TAG, "getNewLocation: started")
    locationRequest = LocationRequest()
    locationRequest.priority = LocationRequest.PRIORITY_HIGH_ACCURACY
    locationRequest.interval = 0
    locationRequest.fastestInterval = 0
    locationRequest.numUpdates = 1
    fusedLocationProviderClient.requestLocationUpdates(
        locationRequest,
        locationCallback,
        Looper.myLooper()
    )
    Log.d(TAG, "getNewLocation: finished")
}

private val locationCallback = object : LocationCallback() {
    override fun onLocationResult(locationResult: LocationResult) {
        Log.d(TAG, "locationCallback: onLocationResult started")
        val newLocation = locationResult.lastLocation
        Log.d(TAG, "locationCallback: before setting new data latitude = $latitude, longitude = $longitude")
        // set new location
        latitude = newLocation.latitude.toString()
        longitude = newLocation.longitude.toString()
        locationName = getLocationName(newLocation.latitude, newLocation.longitude)
        Log.d(TAG, "getLastLocation: new location were set latitude = $latitude, longitude = $longitude")
        requestAPI()
    }
}

出于某种原因，当我在物理设备上测试它时，

getNewLocation（）

不会调用

onLocationResult

因此，我的日志如下所示：

D/MainActivity: getNewLocation: started
D/MainActivity: getNewLocation: finished

val newLocation = locationResult.locations[0]

而不是：

D/MainActivity: getNewLocation: started
D/MainActivity: getNewLocation: finished
D/MainActivity: locationCallback: onLocationResult started
D/MainActivity: locationCallback: latitude = 64.49273, longitude = 40.596625

我还尝试在

locationCallback

中设置

newLocation

，如下所示：

D/MainActivity: getNewLocation: started
D/MainActivity: getNewLocation: finished

val newLocation = locationResult.locations[0]

但是我得到了相同的结果，因为问题是

getNewLocation（）

不调用

onLocationResult

有人能帮我理解为什么会发生这种情况，我该如何解决

---

谢谢

在请求新位置之前，您应该检查位置设置

private suspend fun checkSettings(locationRequest: LocationRequest) {
    val settingsRequest = LocationSettingsRequest.Builder()
        .addLocationRequest(locationRequest)
        .build()
    try {
        LocationServices
            .getSettingsClient(this)
            .checkLocationSettings(settingsRequest)
            .await()
        // location is turned on
    } catch (e: ResolvableApiException) {
        // location is turned off. Prompt the user to enable it
        e.startResolutionForResult(this, CODE)
    }
}

LocationServices
    .getFusedLocationProviderClient(this)
    .getCurrentLocation(LocationRequest.PRIORITY_HIGH_ACCURACY, null)

此外，如果您使用的是最新版本的play services location，则有一种获取新位置的简单方法

private suspend fun checkSettings(locationRequest: LocationRequest) {
    val settingsRequest = LocationSettingsRequest.Builder()
        .addLocationRequest(locationRequest)
        .build()
    try {
        LocationServices
            .getSettingsClient(this)
            .checkLocationSettings(settingsRequest)
            .await()
        // location is turned on
    } catch (e: ResolvableApiException) {
        // location is turned off. Prompt the user to enable it
        e.startResolutionForResult(this, CODE)
    }
}

LocationServices
    .getFusedLocationProviderClient(this)
    .getCurrentLocation(LocationRequest.PRIORITY_HIGH_ACCURACY, null)