How to get gps coordinates in java on android

Question

What is the best way to get latitude and longitude on android. Ex. after the request (tap the button) the user waits for the gps to get the coordinates and after that displays them for the same.

Answer 1

Well, there are several ways, I’ll give you one:

First you create a service to get latitude and longitude, then just instantiate it when you click on a button to get the coordinates.

public class GPSTracker extends Service implements LocationListener {
    private final Context mContext;

    // flag para GPS status
    boolean isGPSEnabled = false;

    // flag para network status
    boolean isNetworkEnabled = false;

    // flag para GPS status
    boolean canGetLocation = false;

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

    // A distância mínima para mudar Atualizações em metros
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 0; // 10 metros

    // O tempo mínimo entre as atualizações em milissegundos
    private static final long MIN_TIME_BW_UPDATES = 0; // 1 minute=1000 * 60 * 1

    // Declarar a Location Manager
    protected LocationManager locationManager;

    public GPSTracker(Context context) {
        this.mContext = context;
        getLocation();
    }

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

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

            // obter o status da rede
            isNetworkEnabled = locationManager
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled) {
                //Nenhum provedor de rede está habilitado
            } else {
                this.canGetLocation = true;
                // Primeiro localização obter de provedor de rede
                if (isNetworkEnabled) {
                    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;
    }

    //eric

    /**
     * para de usar GPS listener
     * Calling this function will stop using GPS in your app
     * */
    public void stopUsingGPS(){
        if(locationManager != null){
            locationManager.removeUpdates(GPSTracker.this);
        }
    }

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

        // return latitude
        return latitude;
    }

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

        // return longitude
        return longitude;
    }

    /**
     * Função para verificar GPS / Wi-Fi habilitado
     * @return boolean
     * */
    public boolean canGetLocation() {
        return this.canGetLocation;
    }

    /**
     * Function para abrir o alerta
     * */
    public void showSettingsAlert(){
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

        // titulo da mensagem de config
        alertDialog.setTitle("Configurar GPS");

        // mensagem de configuração
        alertDialog.setMessage("GPS não Ativado. Você deseja abrir o menu de configuração?");

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

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

        // Exibir alerta de mensagem
        alertDialog.show();
    }

    @Override
    public void onLocationChanged(Location location) {
        getLocation();
    }

    @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;
    }
}

And then to get the data into your MainActivity, for example (by clicking a button):

// clicando no botao
btnShowLocation.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View arg0) {        
        // instancia o service, GPSTracker gps
        gps = new GPSTracker(MainActivity.this);

        // verifica ele    
        if (gps.canGetLocation()) {
            // passa sua latitude e longitude para duas variaveis
            double latitude = gps.getLatitude();
            double longitude = gps.getLongitude();

            // e mostra no Toast
            Toast.makeText(getApplicationContext(), "Sua localização - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
        }
    }
});

And remember, don’t forget the permissions:

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