[Android] Google Map タップして移動、マーカーの追加

Google Mapの地図上でタップした位置に移動しマーカーを追加してみましょう。基本のGoogle Mapにタップのリスナーや長押しでのリスナーを追加するだけです。

Android Studio
2021.2.1

OnMapClickListener

　
>Google Maps Activity を選択してプロジェクトを作成すれば、ほとんど出来上がっています。API キーをセットしてください

https://akira-watson.com/android/google-map.html

あとは、OnMapClickListenerのリスナーをセットするだけです。
長押しの場合はOnMapLongClickListenerを使います。

MainActivity.java

//package your.package,name;

import androidx.annotation.NonNull;
import androidx.fragment.app.FragmentActivity;
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.example.testgooglemaptapandmove.databinding.ActivityMapsBinding;
import java.util.Locale;

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

    private GoogleMap mMap;
    private LatLng location;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        com.example.testgooglemaptapandmove.databinding.ActivityMapsBinding binding = ActivityMapsBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        assert mapFragment != null;
        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
    public void onMapReady(@NonNull GoogleMap googleMap) {
        mMap = googleMap;

        // 皇居辺りの緯度経度
        location = new LatLng(35.68, 139.76);
        // marker 追加
        mMap.addMarker(new MarkerOptions().position(location).title("Tokyo"));
        // camera 移動
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(location, 10));

        // タップした時のリスナーをセット
        mMap.setOnMapClickListener(tapLocation -> {
            // tapされた位置の緯度経度
            location = new LatLng(tapLocation.latitude, tapLocation.longitude);
            String str = String.format(Locale.US, "%f, %f", tapLocation.latitude, tapLocation.longitude);
            mMap.addMarker(new MarkerOptions().position(location).title(str));
            mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(location, 14));
        });

        // 長押しのリスナーをセット
        mMap.setOnMapLongClickListener(longpushLocation -> {
            LatLng newlocation = new LatLng(longpushLocation.latitude, longpushLocation.longitude);
            mMap.addMarker(new MarkerOptions().position(newlocation).title(""+longpushLocation.latitude+" :"+ longpushLocation.longitude));
            mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(newlocation, 14));
        });
    }
}

//package your.package,name;

import androidx.annotation.NonNull;

import androidx.fragment.app.FragmentActivity;

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.example.testgooglemaptapandmove.databinding.ActivityMapsBinding;

import java.util.Locale;

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

private GoogleMap mMap;

private LatLng location;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

com.example.testgooglemaptapandmove.databinding.ActivityMapsBinding binding = ActivityMapsBinding.inflate(getLayoutInflater());

setContentView(binding.getRoot());

// Obtain the SupportMapFragment and get notified when the map is ready to be used.

SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()

.findFragmentById(R.id.map);

assert mapFragment != null;

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

public void onMapReady(@NonNull GoogleMap googleMap) {

mMap = googleMap;

// 皇居辺りの緯度経度

location = new LatLng(35.68, 139.76);

// marker 追加

mMap.addMarker(new MarkerOptions().position(location).title("Tokyo"));

// camera 移動

mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(location, 10));

// タップした時のリスナーをセット

mMap.setOnMapClickListener(tapLocation -> {

// tapされた位置の緯度経度

location = new LatLng(tapLocation.latitude, tapLocation.longitude);

String str = String.format(Locale.US, "%f, %f", tapLocation.latitude, tapLocation.longitude);

mMap.addMarker(new MarkerOptions().position(location).title(str));

mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(location, 14));

});

// 長押しのリスナーをセット

mMap.setOnMapLongClickListener(longpushLocation -> {

LatLng newlocation = new LatLng(longpushLocation.latitude, longpushLocation.longitude);

mMap.addMarker(new MarkerOptions().position(newlocation).title(""+longpushLocation.latitude+" :"+ longpushLocation.longitude));

mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(newlocation, 14));

});

}

実行して、タップをするとマーカーが追加されるのが分かります。
　