问谷歌地图的加速检测在android studio中不起作用

EN

public abstract class Mapa extends FragmentActivity implements OnMapReadyCallback, SensorEventListener {

    private GoogleMap mMap;

    LocationManager locationManager;
    LocationListener locationListener;

    private SensorManager sensorManager;
    Sensor accelerometer;

    private SensorManager sensorManager2;
    Sensor giroscopio;


    @RequiresApi(api = Build.VERSION_CODES.M)
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        if (requestCode == 1) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                    return;
                }
                locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
            }
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mapa);
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);

        sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_LINEAR_ACCELERATION);
        sensorManager.registerListener(Mapa.this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int i) {
    }

    @Override
    public void onSensorChanged(SensorEvent sensorEvent) {
        float acX;
        acX = sensorEvent.values[0];       
        if (acX >= 10 ){
            AlertDialog.Builder builder1 = new AlertDialog.Builder(this);
            builder1.setMessage("Warning!");
            AlertDialog mensajealerta = builder1.create();
            mensajealerta.show();
        }
    }

    @RequiresApi(api = Build.VERSION_CODES.M)
    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;

        locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        locationListener = new LocationListener() {
            @Override
            public void onLocationChanged(Location location) {
                LatLng posicion = new LatLng(location.getLatitude(), location.getLongitude());
                mMap.clear();

                mMap.addMarker(new MarkerOptions().position(posicion).title("Estás aquí!"));
                mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(posicion, 20));
            }

            @Override
            public void onStatusChanged(String s, int i, Bundle bundle) {
            }

            @Override
            public void onProviderEnabled(String s) {
            }

            @Override
            public void onProviderDisabled(String s) {
            }
        };

        if (Build.VERSION.SDK_INT < 23) {
            if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                return;
            }
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
        } else {
            if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED){

                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
            } else {               locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);

                Location ultimaPosicion = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

                LatLng posicion = new LatLng(ultimaPosicion.getLatitude(), ultimaPosicion.getLongitude());
                mMap.clear();

                mMap.addMarker(new MarkerOptions().position(posicion).title("Estás aquí!"));
                mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(posicion, 20));
            }
        }
    }
}