当前位置出错?

我想知道我现在的位置

locationListener = new LocationListener() {

            @Override
            public void onLocationChanged(Location loc) {

                loc.getLatitude();
                loc.getLongitude();

                LatLng coordinate = new LatLng(loc.getLatitude(), loc.getLongitude());
                CameraUpdate currentLocation = CameraUpdateFactory
                        .newLatLngZoom(coordinate, 16);
                mMap.animateCamera(currentLocation);

                String Text = "My current location is: " +
                        "Latitude = " + loc.getLatitude() +
                        "Longitude = " + loc.getLongitude();
                Log.d("Dana","acc="+loc.getAccuracy());

                Toast.makeText(getApplicationContext(), Text, Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onProviderDisabled(String provider) {
                Toast.makeText(getApplicationContext(), "Gps Disabled", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onProviderEnabled(String provider) {
                Toast.makeText(getApplicationContext(), "Gps Enabled", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onStatusChanged(String provider, int status, Bundle extras) {

            }
        };
        locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED
                && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                    1);
            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
                    1);
        }
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
                0, 0, locationListener);

但在模拟器和我的真实设备上,我的位置在英国的某个地方,即使我的手机已经激活了位置。为什么会这样?为什么不检索我当前的真实位置?我已经记录了准确度,只有20。。。

此外,是否有方法存储该位置,即使活动已关闭?因为我已经看到,当我关闭活动并重新打开时,它不会再次调用onLocationChanged函数。