MapsActivity.java

package com.casper.memorableplacesversion20;

import android.Manifest;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.support.v4.content.ContextCompat;
import android.util.Log;

import com.google.android.gms.maps.CameraUpdate;
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.Marker;
import com.google.android.gms.maps.model.MarkerOptions;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

    private GoogleMap mMap;
    LocationManager locationManager;
    LocationListener locationListener;
    Marker marker;

    void focusOnMap(LatLng latLng, String message){
        mMap.addMarker(new MarkerOptions().position(latLng).title("message"));
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 12));
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
        }

    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
    }


    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;

        // Add a marker in Sydney and move the camera
        locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        locationListener = new LocationListener() {
            @Override
            public void onLocationChanged(Location location) {
                LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
                marker.setPosition(latLng);
                mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 12));

            }

            @Override
            public void onStatusChanged(String s, int i, Bundle bundle) {

            }

            @Override
            public void onProviderEnabled(String s) {

            }

            @Override
            public void onProviderDisabled(String s) {

            }
        };
        LatLng sydney = new LatLng(-34, 151);
        marker = mMap.addMarker(new MarkerOptions().position(sydney).title("You are here"));
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney, 12));
        if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED){
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
        }
        else{

            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0,locationListener);
        }

        Intent intent = getIntent();
        if(intent.getIntExtra("index", 0) != 0) {

            int index = intent.getIntExtra("index",0);
            LatLng target = MainActivity.latLngArrayList.get(index-1);
            focusOnMap(target, MainActivity.places.get(index));

        }

        mMap.setOnMapLongClickListener(new GoogleMap.OnMapLongClickListener() {
            @Override
            public void onMapLongClick(LatLng latLng) {
                Geocoder geocoder = new Geocoder(getApplicationContext(), Locale.getDefault());
                MainActivity.latLngArrayList.add(latLng);
                try{
                    String address = "";
                    List<Address> addressList = geocoder.getFromLocation(latLng.latitude, latLng.longitude, 1);
                    if(addressList.get(0).getThoroughfare() != null){
                        address += addressList.get(0).getThoroughfare() + " ";
                    }
                    if(addressList.get(0).getLocality() != null){
                        address += addressList.get(0).getLocality() + " ";
                    }
                    if(addressList.get(0).getSubAdminArea() != null){
                        address += addressList.get(0).getSubAdminArea();
                    }
                    if(address.equals("")){
                        SimpleDateFormat sdf = new SimpleDateFormat("HH:mm yyyy-MM-dd");
                        address += sdf.format(new Date());
                    }
                    MainActivity.places.add(address);
                    mMap.addMarker(new MarkerOptions().position(latLng).title(address));
                    MainActivity.arrayAdapter.notifyDataSetChanged();

                    Log.i("message", addressList.toString());
                } catch(Exception e){
                    e.printStackTrace();
                }
            }
        });

    }
}