CODEWITHSUNDEEP
javaandroidgps
Rehan Yousaf
Rehan Yousaf

Reputation: 245

How can I get the current GPS location?

I know that this has been asked before but all the solutions available require me to use onLocationChanged() method so I can use the getLatitude() and getLongitude() methods to get coordinates.

But onLocationChanged() will be called when the location of my device is changed. So in order to get my current location I would have to move my device.

But I want to get the current coordinates without having to move my device. Also I read somewhere that I can call the onLocationChanged() method manually and I can get the last known location but again. Isn't it possible that the last known location won't be my current location? or is it ok to use the last known location solution?

This is part of a class that I am using to implement LocationListener.

public class MyLocListener extends MapsActivity implements LocationListener {

    public void onLocationChanged(Location location)
    {
        if(location!=null)
        {
            MapsActivity.setLatitude(location.getLatitude());
            MapsActivity.setLongitude(location.getLongitude());
        }
    }}

This is the override of the function I am using to provide coordinates to my map activity. latitude and longitude are two double type variables. In this class the latitude and longitude variables are initiated with 0 and they remain that way since the onLocationChanged() function is only called when my location is changed. Hence I can't see my current location on the map.

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


        LocationManager myLocManager;

        myLocManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        MyLocListener loc = new MyLocListener();
        if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_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;
        }
        myLocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, loc);

        LatLng sydney = new LatLng(latitude, longitude);

        mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
    }

Upvotes: 6

Views: 65128

Answers (2)

Kushan
Kushan

Reputation: 5984

move your code inside location changed. Since getting location is asynchronous,your latitude and longitude never appear reflect. optimize the initializations as needed.

public class MyLocListener extends MapsActivity implements LocationListener {

public void onLocationChanged(Location location)
{
    if(location!=null)
    {
        MapsActivity.setLatitude(location.getLatitude());
        MapsActivity.setLongitude(location.getLongitude());

    LatLng sydney = new LatLng(location.getLatitude(), location.getLongitude);

    mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
    mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));

    }
}}

Upvotes: 0

thealeksandr
thealeksandr

Reputation: 1736

You Should use GooglePlayServices

compile 'com.google.android.gms:play-services-location:7.0.0'

To get location

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

After connection 

public class MainActivity extends ActionBarActivity implements
        ConnectionCallbacks, OnConnectionFailedListener {
    ...
    @Override
    public void onConnected(Bundle connectionHint) {
        mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
                mGoogleApiClient);
        if (mLastLocation != null) {
            mLatitudeText.setText(String.valueOf(mLastLocation.getLatitude()));
            mLongitudeText.setText(String.valueOf(mLastLocation.getLongitude()));
        }
    }
}

For more detail information check documentation.

Upvotes: 3

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