西瓜是肥貓

記得加入 Permission宣告：
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          xmlns:tools="http://schemas.android.com/tools" package="com.deyu.sample">
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

App Gradle 依賴如下：

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.google.android.gms:play-services-location:17.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

主要的layout xml檔：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".LocationActivity">


    <Button
            android:id="@+id/btn_request_location"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_constraintBottom_toTopOf="@+id/tv_location" android:layout_marginTop="8dp"
            app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent"
            android:layout_marginStart="8dp" app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"
    android:text="按一下更新座標"/>
    <TextView
     android:id="@+id/tv_location"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="8dp"
            app:layout_constraintBottom_toBottomOf="parent" android:layout_marginTop="8dp"
            app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent"
            android:layout_marginStart="8dp" app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"/>
</android.support.constraint.ConstraintLayout>

主要Activity的程式碼：

package com.deyu.sample

import android.Manifest
import android.annotation.SuppressLint
import android.content.Intent
import android.content.pm.PackageManager
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import com.google.android.gms.location.LocationCallback
import com.google.android.gms.location.LocationRequest
import com.google.android.gms.location.LocationResult
import com.google.android.gms.location.LocationServices
import kotlinx.android.synthetic.main.activity_location.*
import java.util.*


class LocationActivity : AppCompatActivity() {
    //    需要的權限
    private val NeedPermissions =
        arrayOf(Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION)
    private val PERMISSION_REQUEST_CODE = 487

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_location)
        setup()
    }

    private fun setup() {
        if (!requestAllNeedPermissions())
            return;
        btn_request_location.setOnClickListener { requestLocation() }
    }

    @SuppressLint("MissingPermission")
    fun requestLocation() {
        val mLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);

        val locationRequest = LocationRequest();
        locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
//         設定更新速度
        locationRequest.setInterval(1000)
//        設定要更新幾次座標
        locationRequest.setNumUpdates(1)
        mLocationProviderClient.requestLocationUpdates(locationRequest, object : LocationCallback() {
            override fun onLocationResult(locationresult: LocationResult?) {
                locationresult ?: return
                val locationText =
                    "你應該是在 經度:${locationresult.lastLocation.longitude} , 緯度${locationresult.lastLocation.latitude}"
                tv_location.setText(locationText)
            }
        }, null)
    }

    //    回傳是否已經有權限。
    fun requestAllNeedPermissions(): Boolean {
        val permissionsList = ArrayList<String>()
        for (permission in NeedPermissions)
            if (checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED)
                permissionsList.add(permission)
        if (permissionsList.size < 1)
            return true

        ActivityCompat.requestPermissions(this, permissionsList.toTypedArray(), PERMISSION_REQUEST_CODE)
        return false
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if (requestCode == PERMISSION_REQUEST_CODE) {
            setup()
        }
    }

}

完成結果如下：