/**
	 * Check whether Google Play Services are available.
	 * 
	 * If not, then display dialog allowing user to update Google Play Services
	 * 
	 * @return true if available, or false if not
	 */
	private boolean checkGooglePlayServicesAvailable()
	{
		final int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());
		if (status == ConnectionResult.SUCCESS)
		{
			return true;
		}

		Log.e(LOGTAG, "Google Play Services not available: " + GooglePlayServicesUtil.getErrorString(status));
		
		if (GooglePlayServicesUtil.isUserRecoverableError(status))
		{
			final Dialog errorDialog = GooglePlayServicesUtil.getErrorDialog(status, this, 1);
			if (errorDialog != null)
			{
				errorDialog.show();
			}
		}

		return false;
	}