Android create a dialog class to open GPS settings

this example is created by Android developer example

LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
final boolean gpsEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (!gpsEnabled) new EnableGpsDialogFragment().show(getFragmentManager(), "enableGpsDialog");

private void enableLocationSettings() {
    Intent settingsIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
    startActivity(settingsIntent);
}

private class EnableGpsDialogFragment extends DialogFragment {
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        return new AlertDialog.Builder(getActivity())
            .setTitle(R.string.enable_gps)
            .setMessage(R.string.enable_gps_dialog)
            .setPositiveButton(R.string.enable_gps, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                enableLocationSettings();
            }
        })
        .create();
    }
}