How can I get my location with Kotlin dev Android?

问题

I'm making a Google Maps app. I've put on the API key, and the default code runs without any problems, but I don't know how to localize my position...

I looked around and found this document:

Kotlin API

But still when I try to import:

import com.google.android.location.Location

the first "location" will appear in red... It looks like this API document is deprecated, so I don't know what to import or use to build my app...

How can I fix this?

回答1:

Try this code for getting the current location:

File activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:orientation="vertical">

    <TextView
            android:id="@+id/latTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Latitude: "/>

    <TextView
            android:id="@+id/lonTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Longitude: "/>

</LinearLayout>

File MainActivity.kt

import android.Manifest
import android.annotation.SuppressLint
import android.content.Context
import android.content.Intent
import android.content.pm.PackageManager
import android.location.Location
import android.location.LocationManager
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.os.Looper
import android.provider.Settings
import android.widget.TextView
import android.widget.Toast
import androidx.core.app.ActivityCompat
import com.google.android.gms.location.*

class MainActivity : AppCompatActivity() {

    val PERMISSION_ID = 42
    lateinit var mFusedLocationClient: FusedLocationProviderClient
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this)

        getLastLocation()
    }

    @SuppressLint("MissingPermission")
    private fun getLastLocation() {
        if (checkPermissions()) {
            if (isLocationEnabled()) {

                mFusedLocationClient.lastLocation.addOnCompleteListener(this) { task ->
                    var location: Location? = task.result
                    if (location == null) {
                        requestNewLocationData()
                    } else {
                        findViewById<TextView>(R.id.latTextView).text = location.latitude.toString()
                        findViewById<TextView>(R.id.lonTextView).text = location.longitude.toString()
                    }
                }
            } else {
                Toast.makeText(this, "Turn on location", Toast.LENGTH_LONG).show()
                val intent = Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS)
                startActivity(intent)
            }
        } else {
            requestPermissions()
        }
    }

    @SuppressLint("MissingPermission")
    private fun requestNewLocationData() {
        var mLocationRequest = LocationRequest()
        mLocationRequest.priority = LocationRequest.PRIORITY_HIGH_ACCURACY
        mLocationRequest.interval = 0
        mLocationRequest.fastestInterval = 0
        mLocationRequest.numUpdates = 1

        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this)
        mFusedLocationClient!!.requestLocationUpdates(
            mLocationRequest, mLocationCallback,
            Looper.myLooper()
        )
    }

    private val mLocationCallback = object : LocationCallback() {
        override fun onLocationResult(locationResult: LocationResult) {
            var mLastLocation: Location = locationResult.lastLocation
            findViewById<TextView>(R.id.latTextView).text = mLastLocation.latitude.toString()
            findViewById<TextView>(R.id.lonTextView).text = mLastLocation.longitude.toString()
        }
    }

    private fun isLocationEnabled(): Boolean {
        var locationManager: LocationManager = getSystemService(Context.LOCATION_SERVICE) as LocationManager
        return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER) || locationManager.isProviderEnabled(
            LocationManager.NETWORK_PROVIDER
        )
    }

    private fun checkPermissions(): Boolean {
        if (ActivityCompat.checkSelfPermission(
                this,
                Manifest.permission.ACCESS_COARSE_LOCATION
            ) == PackageManager.PERMISSION_GRANTED &&
            ActivityCompat.checkSelfPermission(
                this,
                Manifest.permission.ACCESS_FINE_LOCATION
            ) == PackageManager.PERMISSION_GRANTED
        ) {
            return true
        }
        return false
    }

    private fun requestPermissions() {
        ActivityCompat.requestPermissions(
            this,
            arrayOf(Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION),
            PERMISSION_ID
        )
    }


    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
        if (requestCode == PERMISSION_ID) {
            if ((grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED)) {
                getLastLocation()
            }
        }
    }
}

See here for more details: Getting Current Location (latitude, longitude) in Android using Kotlin

来源：https://stackoverflow.com/questions/60971836/how-can-i-get-my-location-with-kotlin-dev-android