How to use Google Play Services LOCATION API to get current latitude and longitude

1) Add to your AndroidManifest.xml file the ACCESS_COARSE_LOCATION & ACCESS_FINE_LOCATION:

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.appname" >

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

        <application...

2) Go to app/build.gradlefile and add the following dependency:

dependencies {
        //.....
        compile 'com.google.android.gms:play-services-location:10.0.1'
    }



3) In your activity implement the following: 

import com.google.android.gms.common.ConnectionResult;
    import com.google.android.gms.common.api.GoogleApiClient;
    import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
    import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
    import com.google.android.gms.location.LocationListener;
    import com.google.android.gms.location.LocationRequest;
    import com.google.android.gms.location.LocationServices;
    import com.google.android.gms.maps.GoogleMap;

    public class HomeActivity extends AppCompatActivity implements
            ConnectionCallbacks,
            OnConnectionFailedListener,
            LocationListener {

        //Define a request code to send to Google Play services
        private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
        private GoogleApiClient mGoogleApiClient;
        private LocationRequest mLocationRequest;
        private double currentLatitude;
        private double currentLongitude;


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

            mGoogleApiClient = new GoogleApiClient.Builder(this)
                    // The next two lines tell the new client that “this” current class will handle connection stuff
                    .addConnectionCallbacks(this)
                    .addOnConnectionFailedListener(this)
                    //fourth line adds the LocationServices API endpoint from GooglePlayServices
                    .addApi(LocationServices.API)
                    .build();

            // Create the LocationRequest object
            mLocationRequest = LocationRequest.create()
                    .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
                    .setInterval(10 * 1000)        // 10 seconds, in milliseconds
                    .setFastestInterval(1 * 1000); // 1 second, in milliseconds

        }

        @Override
        protected void onResume() {
            super.onResume();
            //Now lets connect to the API
            mGoogleApiClient.connect();
        }

        @Override
        protected void onPause() {
            super.onPause();
            Log.v(this.getClass().getSimpleName(), "onPause()");

            //Disconnect from API onPause()
            if (mGoogleApiClient.isConnected()) {
                LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
                mGoogleApiClient.disconnect();
            }


        }

        /**
         * If connected get lat and long
         * 
         */
        @Override
        public void onConnected(Bundle bundle) {
            Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);

            if (location == null) {
                LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);

            } else {
                //If everything went fine lets get latitude and longitude
                currentLatitude = location.getLatitude();
                currentLongitude = location.getLongitude();

                Toast.makeText(this, currentLatitude + " WORKS " + currentLongitude + "", Toast.LENGTH_LONG).show();
            }
        }


        @Override
        public void onConnectionSuspended(int i) {}

        @Override
        public void onConnectionFailed(ConnectionResult connectionResult) {
            /*
             * Google Play services can resolve some errors it detects.
             * If the error has a resolution, try sending an Intent to
             * start a Google Play services activity that can resolve
             * error.
             */
            if (connectionResult.hasResolution()) {
                try {
                    // Start an Activity that tries to resolve the error
                    connectionResult.startResolutionForResult(this, CONNECTION_FAILURE_RESOLUTION_REQUEST);
                    /*
                     * Thrown if Google Play services canceled the original
                     * PendingIntent
                     */
                } catch (IntentSender.SendIntentException e) {
                    // Log the error
                    e.printStackTrace();
                }
            } else {
                /*
                 * If no resolution is available, display a dialog to the
                 * user with the error.
                 */
                Log.e("Error", "Location services connection failed with code " + connectionResult.getErrorCode());
            }
        }

        /**
         * If locationChanges change lat and long
         * 
         * 
         * @param location
         */
        @Override
        public void onLocationChanged(Location location) {
            currentLatitude = location.getLatitude();
            currentLongitude = location.getLongitude();

            Toast.makeText(this, currentLatitude + " WORKS " + currentLongitude + "", Toast.LENGTH_LONG).show();
        }


    }