Android Check Location Services With Prompt

// string to store location providers available;
private String _mProviders;

// get location providers
_mProviders = Settings.Secure.getString(getContentResolver(),
        Settings.Secure.LOCATION_PROVIDERS_ALLOWED);

// if gps is enabled and network location is disabled
if (_mProviders.contains(_GPS) && !_mProviders.contains(_NETWORK)) {

    // build a new alert dialog to inform the user that they only have
    // GPS location services
    new AlertDialog.Builder(_mContext)

            //set the message to display to the user
            .setMessage(R.string.onlyGPS)

            // add the 'positive button' to the dialog and give it a
            // click listener
            .setPositiveButton(R.string.enableLocationServices,
                    new DialogInterface.OnClickListener() {
                        // setup what to do when clicked
                        public void onClick(DialogInterface dialog,
                                int id) {
                            // start the settings menu on the correct
                            // screen for the user
                            startActivity(new Intent(
                                    Settings.ACTION_LOCATION_SOURCE_SETTINGS));
                        }

                        // add the 'negative button' to the dialog and
                        // give it a click listener
                    })
            .setNegativeButton(R.string.close,
                    new DialogInterface.OnClickListener() {
                        // setup what to do when clicked
                        public void onClick(DialogInterface dialog,
                                int id) {
                            // remove the dialog
                            dialog.cancel();
                        }

                        // finish creating the dialog and show to the
                        // user
                    }).create().show();

    // if gps is disabled and network location services are enabled
} else if (!_mProviders.contains(_GPS)
        && _mProviders.contains(_NETWORK)) {

    // do nothing at present...

    // if gps is disabled and network location services are disabled
} else if (!_mProviders.contains(_GPS)
        && !_mProviders.contains(_NETWORK)) {

    // build a new alert dialog to inform the user that they have no
    // location services enabled
    new AlertDialog.Builder(_mContext)

            //set the message to display to the user
            .setMessage(R.string.noLocationServices)

            // add the 'positive button' to the dialog and give it a
            // click listener
            .setPositiveButton(R.string.enableLocationServices,
                    new DialogInterface.OnClickListener() {
                        // setup what to do when clicked
                        public void onClick(DialogInterface dialog,
                                int id) {
                            // start the settings menu on the correct
                            // screen for the user
                            startActivity(new Intent(
                                    Settings.ACTION_LOCATION_SOURCE_SETTINGS));
                        }

                        // add the 'negative button' to the dialog and
                        // give it a click listener
                    })
            .setNegativeButton(R.string.close,
                    new DialogInterface.OnClickListener() {
                        // setup what to do when clicked
                        public void onClick(DialogInterface dialog,
                                int id) {
                            // remove the dialog
                            dialog.cancel();
                        }

                        // finish creating the dialog and show to the
                        // user
                    }).create().show();
}