The location obtained by getLastLocation() always returns null

Question

I’m making several attempts, but I can’t get the current location of a user using the Location API.

I am running the following example:

    public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {

     Location localizacao;
     GoogleApiClient mapGoogleApiClient;
     EditText edtLat;
     EditText edtLog;
     Button btLocalizacao;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    edtLat = (EditText) findViewById(R.id.edtLatitude);
    edtLog = (EditText) findViewById(R.id.edtLongitude);
    btLocalizacao = (Button) findViewById(R.id.btLocalizacao);

    if (mapGoogleApiClient == null) {
        mapGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
    }

    btLocalizacao.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            GPS();
        }
    });
    }




    @TargetApi(Build.VERSION_CODES.M)
    public void GPS() {
if(checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION)!=PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        //    public void requestPermissions(@NonNull String[] permissions, int requestCode)
        // 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 Activity#requestPermissions for more details.
        return;
    }
    localizacao = LocationServices.FusedLocationApi.getLastLocation(mapGoogleApiClient);
    if (localizacao != null) {
        edtLat.setText(String.valueOf(localizacao.getLatitude()));
        edtLog.setText(String.valueOf(localizacao.getLongitude()));
    } else {
        AlertDialog erroLocation = new AlertDialog.Builder(this).create();
        erroLocation.setIcon(R.drawable.alert);
        erroLocation.setTitle("Localização não encontrada");
        erroLocation.setMessage("Sua Localização não foi encontrada!! Tente novamente!");
        erroLocation.show();
    }
}

@Override
public void onConnected(Bundle bundle) {

}

@Override
public void onConnectionSuspended(int i) {

}

@Override
public void onConnectionFailed(ConnectionResult connectionResult) {

}}

The system runs perfectly, however it ends up every moment falling into the Else (code below) of the GPS method, because it is not passing the location:

else {
    AlertDialog erroLocation = new AlertDialog.Builder(this).create();
    erroLocation.setIcon(R.drawable.alert);
    erroLocation.setTitle("Localização não encontrada");
    erroLocation.setMessage("Sua Localização não foi encontrada!! Tente novamente!");
    erroLocation.show();
}

This question is not duplicated as it is a different case and was using other methods to make it work. Answer below successfully solved that question.

Answer 1

As warned our friend in the comments, I decided to improve the response by posting two ways to capture GPS, using GoogleApiClient and using LocationManager. Under conditions of Android 6.0(Api level 23) exists the Requesting Permissions at Run Time which is the issue of permissions, which is very interesting you give read and learn more.

1. Google Location API

Localization Apis make it easy to create apps with science location and low power consumption. Like Google Maps Android API, Location API is distributed as part of the Google Play SDK Services.

Main class

public class Main extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {

    GoogleApiClient mapGoogleApiClient;
    EditText edtLat;
    EditText edtLog;
    Button btLocalizacao;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_get_localization);

        edtLat = (EditText) findViewById(R.id.et1);
        edtLog = (EditText) findViewById(R.id.et2);
        btLocalizacao = (Button) findViewById(R.id.btLocalizacao);

        if (mapGoogleApiClient == null) {
            mapGoogleApiClient = new GoogleApiClient.Builder(this)
                    .addConnectionCallbacks(this)
                    .addOnConnectionFailedListener(this)
                    .addApi(LocationServices.API)
                    .build();
        }

        btLocalizacao.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (GetLocalization(Main.this)) {
                    if (ActivityCompat.checkSelfPermission(Main.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(Main.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                        // TODO: Consider calling
                        return;
                    }
                    Location location = LocationServices.FusedLocationApi.getLastLocation(mapGoogleApiClient);
                    if (location != null) {
                        edtLat.setText(String.valueOf(location.getLatitude()));
                        edtLog.setText(String.valueOf(location.getLongitude()));
                    } else {
                        showSettingsAlert();
                    }
                }
            }
        });
    }

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

    @Override
    protected void onPause() {
        super.onPause();
        if (mapGoogleApiClient.isConnected()) {
            mapGoogleApiClient.disconnect();
        }
    }
    @Override
    public void onConnected(Bundle bundle) {

    }

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {

    }

    public boolean GetLocalization(Context context){
        int REQUEST_PERMISSION_LOCALIZATION = 221;
        boolean res=true;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                // TODO: Consider calling
                res = false;
                ActivityCompat.requestPermissions((Activity) context, new String[]{
                                Manifest.permission.ACCESS_FINE_LOCATION},
                        REQUEST_PERMISSION_LOCALIZATION);

            }
        }
        return res;
    }

    /**
     * Este metodo exite uma alerta para configuração do GPS
     */
    public void showSettingsAlert(){
        android.app.AlertDialog.Builder alertDialog = new android.app.AlertDialog.Builder(Main.this);

        // Titulo do dialogo
        alertDialog.setTitle("GPS");

        // Mensagem do dialogo
        alertDialog.setMessage("GPS não está habilitado. Deseja configurar?");

        // On pressing Settings button
        alertDialog.setPositiveButton("Configurar", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                Main.this.startActivity(intent);
            }
        });

        // on pressing cancel button
        alertDialog.setNegativeButton("Cancelar", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });

        // visualizacao do dialogo
        alertDialog.show();
    }
}

2. Locationmanager

I ran some tests and created a class called ObtainGPS to solve your problem, which would capture your current location (latitude/longitude). It also has a method showSettingsAlert() that checks if the device’s GPS is enabled, if not enabled, the app directs you so that you can configure/enable. Well, on Main you just need to declare the ObtainGPS in addition to creating a method GetLocalization. Then it would look like this:

Main class

public class Main extends AppCompatActivity {

    ObtainGPS gps;
    Button btLocalizacao;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_get_localization);

        btLocalizacao = (Button) findViewById(R.id.button3);

        btLocalizacao.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getLocalization();
            }
        });
    }

    public void getLocalization() {
        gps = new ObtainGPS(Main.this);


        if (GetLocalization(Main.this)) {
            // check if GPS enabled
            if (gps.canGetLocation()) {

                AlertDialog erroLocation = new AlertDialog.Builder(this).create();
                erroLocation.setTitle("Localização");
                erroLocation.setMessage("Lat:" + gps.getLatitude() + " Lng:" + gps.getLongitude());
                erroLocation.show();

            } else {

                AlertDialog erroLocation = new AlertDialog.Builder(this).create();
                erroLocation.setTitle("Localização não encontrada");
                erroLocation.setMessage("Sua Localização não foi encontrada!! Tente novamente!");
                erroLocation.show();
                gps.showSettingsAlert();
            }

        }
    }

    public boolean GetLocalization(Context context) {
        int REQUEST_PERMISSION_LOCALIZATION = 221;
        boolean res = true;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                // TODO: Consider calling
                //    public void requestPermissions(@NonNull String[] permissions, int requestCode)
                // 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 Activity#requestPermissions for more details.

                res = false;
                ActivityCompat.requestPermissions((Activity) context, new String[]{
                                Manifest.permission.ACCESS_FINE_LOCATION},
                        REQUEST_PERMISSION_LOCALIZATION);

            }
        }
        return res;
    }
}

An observation I’m using here getLastKnownLocation

location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

Obtaingps class

public class ObtainGPS extends Service implements LocationListener {

    private final Context mContext;

    // flag for GPS status
    boolean isGPSEnabled = false;

    // flag for network status
    boolean isNetworkEnabled = false;

    // flag for GPS status
    boolean canGetLocation = false;

    Location location; // location
    double latitude; // latitude
    double longitude; // longitude

    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

    // Declaring a Location Manager
    protected LocationManager locationManager;

    public ObtainGPS(Context context) {
        this.mContext = context;

        getLocation();
    }

    public Location getLocation() {
        try {
            locationManager = (LocationManager) mContext
                    .getSystemService(LOCATION_SERVICE);

            // getting GPS status
            isGPSEnabled = locationManager
                    .isProviderEnabled(LocationManager.GPS_PROVIDER);

            // getting network status
            isNetworkEnabled = locationManager
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } else {
                this.canGetLocation = true;
                // First get location from Network Provider
                if (isNetworkEnabled) {

                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                        if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                            // TODO: Consider calling
                            //    public void requestPermissions(@NonNull String[] permissions, int requestCode)
                            // 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 Activity#requestPermissions for more details.
                            return null;
                        }
                    }
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }

                }
                // if GPS Enabled get lat/long using GPS Services
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            }
                        }
                    }
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return location;
    }

    /**
     * Function to get latitude
     * */
    public double getLatitude(){
        if(location != null){
            latitude = location.getLatitude();
        }

        // return latitude
        return latitude;
    }

    /**
     * Function to get longitude
     * */
    public double getLongitude(){
        if(location != null){
            longitude = location.getLongitude();
        }

        // return longitude
        return longitude;
    }

    /**
     * Function to check GPS/wifi enabled
     * @return boolean
     * */
    public boolean canGetLocation() {
        return this.canGetLocation;
    }

    /**
     * Function to show settings alert dialog
     * On pressing Settings button will lauch Settings Options
     * */
    public void showSettingsAlert(){
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

        // Setting Dialog Title
        alertDialog.setTitle("GPS");

        // Setting Dialog Message
        alertDialog.setMessage("GPS não está habilitado. Você deseja configura-lo?");

        // On pressing Settings button
        alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                mContext.startActivity(intent);
            }
        });

        // on pressing cancel button
        alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });

        // Showing Alert Message
        alertDialog.show();
    }

    @Override
    public void onLocationChanged(Location location) {
    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

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

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }
}

Screenshots

I created a repository on Github by name obtgps picking up strings using two forms. You can download the project and do the proper checks.

Details

• Intentions of Google Maps

Answer 2

Although its implementation is minimal, to get the location I think only need call mapGoogleApiClient.connect().

I do the overrun of the methods onStart() and onStop() thus:

@Override
public void onStart() {
    super.onStart();
    mapGoogleApiClient.connect();
}

@Override
public void onStop() {
    super.onStop();
    mapGoogleApiClient.disconnect();
}