【Kotlin/Android】現在地の位置情報を取得する方法！FusedLocation

build.gradle(Module)
dependencies {
    implementation 'com.google.android.gms:play-services-location:21.3.0'
}

AndroidManifest.xml
<!-- 正確な位置(GPS) -->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

<!-- おおよその位置(Wi-Fiやネットワーク) -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

<!-- backgroundでの位置情報   -->
<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />

MainActivity.kt
class MainActivity : AppCompatActivity() {
    private lateinit var binding: ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main)

        // 許可申請ダイアログを表示
        launcher.launch(
            arrayOf(
                Manifest.permission.ACCESS_FINE_LOCATION,
                Manifest.permission.ACCESS_COARSE_LOCATION,
            )
        )
    }

    private val launcher =
        registerForActivityResult(ActivityResultContracts.RequestMultiplePermissions()) {
            it
            val fineLocation = it[Manifest.permission.ACCESS_FINE_LOCATION] ?: false
            val coarseLocation = it[Manifest.permission.ACCESS_COARSE_LOCATION] ?: false

            if (fineLocation && coarseLocation) {
                Toast.makeText(this, "許可されました", Toast.LENGTH_SHORT)
                    .show()
            } else {
                Toast.makeText(this, "否認されました", Toast.LENGTH_SHORT)
                    .show()
            }
        }
}

class MainActivity : AppCompatActivity() {

    private lateinit var fusedLocationClient: FusedLocationProviderClient

    override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      binding = DataBindingUtil.setContentView(this, R.layout.activity_main)

      // ①位置情報取得のためのクライアントをインスタンス化
      fusedLocationClient = LocationServices.getFusedLocationProviderClient(this)

      binding.doneButton.setOnClickListener{
          // ②パーミションチェック
          if (ActivityCompat.checkSelfPermission(
                  this,
                  Manifest.permission.ACCESS_FINE_LOCATION
              ) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(
                  this,
                  Manifest.permission.ACCESS_COARSE_LOCATION
              ) != PackageManager.PERMISSION_GRANTED
          ) {
              Log.e("位置情報", "権限が許可されていないよ")
              return@setOnClickListener
          }

          // ③現在値の位置情報(最後に取得した位置情報)を取得
          fusedLocationClient.lastLocation
              .addOnSuccessListener { location : Location? ->
                  location?.let {
                      Log.e("位置情報", location.toString())
                      Log.e("位置情報：緯度", location.latitude.toString())
                      Log.e("位置情報：軽度", location.longitude.toString())
                  }?: run {
                      Log.e("位置情報", "位置情報取得失敗")
                  }
              }
      }
    }
}

MainActivity.kt
// importは以下なので注意
import com.google.android.gms.location.LocationRequest
// import android.location.LocationRequest // これは ×
  
class MainActivity : AppCompatActivity() {
    private lateinit var locationRequest: LocationRequest

    override fun onCreate(savedInstanceState: Bundle?) {
      // 〜〜〜〜〜〜〜〜〜〜

      // LocationRequestの設定
      // Builderの引数には精度と更新間隔(例：5秒)を渡す
      locationRequest = LocationRequest.Builder(Priority.PRIORITY_HIGH_ACCURACY, 5000)
          .build()
    }
}

MainActivity.kt
class MainActivity : AppCompatActivity() {
    private lateinit var locationCallback: LocationCallback

    override fun onCreate(savedInstanceState: Bundle?) {
        // 〜〜〜〜〜〜〜〜〜〜

        // LocationCallbackの定義
        locationCallback = object : LocationCallback() {
            override fun onLocationResult(locationResult: LocationResult) {
                for (location in locationResult.locations) {
                    Log.e("位置情報", location.toString())
                    Log.e("位置情報：緯度", location.latitude.toString())
                    Log.e("位置情報：軽度", location.longitude.toString())
                }
            }
        }
    }
}

MainActivity.kt
class MainActivity : AppCompatActivity() {
    private lateinit var locationCallback: LocationCallback

    override fun onCreate(savedInstanceState: Bundle?) {
        // 〜〜〜〜〜〜〜〜〜〜

        // 位置情報更新&観測開始
        fusedLocationClient.requestLocationUpdates(
            locationRequest,
            locationCallback,
            Looper.getMainLooper() // メインスレッドで実行
        )
    }

    // 観測のキャンセルも忘れずに
    override fun onPause() {
        super.onPause()
        // アクティビティが一時停止したときに位置情報の更新を停止
        fusedLocationClient.removeLocationUpdates(locationCallback)
    }
}

val handlerThread = HandlerThread("LocationHandlerThread")
handlerThread.start()
val looper = handlerThread.looper
fusedLocationClient.requestLocationUpdates(
  locationRequest, 
  locationCallback, 
  looper
)