Android 取得即時定位 LocationManager

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <!--  宣告定位權限  -->
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <application>
        <!-- 略 -->
    </application>

</manifest>

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import android.Manifest
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import androidx.activity.result.contract.ActivityResultContracts

class MainActivity : AppCompatActivity() {

    // -----------------------Request Location Permission------------------------------
    private val resultLauncherPermission =
        registerForActivityResult(ActivityResultContracts.RequestPermission()) {
            if (it) {
                initLocationManager()
            } else {
                Toast.makeText(this, "請允許權限以開啟定位", Toast.LENGTH_SHORT).show()
                finish()
            }
        }

    // -----------------------------LifeCycle Event-------------------------------------

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        // 啟動時請求權限
        resultLauncherPermission.launch(Manifest.permission.ACCESS_FINE_LOCATION)
    }

    // --------------------------------------------------------------------------------

    private fun initLocationManager() {
        Toast.makeText(this, "定位權限請求成功，準備初始化 LocationManager", Toast.LENGTH_SHORT).show()
    }
}

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import android.location.LocationManager

val locationManager = getSystemService(Context.LOCATION_SERVICE) as LocationManager

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@SuppressLint("MissingPermission")
private fun requestLocationUpdates() {
    val minTimeMs = 500L
    val minDistanceM = 0.0f
    val provider = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
        LocationManager.FUSED_PROVIDER
    } else {
        LocationManager.GPS_PROVIDER
    }
    locationManager?.requestLocationUpdates(
        provider,
        minTimeMs,
        minDistanceM,
        locationListener
    )
}

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private val locationListener = object : LocationListener {
    override fun onLocationChanged(location: Location) {
        val output = "${location.provider}: ${location.longitude}, ${location.latitude}, ${location.altitude}"
        Log.d(TAG, "onLocationChanged: $output")
    }
}

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private fun stopLocationUpdates(){
    locationManager?.removeUpdates(locationListener)
}