Problems with obtaining location in android studio

To get the location you have to do the following

first in the build gradle we import the play services location library

implementation 'com.google.android.gms:play-services-location:15.0.1'

We are going to use the FuseLocationProviderClient, for that we declare it

 private FusedLocationProviderClient mFusedLocationClient;

Then in onCreate() we initialize it

mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);

Ready, now the only thing that remains is to ask for the location, for that we will need

We are going to create a method where first ask for the permissions and then get the location

    private void solicitarUbicacion(){
private int MY_PERMISSIONS_REQUEST_READ_CONTACTS ;            
//Permisos para FINE LOCATION
            if (ActivityCompat.checkSelfPermission(this,
                    Manifest.permission.ACCESS_FINE_LOCATION)
                    != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
                    != PackageManager.PERMISSION_GRANTED) {

                ActivityCompat.requestPermissions(MainActivity.this,
                        new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                        MY_PERMISSIONS_REQUEST_READ_CONTACTS);




                    return;
                }
                //Obteniendo la ubicacion
                mFusedLocationClient.getLastLocation()
                        .addOnSuccessListener(this, new OnSuccessListener<Location>() {
                            @Override
                            public void onSuccess(Location location) {
                                //Sabiendo que obtuvimos location, lo usamos
                                if (location != null) {
                                    Log.e("Latitud: ", +location.getLatitude() + "Longitud: " + location.getLongitude());


                                }
                            }
                        });
            }

This method you can call it inside the onCreate()

solicitarUbicacion();

With that you should work, do not forget to add your permissions to the manifest

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

Any questions you have made a video a month ago, I leave it in THIS link

First you must define the necessary permissions in your AndroidManifest.xml

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

You have already defined the request for these permissions for devices with Android 6.0 or later, therefore this screen should be displayed:

Something important, your Location service must be activated otherwise location will have a value null

The 3 points above are necessary to obtain geolocation, but it is important to know that the provider you use may not obtain the data (you use only NETWORK_PROVIDER ), so suppliers are usually used GPS_PROVIDER or NETWORK_PROVIDER , since it may be that you are on a 4G network or on a WiFi network and with this we ensure you get the position.

This would be the code:

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

        ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);

        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.

            return;
        }
        LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
        Location location = null;
        LocationListener mlocListener = new LocationListener() {
            @Override
            public void onLocationChanged(Location location) {

            }

            @Override
            public void onStatusChanged(String provider, int status, Bundle extras) {

            }

            @Override
            public void onProviderEnabled(String provider) {

            }

            @Override
            public void onProviderDisabled(String provider) {

            }
        };

        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
        if (locationManager != null) {
            //Existe GPS_PROVIDER obtiene ubicación
            location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
        }

        if(location == null){ //Trata con NETWORK_PROVIDER
            locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, mlocListener);
            if (locationManager != null) {
                //Existe NETWORK_PROVIDER obtiene ubicación
                location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
            }
        }
        if(location != null) {
            Toast.makeText(this, "La latitud es:" + location.getLatitude() + " la longitud es: " +location.getLongitude(), Toast.LENGTH_LONG).show();
        }else {
            Toast.makeText(this, "No se pudo obtener geolocalización", Toast.LENGTH_LONG).show();                
        }

    }

In this way you can obtain your geolocation in an appropriate way.