Ajouter la géolocation à votre application Android (1/2)

compile 'com.google.android.gms:play-services-location:11.0.2'

compile 'com.karumi:dexter:4.1.0'

task.addOnSuccessListener(this, new OnSuccessListener<LocationSettingsResponse>() {
    @Override
    public void onSuccess(LocationSettingsResponse locationSettingsResponse) {
        // All location settings are convenient.
        // Call getLastLocation() method here
            }
});

task.addOnFailureListener(this, new OnFailureListener() {
    @Override
    public void onFailure(@NonNull Exception e) {
        int statusCode = ((ApiException) e).getStatusCode();
        switch (statusCode) {
            case CommonStatusCodes.RESOLUTION_REQUIRED:
                // Location settings are not satisfied, but this can be fixed
                // by showing the user a dialog.
                try {
                    // Show the dialog by calling startResolutionForResult(),
                    // Then check the result in onActivityResult().
                    ResolvableApiException resolvable = (ResolvableApiException) e;
                    resolvable.startResolutionForResult(MainActivity.this,
                            REQUEST_CHECK_SETTINGS);
                } catch (IntentSender.SendIntentException sendEx) {
                    // Ignore this error.
                }
                break;
            case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
                // Location settings are not satisfied. However, we have no way
                // to fix the settings so we will not show the dialog.
                break;
        }
    }
});

public class MainActivity extends AppCompatActivity {

    private static final int REQUEST_CHECK_SETTINGS = 920;
    private FusedLocationProviderClient fusedLocationProviderClient;

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

        // Create an instance of the Fused Location Provider Client
        fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);
    }

    @Override
    protected void onResume() {
        super.onResume();
        getLocationSettings();

    }

    private void getUserCurrentLocation() {
        // Manage permissions at runtime for Android M
        Dexter.withActivity(this).withPermission(Manifest.permission.ACCESS_COARSE_LOCATION)
                .withListener(new PermissionListener() {
                    @SuppressLint("MissingPermission")
                    @Override
                    public void onPermissionGranted(PermissionGrantedResponse response) {
                        getLastKnownLocation();

                    }

                    @Override
                    public void onPermissionDenied(PermissionDeniedResponse response) {
                    }

                    @Override
                    public void onPermissionRationaleShouldBeShown(PermissionRequest permission, PermissionToken token) {
                    }
                })
                .check();
    }

    @SuppressLint("MissingPermission")
    private void getLastKnownLocation() {
        // call getLastLocation
        fusedLocationProviderClient.getLastLocation().addOnSuccessListener(new OnSuccessListener<Location>() {
            @Override
            public void onSuccess(Location location) {
                if (location != null) {
                    // Display the current location on the device screen
                    Toast.makeText(MainActivity.this, "Latitude is :" + location.getLatitude() + " and Longitude is: " + location.getLongitude(), Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(MainActivity.this, "Cannot get user current location at the moment", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }


    protected void getLocationSettings() {

        // Create a location request
        LocationRequest mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(9000);
        mLocationRequest.setFastestInterval(4000);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

        // Get current location settings
        LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
                .addLocationRequest(mLocationRequest);

        // Check if current location settings are convenient
        SettingsClient client = LocationServices.getSettingsClient(this);
        Task<LocationSettingsResponse> task = client.checkLocationSettings(builder.build());

        // Add callback to location request task
        task.addOnFailureListener(this, new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                int statusCode = ((ApiException) e).getStatusCode();
                switch (statusCode) {
                    case CommonStatusCodes.RESOLUTION_REQUIRED:
                        // Location settings are not satisfied, but this can be fixed
                        // by showing the user a dialog.
                        try {
                            // Show the dialog by calling startResolutionForResult(),
                            // and check the result in onActivityResult().
                            ResolvableApiException resolvable = (ResolvableApiException) e;
                            resolvable.startResolutionForResult(MainActivity.this,
                                    REQUEST_CHECK_SETTINGS);
                        } catch (IntentSender.SendIntentException sendEx) {
                            // Ignore the error.
                        }
                        break;
                    case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
                        // Location settings are not satisfied. However, we have no way
                        // to fix the settings so we will not show the dialog.
                        break;
                }
            }
        });


        task.addOnSuccessListener(this, new OnSuccessListener<LocationSettingsResponse>() {
            @Override
            public void onSuccess(LocationSettingsResponse locationSettingsResponse) {
                // All location settings are satisfied. The client can initialize
                // location requests here.
                getUserCurrentLocation();
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_CHECK_SETTINGS) {
            if (resultCode == RESULT_OK) {
                getUserCurrentLocation();
            }
        }
    }
}