FusedLocation 不会触发 android api <= 21 的 locationcallback

Posted 2023-04-14

【中文标题】FusedLocation 不会触发 android api <= 21 的 locationcallback

【英文标题】：FusedLocation not trigger locationcallback for android api <= 21

【发布时间】：2020-10-16 22:27:24

【问题描述】：

所以我想从设备获取纬度和经度，但是当我在 android Lollipop 或 API 22 上构建我的应用程序时，我没有得到当前的纬度和经度。这是因为android许可还是什么？这是我的代码

我正在使用播放服务位置版本：

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

LocationUser.kt

class LocationUser(context: Context) 
    private var fusedLocation: FusedLocationProviderClient? = null
    private val INTERVAL: Long = 300000
    private val FASTEST_INTERVAL: Long = 300000
    private val REQUEST_LOCATION_PERMISSION = 1
    lateinit var locationRequest: LocationRequest
    private lateinit var lastLocation: Location


    fun startLocationUpdates(context: Context) 
        Log.d("LOCATION UPDATE", "started location update")
        locationRequest = LocationRequest()
        locationRequest.priority = LocationRequest.PRIORITY_HIGH_ACCURACY
        locationRequest.interval = INTERVAL
        locationRequest.fastestInterval = FASTEST_INTERVAL

        val builder = LocationSettingsRequest.Builder()
        builder.addLocationRequest(locationRequest)
        val locationSettingsRequest = builder.build()

        val settingsClient = LocationServices.getSettingsClient(context)
        settingsClient.checkLocationSettings(locationSettingsRequest)

        fusedLocation = LocationServices.getFusedLocationProviderClient(context)
        if (ActivityCompat.checkSelfPermission(
                context,
                android.Manifest.permission.ACCESS_FINE_LOCATION
            ) != PackageManager.PERMISSION_GRANTED &&
            ActivityCompat.checkSelfPermission(
                context,
                android.Manifest.permission.ACCESS_COARSE_LOCATION
            ) != PackageManager.PERMISSION_GRANTED
        ) 
            return
        
        fusedLocation!!.requestLocationUpdates(locationRequest, locationCallback, Looper.myLooper())
        Log.d("LOCATION UPDATE", "end location update")
    

    fun isPermissionGranted(context: Context): Boolean 
        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) 
            if (context.checkSelfPermission(android.Manifest.permission.ACCESS_FINE_LOCATION) ==
                PackageManager.PERMISSION_GRANTED
            ) 
                true
             else 
                ActivityCompat.requestPermissions(
                    context as Activity, arrayOf(android.Manifest.permission.ACCESS_FINE_LOCATION),
                    REQUEST_LOCATION_PERMISSION
                )
                false
            
         else 
            true
        
    

    private val locationCallback = object : LocationCallback() 
        override fun onLocationResult(locationResult: LocationResult) 
            locationResult.lastLocation
            onLocationChanged(context, locationResult.lastLocation)
            super.onLocationResult(locationResult)
        
    

    fun onLocationChanged(context: Context, location: Location) 
        Log.d("UWUWU", "location changed")
        lastLocation = location
        val geocoder = Geocoder(context, Locale.getDefault())
        val latitude = lastLocation.latitude
        val longitude = lastLocation.longitude
        val sharedPref = SharedPref(context)
        Log.d("latitude", latitude.toString())
        Log.d("longitude", longitude.toString())
        sharedPref.saveStringPref("latitude_user", latitude.toString())
        sharedPref.saveStringPref("longitude_user", longitude.toString())

        try 
            val addresses: List<Address> = geocoder.getFromLocation(latitude, longitude, 1)
            val namaKota = addresses[0].subAdminArea
            val namaKecamatan = addresses[0].locality
            sharedPref.saveStringPref("alamat_user", "$namaKecamatan, $namaKota")
         catch (e: Exception) 
            e.localizedMessage
        
        Log.d("UWUWU", "location changed")

    

在活动中，我这样称呼班级

MainActivity.kt

class MainActivity : AppCompatActivity() 

    private val REQUEST_LOCATION_PERMISSION = 1
    private val REQUESTING_LOCATION_UPDATES_KEY = "requesting_location_update"
    private val  requestingLocationUpdates = true
    val locationUser = LocationUser(this)

    @SuppressLint("SimpleDateFormat", "SetTextI18n")
    override fun onCreate(savedInstanceState: Bundle?) 
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        ../
        val locationManager = getSystemService(Context.LOCATION_SERVICE) as LocationManager
        if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) 
            checkUserGPS()
        

        if(locationUser.isPermissionGranted(this))
            locationUser.startLocationUpdates(this)
        
        Log.d("GRANTED ?", locationUser.isPermissionGranted(this).toString())
    

    override fun onCreateOptionsMenu(menu: Menu?): Boolean 
        menuInflater.inflate(R.menu.menu_setting, menu)
        return true
    

    override fun onOptionsItemSelected(item: MenuItem): Boolean 
        if (item.itemId == R.id.menu_settings) 
            val intent = Intent(this, SettingsActivity::class.java)
            startActivity(intent)
            return true
        
        return super.onOptionsItemSelected(item)
    


    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) 
        if (requestCode == REQUEST_LOCATION_PERMISSION) 
            if (grantResults.contains(PackageManager.PERMISSION_GRANTED)) 
                Toast.makeText(this, "permission granted", Toast.LENGTH_SHORT).show()
            
        
    

    private fun checkUserGPS() 
        val dialog = AlertDialog.Builder(this)
        dialog.setMessage("GPS tidak aktif, apakah kamu ingin megaktifkannya?")
            .setCancelable(false)
            .setPositiveButton("iya")  _, which ->
                startActivityForResult(Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS), 11)
            
            .setNegativeButton("tidak")  dialog, _ ->
                dialog.cancel()
                finish()
            
            .create()
            .show()
    

    override fun onResume() 
        locationUser.startLocationUpdates(this)
        super.onResume()
    

当我看到日志时，我注意到在调用函数 startLocationUpdates 函数时未调用 onLocationChange 函数。这是因为许可还是什么，我正在遭受 *** 并得到这个问题，反之亦然，我注意到同样的事情是 locationcallback 没有被触发

FusedLocationProviderClient requestLocationUpdates doesn't trigger LocationCallBack for API 23 above

我现在很困惑

【参考方案1】：

如果至少有一个客户端连接到融合的位置提供程序，它将只维护后台位置。现在只打开定位服务并不能保证存储最后一个已知位置。

一旦第一个客户端连接，它将立即尝试获取位置。如果您的活动是第一个连接的客户端，并且在 onConnected() 中立即调用 getLastLocation()，则可能没有足够的时间让第一个位置到达..

我建议你先启动地图应用，这样至少有一些确认的位置，然后测试你的应用。