[Android & Kotlin] FusedLocationProvider からGoogle Map地図の表示

FusedLocationProviderClientで位置情報の取得し、それをGoogle Mapで地図表示をすることがと可能です。

Android Studio
2021.2.1

FusedLocationProviderClient

GPSだけでなく、WiFiや電話網を使った位置情報はFusedLocationProviderClientで取得できます
　

cat57 00 100x100 - [Android & Kotlin] FusedLocationProvider からGoogle Map地図の表示

[Android] FusedLocationProviderClient を使って位置情報を取得

位置情報といえばGPSと思う人が多いとは思いますが、スマホでの位置情報はGPS以外にWiFiや電話網を駆使して短時間で効率の良い情報を取得で...

　
また、Google MapはAPI キーを取得して地図表示することは自由度はありますが、使用量による費用が発生することもあります。Intentを使ってGoogle Mapアプリを起動させてしまうのが簡単です
　

x13.4 gmap 00e 100x100 - [Android & Kotlin] FusedLocationProvider からGoogle Map地図の表示

[Android] Intentでの簡単なGoogle Map 地図の表示

API key 無しでIntentを使って簡単に Google Map を呼び出して地図を表示させる方法です。　 GoogleMapを...

　
作成手順としては以下を合体させます

FusedLocationProviderClientの更新リエストを作成
IntentでGoogle Mapに飛ばして地図表示

MapsActivity.kt

//package your.package.name

import androidx.activity.result.contract.ActivityResultContracts
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import android.Manifest
import android.annotation.SuppressLint
import android.content.Intent
import android.content.pm.PackageManager
import android.location.Location
import android.net.Uri
import android.os.Bundle
import android.os.Looper
import android.widget.TextView
import android.widget.Toast
import com.google.android.gms.location.*


class MainActivity : AppCompatActivity() {

    private lateinit var locationCallback: LocationCallback
    private lateinit var locationRequest: LocationRequest
    private lateinit var fusedLocationClient: FusedLocationProviderClient
    private var requestingLocationUpdates = false

    private val requestPermissionLauncher = registerForActivityResult(
        ActivityResultContracts.RequestPermission()) { isGranted: Boolean ->
        if (isGranted) {
            requestingLocationUpdates = true
        } else {
            val toast = Toast.makeText(
                this,
                "これ以上なにもできません", Toast.LENGTH_SHORT
            )
            toast.show()
        }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        if (ActivityCompat.checkSelfPermission(
                this, Manifest.permission.ACCESS_FINE_LOCATION)
            != PackageManager.PERMISSION_GRANTED) {

            requestPermissionLauncher.launch(Manifest.permission.ACCESS_FINE_LOCATION)

        } else {
            requestingLocationUpdates = true
        }

        locationRequest = LocationRequest.create().apply{
            interval = 10000
            fastestInterval = 5000
            priority = Priority.PRIORITY_HIGH_ACCURACY
        }

        locationCallback = object : LocationCallback() {
            override
            fun onLocationResult(locationResult: LocationResult) {
                for (location in locationResult.locations) {

                    val textView1 = findViewById<TextView>(R.id.text_view1)
                    val textView2 = findViewById<TextView>(R.id.text_view2)

                    // 緯度の表示
                    val str1 = " Latitude:" + location.latitude
                    textView1.text = str1

                    // 経度の表示
                    val str2 = " Longitude:" + location.longitude
                    textView2.text = str2

                    // Google Map
                    moveToGMap(location)
                }
            }
        }

        fusedLocationClient = LocationServices.getFusedLocationProviderClient(this)
    }

    private fun startLocationUpdates() {
        if (ActivityCompat.checkSelfPermission(
                this, Manifest.permission.ACCESS_FINE_LOCATION
            )
            != PackageManager.PERMISSION_GRANTED
        ) {
            return
        }
        fusedLocationClient.requestLocationUpdates(
            locationRequest,
            locationCallback,
            Looper.getMainLooper()
        )
    }

    @SuppressLint("QueryPermissionsNeeded")
    private fun moveToGMap(location: Location) {
        val str1: String = java.lang.String.valueOf(location.latitude)
        val str2: String = java.lang.String.valueOf(location.longitude)

        // geo:[lat,lng][?param[&param]...], param:z=zoom
        val uri: Uri = Uri.parse("geo:$str1,$str2?z=16")
        val intent = Intent(Intent.ACTION_VIEW, uri)
        startActivity(intent)
        if (intent.resolveActivity(packageManager) != null) {
            startActivity(intent)
        }
    }

    private fun stopLocationUpdates() {
        fusedLocationClient.removeLocationUpdates(locationCallback)
    }

    override fun onResume() {
        super.onResume()
        if (requestingLocationUpdates) {
            startLocationUpdates()
        }
    }

    override fun onPause() {
        super.onPause()
        stopLocationUpdates()
    }

}

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//package your.package.name

import androidx.activity.result.contract.ActivityResultContracts

import androidx.appcompat.app.AppCompatActivity

import androidx.core.app.ActivityCompat

import android.Manifest

import android.annotation.SuppressLint

import android.content.Intent

import android.content.pm.PackageManager

import android.location.Location

import android.net.Uri

import android.os.Bundle

import android.os.Looper

import android.widget.TextView

import android.widget.Toast

import com.google.android.gms.location.*

class MainActivity : AppCompatActivity() {

private lateinit var locationCallback: LocationCallback

private lateinit var locationRequest: LocationRequest

private lateinit var fusedLocationClient: FusedLocationProviderClient

private var requestingLocationUpdates = false

private val requestPermissionLauncher = registerForActivityResult(

ActivityResultContracts.RequestPermission()) { isGranted: Boolean ->

if (isGranted) {

requestingLocationUpdates = true

} else {

val toast = Toast.makeText(

this,

"これ以上なにもできません", Toast.LENGTH_SHORT

)

toast.show()

}

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

setContentView(R.layout.activity_main)

if (ActivityCompat.checkSelfPermission(

this, Manifest.permission.ACCESS_FINE_LOCATION)

!= PackageManager.PERMISSION_GRANTED) {

requestPermissionLauncher.launch(Manifest.permission.ACCESS_FINE_LOCATION)

} else {

requestingLocationUpdates = true

}

locationRequest = LocationRequest.create().apply{

interval = 10000

fastestInterval = 5000

priority = Priority.PRIORITY_HIGH_ACCURACY

}

locationCallback = object : LocationCallback() {

override

fun onLocationResult(locationResult: LocationResult) {

for (location in locationResult.locations) {

val textView1 = findViewById<TextView>(R.id.text_view1)

val textView2 = findViewById<TextView>(R.id.text_view2)

// 緯度の表示

val str1 = " Latitude:" + location.latitude

textView1.text = str1

// 経度の表示

val str2 = " Longitude:" + location.longitude

textView2.text = str2

// Google Map

moveToGMap(location)

}

fusedLocationClient = LocationServices.getFusedLocationProviderClient(this)

}

private fun startLocationUpdates() {

if (ActivityCompat.checkSelfPermission(

this, Manifest.permission.ACCESS_FINE_LOCATION

)

!= PackageManager.PERMISSION_GRANTED

) {

return

}

fusedLocationClient.requestLocationUpdates(

locationRequest,

locationCallback,

Looper.getMainLooper()

)

}

@SuppressLint("QueryPermissionsNeeded")

private fun moveToGMap(location: Location) {

val str1: String = java.lang.String.valueOf(location.latitude)

val str2: String = java.lang.String.valueOf(location.longitude)

// geo:[lat,lng][?param[&param]...], param:z=zoom

val uri: Uri = Uri.parse("geo:$str1,$str2?z=16")

val intent = Intent(Intent.ACTION_VIEW, uri)

startActivity(intent)

if (intent.resolveActivity(packageManager) != null) {

startActivity(intent)

}

private fun stopLocationUpdates() {

fusedLocationClient.removeLocationUpdates(locationCallback)

}

override fun onResume() {

super.onResume()

if (requestingLocationUpdates) {

startLocationUpdates()

}

override fun onPause() {

super.onPause()

stopLocationUpdates()

}

　
activity_main.xml

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

    <TextView
        android:id="@+id/text_view1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:textColor="#44f"
        android:textSize="20sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.501"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.2" />

    <TextView
        android:id="@+id/text_view2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:textColor="#f44"
        android:layout_margin="20dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.3" />

</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout

xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity">

<TextView

android:id="@+id/text_view1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_margin="20dp"

android:textColor="#44f"

android:textSize="20sp"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintHorizontal_bias="0.501"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toTopOf="parent"

app:layout_constraintVertical_bias="0.2" />

<TextView

android:id="@+id/text_view2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textSize="20sp"

android:textColor="#f44"

android:layout_margin="20dp"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintHorizontal_bias="0.5"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toTopOf="parent"

app:layout_constraintVertical_bias="0.3" />

</androidx.constraintlayout.widget.ConstraintLayout>

play-services-locationのライブラリ追加
build.gradle(Module…)
19.0.1 と20.0.0では、PRIORITY_HIGH_ACCURACYの差分があります

plugins {
    ...
}

android {
    ...
}

dependencies {
    implementation 'com.google.android.gms:play-services-location:20.0.0'
    ...
}

plugins {

...

}

android {

...

}

dependencies {

implementation 'com.google.android.gms:play-services-location:20.0.0'

...

}

位置情報のパーミッション
AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    ... >
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

    <application
        ...
    </application>

</manifest>

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

... >

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

<application

...

</application>

</manifest>

emulatorのLocationをハワイにセットして実行してみました

References:
直近の位置情報を取得する – Android Developers
現在地の更新情報をリクエストする – Android デベロッパー
 位置情報の設定を変更する – Android デベロッパー
 FusedLocationProviderClient
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