LocationSourceDemoActivity.java

// Copyright 2026 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.


package com.example.mapdemo;

import android.Manifest.permission;
import android.annotation.SuppressLint;
import android.content.pm.PackageManager;
import androidx.core.app.ActivityCompat;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapLongClickListener;
import com.google.android.gms.maps.LocationSource;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;

import android.location.Location;
import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;

/**
 * This shows how to use a custom location source.
 */
public class LocationSourceDemoActivity extends SamplesBaseActivity implements OnMapReadyCallback {

    /**
     * A {@link LocationSource} which reports a new location whenever a user long presses the map
     * at
     * the point at which a user long pressed the map.
     */
    private static class LongPressLocationSource implements LocationSource, OnMapLongClickListener {

        private OnLocationChangedListener mListener;

        /**
         * Flag to keep track of the activity's lifecycle. This is not strictly necessary in this
         * case because onMapLongPress events don't occur while the activity containing the map is
         * paused but is included to demonstrate best practices (e.g., if a background service were
         * to be used).
         */
        private boolean mPaused;

        @Override
        public void activate(OnLocationChangedListener listener) {
            mListener = listener;
        }

        @Override
        public void deactivate() {
            mListener = null;
        }

        @Override
        public void onMapLongClick(LatLng point) {
            if (mListener != null && !mPaused) {
                Location location = new Location("LongPressLocationProvider");
                location.setLatitude(point.latitude);
                location.setLongitude(point.longitude);
                location.setAccuracy(100);
                mListener.onLocationChanged(location);
            }
        }

        public void onPause() {
            mPaused = true;
        }

        public void onResume() {
            mPaused = false;
        }
    }

    private LongPressLocationSource mLocationSource;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(com.example.common_ui.R.layout.basic_demo);

        androidx.appcompat.widget.Toolbar toolbar = findViewById(com.example.common_ui.R.id.top_bar);
        if (toolbar != null) {
            toolbar.setTitle(com.example.common_ui.R.string.location_source_demo_label);
        }

        mLocationSource = new LongPressLocationSource();

        SupportMapFragment mapFragment =
            (SupportMapFragment) getSupportFragmentManager().findFragmentById(com.example.common_ui.R.id.map);
        mapFragment.getMapAsync(this);
        applyInsets(findViewById(com.example.common_ui.R.id.map_container));
    }

    @Override
    protected void onResume() {
        super.onResume();
        mLocationSource.onResume();
    }

    @Override
    protected void onPause() {
        super.onPause();
        mLocationSource.onPause();
    }

    @SuppressLint("MissingPermission")
    @Override
    public void onMapReady(GoogleMap map) {
        map.setLocationSource(mLocationSource);
        map.setOnMapLongClickListener(mLocationSource);

        if (ActivityCompat.checkSelfPermission(this, permission.ACCESS_FINE_LOCATION)
            != PackageManager.PERMISSION_GRANTED
            && ActivityCompat.checkSelfPermission(this, permission.ACCESS_COARSE_LOCATION)
            != PackageManager.PERMISSION_GRANTED) {
            return;
        }
        map.setMyLocationEnabled(true);
    }
}