GoogleMapと連携

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GoogleMapを簡単に表示するだけならば、ウィザードで作るのがよい。
[activity右クリック]→[New]→[Gallery]を選択する。

表示されたギャラリーからMapを選択する。

google_maps_api.xmlが作成されているので、23行目にGoogleMapのAPIキーを指定する。
APIキーはGoogleAPIConsoleで取得できる。

<resources>
    <!--
    TODO: Before you run your application, you need a Google Maps API key.

    To get one, follow this link, follow the directions and press "Create" at the end:

    https://console.developers.google.com/flows/enableapi?apiid=maps_android_backend&keyType=CLIENT_SIDE_ANDROID&r=01:46:5B:16:F5:91:81:FC:DE:A3:AC:4E:EE:88:3E:4B:16:40:FB:D4%3Bcom.v3.basis.blas.activity

    You can also add your credentials to an existing key, using these values:

    Package name:
    com.v3.basis.blas.activity

    SHA-1 certificate fingerprint:
    01:46:5B:16:F5:91:81:FC:DE:A3:AC:4E:EE:88:3E:4B:16:40:FB:D4

    Alternatively, follow the directions here:
    https://developers.google.com/maps/documentation/android/start#get-key

    Once you have your key (it starts with "AIza"), replace the "google_maps_key"
    string in this file.
    -->
    <string name="google_maps_key" templateMergeStrategy="preserve" translatable="false">ここにAPIキーを指定する</string>
</resources>

作成されたアクティビティにこんな感じで書くと、地図が表示される。

package com.v3.basis.blas.activity

import android.location.Geocoder
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle

import com.google.android.gms.maps.CameraUpdateFactory
import com.google.android.gms.maps.GoogleMap
import com.google.android.gms.maps.OnMapReadyCallback
import com.google.android.gms.maps.SupportMapFragment
import com.google.android.gms.maps.model.LatLng
import com.google.android.gms.maps.model.MarkerOptions
import com.v3.basis.blas.R
import java.util.*

class MapsActivity : AppCompatActivity(), OnMapReadyCallback {

    private lateinit var mMap: GoogleMap

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_maps)
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        val mapFragment = supportFragmentManager
            .findFragmentById(R.id.map) as SupportMapFragment
        mapFragment.getMapAsync(this)
    }

    /**
     * Manipulates the map once available.
     * This callback is triggered when the map is ready to be used.
     * This is where we can add markers or lines, add listeners or move the camera. In this case,
     * we just add a marker near Sydney, Australia.
     * If Google Play services is not installed on the device, the user will be prompted to install
     * it inside the SupportMapFragment. This method will only be triggered once the user has
     * installed Google Play services and returned to the app.
     */
    override fun onMapReady(googleMap: GoogleMap) {
        mMap = googleMap
        mMap.uiSettings.isScrollGesturesEnabled = true
        mMap.uiSettings.isZoomGesturesEnabled = true
        mMap.uiSettings.isMapToolbarEnabled = true
        mMap.uiSettings.isCompassEnabled = true
        mMap.uiSettings.isMyLocationButtonEnabled = true

        val geoCorder = Geocoder(this, Locale.getDefault())
        val addrList = geoCorder.getFromLocationName("東京都千代田区霞が関3-1-1", 1)
        val address = addrList.get(0)
        // Add a marker in Sydney and move the camera
        val sydney = LatLng(address.latitude, address.longitude)
        //mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(sydney, 1.0f))
        mMap.addMarker(MarkerOptions().position(sydney).title("東京都千代田区霞が関3-1-1"))
        val zoomRate = 15.0f//mMap.maxZoomLevel
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney, zoomRate))
    }
}