CardReader/CardReaderFragment.cs

﻿/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

using System;
using System.Xml;

using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;
using Android.Nfc;
using Android.Nfc.Tech;

using CommonSampleLibrary;

namespace CardReader
{
	/**
	 * Generic UI for sample discovery.
	 */
	public class CardReaderFragment : Fragment, LoyaltyCardReader.AccountCallback
	{

		public string TAG {
			get { return "CardReaderFragment"; }
		}
		// Recommend NfcAdapter flags for reading from other Android devices. Indicates that this
		// activity is interested in NFC-A devices (including other Android devices), and that the
		// system should not check for the presence of NDEF-formatted data (e.g. Android Beam).
		public NfcReaderFlags READER_FLAGS = NfcReaderFlags.NfcA | NfcReaderFlags.SkipNdefCheck;
		public LoyaltyCardReader mLoyaltyCardReader;
		private TextView mAccountField;

		public override void OnCreate (Bundle savedInstanceState)
		{
			base.OnCreate (savedInstanceState);
		}

		public override View OnCreateView (LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState)
		{
			// Inflate the layout for this fragment
			View v = inflater.Inflate(Resource.Layout.main_fragment, container, false);
			if (v != null) {
				mAccountField = (TextView) v.FindViewById(Resource.Id.card_account_field);
				mAccountField.Text = "Waiting...";

				mLoyaltyCardReader = new LoyaltyCardReader (new WeakReference<LoyaltyCardReader.AccountCallback>(this));

				// Disable Android Beam and register our card reader callback
				EnableReaderMode ();
			}
			return v;
		}

		public override void OnPause ()
		{
			base.OnPause ();
			DisableReaderMode ();
		}

		public override void OnResume ()
		{
			base.OnResume ();
			EnableReaderMode ();
		}

		private void EnableReaderMode ()
		{
			Log.Info (TAG, "Enabling reader mode");
			Activity activity = this.Activity;
			NfcAdapter nfc = NfcAdapter.GetDefaultAdapter (activity);
			if (nfc != null)
			{
				nfc.EnableReaderMode(activity, mLoyaltyCardReader, READER_FLAGS , null);
			}
		}

		private void DisableReaderMode ()
		{
			Log.Info (TAG, "Enabling reader mode");
			Activity activity = this.Activity;
			NfcAdapter nfc = NfcAdapter.GetDefaultAdapter (activity);
			if (nfc != null)
			{
				nfc.DisableReaderMode(activity);
			}
		}


		#region AccountCallback implementation
		// This callback is run on a background thread, but updates to UI elements must be performed
		// on the UI thread.
		public void OnAccountRecieved (string account)
		{
			this.Activity.RunOnUiThread (() => mAccountField.Text = account);
		}

		#endregion
	}
}