【发布时间】：2020-10-25 23:04:07
【问题描述】：
我正在尝试设置该位置的纬度和经度，以便使用 API 获取天气信息。
当我运行应用程序时，我没有收到任何错误，但位置是 0.0、0.0。应用内显示默认位置。
我已确定我也在检查/请求位置许可。
这是 Kotlin 中的代码。我已经实现了'com.google.android.gms:play-services-location:17.1.0，在gradle中添加了kotlin-android-extensions，并添加了粗略、精细的位置权限和互联网权限。
这是 MainActivity.kt 中我的位置部分
@SuppressLint("MissingPermission")
private fun getLastLocation() {
if(CheckPermission()){
if(isLocationEnabled()){
fusedLocationProviderClient.lastLocation.addOnCompleteListener{task ->
var location = task.result
if(location == null){
getNewLocation()
}else {
locationResult = location
}
}
}else{
Toast.makeText(this, "Location service not enabled", Toast.LENGTH_SHORT).show()
}
}else{
RequestPermission()
}
}
private fun CheckPermission() : Boolean {
if( (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED)
|| (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) ){
return true
}
return false
}
private fun RequestPermission() {
ActivityCompat.requestPermissions(
this,
arrayOf(
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION
), PERMISSION_ID
)
}
private fun isLocationEnabled() : Boolean{
var locationManager = getSystemService(Context.LOCATION_SERVICE) as LocationManager
return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER) || locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)
}
override fun onRequestPermissionsResult(
requestCode: Int,
permissions: Array<out String>,
grantResults: IntArray
) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
if (requestCode == PERMISSION_ID){
if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED){
Log.d(TAG, "Permission granted")
}
}
}
@SuppressLint("MissingPermission")
private fun getNewLocation(){
locationRequest = LocationRequest()
locationRequest.priority = LocationRequest.PRIORITY_HIGH_ACCURACY
locationRequest.interval = 0
locationRequest.fastestInterval = 0
locationRequest.numUpdates = 2
fusedLocationProviderClient!!.requestLocationUpdates(
locationRequest, locationCallback, null
)
}
private val locationCallback = object : LocationCallback() {
override fun onLocationResult(p0: LocationResult?){
var lastLocation = p0?.lastLocation
if (lastLocation != null) {
locationResult = lastLocation
}
}
}
MainActivity.kt -- 已满
package <censored>.weatherapp
import android.Manifest
import android.annotation.SuppressLint
import android.content.Context
import android.content.pm.PackageManager
import android.location.Location
import android.location.LocationManager
import android.os.AsyncTask
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.view.View
import android.widget.ProgressBar
import android.widget.RelativeLayout
import android.widget.TextView
import android.widget.Toast
import androidx.core.app.ActivityCompat
import com.google.android.gms.location.*
import com.squareup.picasso.Picasso
import kotlinx.android.synthetic.main.activity_main.*
import org.json.JSONObject
import java.lang.Exception
import java.net.URL
import java.text.SimpleDateFormat
import java.util.*
class MainActivity : AppCompatActivity() {
companion object {
val API : String = "<censored>"
private var PERMISSION_ID : Int = 1000
val TAG = "MainActivity"
}
lateinit var fusedLocationProviderClient: FusedLocationProviderClient
lateinit var locationRequest : LocationRequest
lateinit var locationResult : Location
var latitude : Double = 0.0
var longitude : Double = 0.0
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this)
getLastLocation()
weatherTask().execute()
}
inner class weatherTask() : AsyncTask<String, Void, String>() {
override fun onPreExecute() {
super.onPreExecute()
//Showing the ProgressBar, making the main design gone
findViewById<ProgressBar>(R.id.loader).visibility = View.VISIBLE
findViewById<RelativeLayout>(R.id.mainContainer).visibility = View.GONE
}
override fun doInBackground(vararg params: String?): String? {
latitude = locationResult.latitude
longitude = locationResult.longitude
Log.d(TAG, "$latitude , $longitude")
var response : String?
try{
response = URL("https://api.openweathermap.org/data/2.5/weather?lat=$latitude&lon=$longitude&units=metric&appid=$API")
.readText(Charsets.UTF_8)
}catch (e: Exception){
response = null
}
return response
}
override fun onPostExecute(result: String?) {
super.onPostExecute(result)
try {
// Extracting JSON returns from the API
val jsonObj = JSONObject(result)
val main = jsonObj.getJSONObject("main")
val sys = jsonObj.getJSONObject("sys")
val wind = jsonObj.getJSONObject("wind")
val weather = jsonObj.getJSONArray("weather").getJSONObject(0)
val updatedAt:Long = jsonObj.getLong("dt")
val updatedAtText = "Updated at: "+ SimpleDateFormat("dd/MM/yyyy H:mm ", Locale.ENGLISH).format(Date(updatedAt*1000))
val temp = main.getDouble("temp").toInt().toString()
val tempMin = main.getDouble("temp_min").toInt().toString()
val tempMax = main.getDouble("temp_max").toInt().toString()
val tempText = "$temp°C"
val tempMinText = "Min Temp: $tempMin°C"
val tempMaxText = "Max Temp: $tempMax°C"
val pressure = main.getString("pressure")
val humidity = main.getString("humidity")
val sunrise:Long = sys.getLong("sunrise")
val sunset:Long = sys.getLong("sunset")
val windSpeed = wind.getDouble("speed").toInt()
val weatherDescription = weather.getString("description")
val address = jsonObj.getString("name")+", "+sys.getString("country")
val icon = weather.getString("icon")
val conditionUrl = "https://openweathermap.org/img/wn/$icon@2x.png"
// Populating extracted data into our views
Picasso.get().load(conditionUrl).into(condition_imageView)
findViewById<TextView>(R.id.address).text = address
findViewById<TextView>(R.id.updated_at).text = updatedAtText
findViewById<TextView>(R.id.status).text = weatherDescription.capitalize()
findViewById<TextView>(R.id.temp).text = tempText
findViewById<TextView>(R.id.temp_min).text = tempMinText
findViewById<TextView>(R.id.temp_max).text = tempMaxText
findViewById<TextView>(R.id.sunrise).text = SimpleDateFormat("HH:mm", Locale.ENGLISH).format(Date(sunrise * 1000))
findViewById<TextView>(R.id.sunset).text = SimpleDateFormat("HH:mm", Locale.ENGLISH).format(Date(sunset * 1000))
findViewById<TextView>(R.id.wind).text = "$windSpeed km/h"
findViewById<TextView>(R.id.pressure).text = "$pressure mb"
findViewById<TextView>(R.id.humidity).text = "$humidity %"
// Views populated, hiding the loader, showing the main design
findViewById<ProgressBar>(R.id.loader).visibility = View.GONE
findViewById<RelativeLayout>(R.id.mainContainer).visibility = View.VISIBLE
}
catch (e: Exception){
findViewById<ProgressBar>(R.id.loader).visibility = View.GONE
findViewById<TextView>(R.id.errorText).visibility = View.VISIBLE
}
}
}
@SuppressLint("MissingPermission")
private fun getLastLocation() {
if(CheckPermission()){
if(isLocationEnabled()){
fusedLocationProviderClient.lastLocation.addOnCompleteListener{task ->
var location = task.result
if(location == null){
getNewLocation()
}else {
locationResult = location
}
}
}else{
Toast.makeText(this, "Location service not enabled", Toast.LENGTH_SHORT).show()
}
}else{
RequestPermission()
}
}
private fun CheckPermission() : Boolean {
if( (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED)
|| (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) ){
return true
}
return false
}
private fun RequestPermission() {
ActivityCompat.requestPermissions(
this,
arrayOf(
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION
), PERMISSION_ID
)
}
private fun isLocationEnabled() : Boolean{
var locationManager = getSystemService(Context.LOCATION_SERVICE) as LocationManager
return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER) || locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)
}
override fun onRequestPermissionsResult(
requestCode: Int,
permissions: Array<out String>,
grantResults: IntArray
) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
if (requestCode == PERMISSION_ID){
if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED){
Log.d(TAG, "Permission granted")
}
}
}
@SuppressLint("MissingPermission")
private fun getNewLocation(){
locationRequest = LocationRequest()
locationRequest.priority = LocationRequest.PRIORITY_HIGH_ACCURACY
locationRequest.interval = 0
locationRequest.fastestInterval = 0
locationRequest.numUpdates = 2
fusedLocationProviderClient!!.requestLocationUpdates(
locationRequest, locationCallback, null
)
}
private val locationCallback = object : LocationCallback() {
override fun onLocationResult(p0: LocationResult?){
var lastLocation = p0?.lastLocation
if (lastLocation != null) {
locationResult = lastLocation
}
}
}
}
【问题讨论】：
标签： android kotlin geolocation