FusedLocationProviderClient when and how to stop Looper?

Question

I used to use FusedLocationApi until I learned that it is deprecated (see references below). It was simple to implement. As the documentation says you need to use it in conjunction with GoogleApiClient

LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient,
                        locationRequest, this);

I recently changed to FusedLocationProviderClient (see reference below) Following a tutorial I was able to successfully get FusedLocationProviderClient working

Tutorial: https://github.com/codepath/android_guides/wiki/Retrieving-Location-with-LocationServices-API

// new Google API SDK v11 uses getFusedLocationProviderClient(this)
getFusedLocationProviderClient(this).requestLocationUpdates(mLocationRequest, new LocationCallback() {
      @Override
      public void onLocationResult(LocationResult locationResult) {
         // do work here
         onLocationChanged(locationResult.getLastLocation();
      }
    },
    Looper.myLooper());

The issue I am running into is the Looper thread. Even with the application in the background, the Looper thread continues to run. I would like to pause location updates when the application is in the background and then resume location updates when the application is in the foreground. How can I achieve this?

References:

1. https://developers.google.com/android/reference/com/google/android/gms/location/FusedLocationProviderApi
2. https://developers.google.com/android/reference/com/google/android/gms/location/FusedLocationProviderClient

Answer 1

You just need to call mFusedLocationClient.removeLocationUpdates(mLocationCallback) in onPause() of your Activity. However, there is a bit more to it than just that.

Use member variables for the FusedLocationProviderClient and LocationRequest in your main activity:

import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationCallback;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationResult;

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

    FusedLocationProviderClient mFusedLocationClient;
    LocationRequest mLocationRequest;

    //..........

Use a member variable for the LocationCallback as well:

LocationCallback mLocationCallback = new LocationCallback(){
    @Override
    public void onLocationResult(LocationResult locationResult) {
        for (Location location : locationResult.getLocations()) {
            Log.i("MainActivity", "Location: " + location.getLatitude() + " " + location.getLongitude());

        }
    };

};

Then, assign mFusedLocationClient in onCreate() :

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

    mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
    requestLocationUpdates();

    //...............
}

Then in onResume(), if theFusedLocationProviderClient is set up, then use it.

@Override
public void onResume() {
    if (mFusedLocationClient != null) {
        requestLocationUpdates();
    }
}

public void requestLocationUpdates() {
    mLocationRequest = new LocationRequest();
    mLocationRequest.setInterval(120000); // two minute interval
    mLocationRequest.setFastestInterval(120000);
    mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
    if (ContextCompat.checkSelfPermission(this,
            Manifest.permission.ACCESS_FINE_LOCATION)
            == PackageManager.PERMISSION_GRANTED) {
        mFusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.myLooper());
    }
}

And finally, in onPause(), call removeLocationUpdates():

@Override
public void onPause() {
    super.onPause();
    if (mFusedLocationClient != null) {
        mFusedLocationClient.removeLocationUpdates(mLocationCallback);
    }
}

Answer 2

After getting location just remove mFusedLocationClient.removeLocationUpdates as he mentioned in above answers.

if (mFusedLocationClient != null) 
        mFusedLocationClient.removeLocationUpdates(mLocationCallback);

Looper will be called requestLocationUpdates until you remove it.

In my problem, I did as I mention above. Below is my code.

  mFusedLocationClient.getLastLocation()
                    .addOnSuccessListener(new OnSuccessListener<Location>() {
                        @Override
                        public void onSuccess(Location location) {
                            // GPS location can be null if GPS is switched off
                            if (location != null) {

                                mLocation = location;

                                if (mFusedLocationClient != null) {
                                    mFusedLocationClient.removeLocationUpdates(mLocationCallback);
                                }
                          } else {
                                startLocationUpdates();
                           }
                        }
                    })
                    .addOnFailureListener(new OnFailureListener() {
                        @Override
                        public void onFailure(@NonNull Exception e) {
                            Toast.makeText(HomeActivity.this, "Error trying to get last GPS location", Toast.LENGTH_SHORT).show();
                            e.printStackTrace();
                        }
                    });

and below is my requestLocationUpdates so I will get a request until the location is available.

private void startLocationUpdates() {
        mSettingsClient.checkLocationSettings(mLocationSettingsRequest)
                .addOnSuccessListener(this, new OnSuccessListener<LocationSettingsResponse>() {
                    @Override
                    public void onSuccess(LocationSettingsResponse locationSettingsResponse) {
                        Log.i(TAG, "All location settings are satisfied.");

                        getPackageManager().checkPermission(Manifest.permission.ACCESS_FINE_LOCATION, getPackageName());
                        mFusedLocationClient.requestLocationUpdates(mLocationRequest,
                                mLocationCallback, Looper.myLooper());
                        getLastLocationNewMethod();
                    }
                })
                .addOnFailureListener(this, new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        int statusCode = ((ApiException) e).getStatusCode();
                        switch (statusCode) {
                            case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
                                Log.i(TAG, "Location settings are not satisfied. Attempting to upgrade " +
                                        "location settings ");
                                try {
                                    ResolvableApiException rae = (ResolvableApiException) e;
                                    rae.startResolutionForResult(HomeActivity.this, 0x1);
                                } catch (IntentSender.SendIntentException sie) {
                                    Log.i(TAG, "PendingIntent unable to execute request.");
                                }
                                break;
                            case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
                                String errorMessage = "Location settings are inadequate, and cannot be " +
                                        "fixed here. Fix in Settings.";
                                Log.e(TAG, errorMessage);
                                Toast.makeText(HomeActivity.this, errorMessage, Toast.LENGTH_LONG).show();
                                //  mRequestingLocationUpdates = false;
                        }
                        getLastLocationNewMethod();  // this method is where I can get location. It is calling above method. 
                    }
                });
    }

Note: For more information here is GitHub Repo LINK