Android LocationServices.FusedLocationApi deprecated

Original Answer

This is happening because FusedLocationProviderApi deprecated in a recent version of google play services. You can check it here. The official guide now suggests using FusedLocationProviderClient. You can find the detailed guide here.

for e.g inside onCreate() or onViewCreated() create a FusedLocationProviderClient instance

Kotlin

val fusedLocationClient = LocationServices.getFusedLocationProviderClient(requireContext())

and for requesting the last known location all you have to do is call

fusedLocationClient.lastLocation.addOnSuccessListener { location: Location? ->
            location?.let { it: Location ->
                // Logic to handle location object
            } ?: kotlin.run {
                // Handle Null case or Request periodic location update https://developer.android.com/training/location/receive-location-updates
            }
        }

Java

FusedLocationProviderClient fusedLocationClient = LocationServices.getFusedLocationProviderClient(requireContext());

and

fusedLocationClient.getLastLocation().addOnSuccessListener(requireActivity(), location -> {
        if (location != null) {
            // Logic to handle location object
        } else {
            // Handle null case or Request periodic location update https://developer.android.com/training/location/receive-location-updates
        }
    });

Simple, Isn't it?

Important Update (October 24, 2017):

Yesterday Google updated its official developer page with a warning that says

Please continue using the FusedLocationProviderApi class and don't migrate to the FusedLocationProviderClient class until Google Play services version 12.0.0 is available, which is expected to ship in early 2018. Using the FusedLocationProviderClient before version 12.0.0 causes the client app to crash when Google Play services is updated on the device. We apologize for any inconvenience this may have caused.

So I think we should continue using the deprecated LocationServices.FusedLocationApi until Google resolves the issue.

Latest Update (November 21, 2017):

The warning is gone now. Google Play services 11.6 November 6, 2017, release note says : I think Play Services won't crash when it updates itself in the background. So we can use new FusedLocationProviderClient now.

Use this method

mFusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.myLooper());

In Detail Refer My This Answer

Yes, it's deprecated!
Here are some points you'll need while using new FusedLocationProviderClient.

1. import it as import com.google.android.gms.location.FusedLocationProviderClient;
2. I notice that you are implementing LocationListener interface. In the mFusedLocationClient.requestLocationUpdates() method, now it doesn't take a LocationListener as a parameter. You can provide LocationCallback. As this is an abstract class you can't implement it like LocationListener. Make a callback method and pass it instead of 'this' as mentioned in Google's guide. import it as import com.google.android.gms.location.LocationCallback;
3. With LocationCallback, you'll have onLocationResult() instead of onLocationChanged(). It returns LocationResult object instead of Location object. Use LocationResult.getLastLocation() to get the most recent location available in this result object. Import it as import com.google.android.gms.location.LocationResult;

Yes, it has been deprecated. FusedLocationProviderClient is easier than FusedLocationProviderApi, because FusedLocationProviderApiusually requires GoogleApiClient too, which we need to connect to Google Play Service manually. If you previously used GoogleApiClient, now GoogleApiClientis no longer needed (more here).

To get last location, can use this function:

import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.tasks.OnCompleteListener;

public class MainActivity extends AppCompatActivity{
//before public class MainActivity extends AppCompatActivity implements LocationListener,...,...


private static final String TAG = "MainActivity";
public static final int MY_PERMISSIONS_REQUEST_FINE_LOCATION = 101;
private FusedLocationProviderClient mFusedLocationClient;
private Location mGetedLocation;

private double currentLat, currentLng;

private void getLastLocation() {
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            requestPermissions(new String[] {Manifest.permission.ACCESS_FINE_LOCATION}, MY_PERMISSIONS_REQUEST_FINE_LOCATION);
        }
        return;
    }
    mFusedLocationClient.getLastLocation()
            .addOnCompleteListener(this, new OnCompleteListener<Location>() {
                @Override
                public void onComplete(@NonNull Task<Location> task) {
                    if (task.isSuccessful() && task.getResult() != null) {
                        mGetedLocation = task.getResult();
                        currentLat = mGetedLocation.getLatitude();
                        currentLng = mGetedLocation.getLongitude();
                        //updateUI();
                    }else{
                        Log.e(TAG, "no location detected");
                        Log.w(TAG, "getLastLocation:exception", task.getException());
                    }
                }
            });

}

use getFusedLocationProviderClient instead LocationServices.FusedLocationApi.

Kotlin

activity?.let { activity ->
      val client = LocationServices.getFusedLocationProviderClient(activity)
           client.lastLocation.addOnCompleteListener(activity, OnCompleteListener<Location> {
              // it.result.latitude
              // it.result.longitude
      })
}

java

FusedLocationProviderClient client =
        LocationServices.getFusedLocationProviderClient(this);

// Get the last known location
client.getLastLocation()
        .addOnCompleteListener(this, new OnCompleteListener<Location>() {
            @Override
            public void onComplete(@NonNull Task<Location> task) {
                // ...
            }
        });