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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.cardreader;
     18 
     19 import android.app.Activity;
     20 import android.nfc.NfcAdapter;
     21 import android.os.Bundle;
     22 import android.support.v4.app.Fragment;
     23 import android.view.LayoutInflater;
     24 import android.view.View;
     25 import android.view.ViewGroup;
     26 import android.widget.TextView;
     27 
     28 import com.example.android.common.logger.Log;
     29 
     30 /**
     31  * Generic UI for sample discovery.
     32  */
     33 public class CardReaderFragment extends Fragment implements LoyaltyCardReader.AccountCallback {
     34 
     35     public static final String TAG = "CardReaderFragment";
     36     // Recommend NfcAdapter flags for reading from other Android devices. Indicates that this
     37     // activity is interested in NFC-A devices (including other Android devices), and that the
     38     // system should not check for the presence of NDEF-formatted data (e.g. Android Beam).
     39     public static int READER_FLAGS =
     40             NfcAdapter.FLAG_READER_NFC_A | NfcAdapter.FLAG_READER_SKIP_NDEF_CHECK;
     41     public LoyaltyCardReader mLoyaltyCardReader;
     42     private TextView mAccountField;
     43 
     44     /** Called when sample is created. Displays generic UI with welcome text. */
     45     @Override
     46     public void onCreate(Bundle savedInstanceState) {
     47         super.onCreate(savedInstanceState);
     48     }
     49 
     50     @Override
     51     public View onCreateView(LayoutInflater inflater, ViewGroup container,
     52                              Bundle savedInstanceState) {
     53         // Inflate the layout for this fragment
     54         View v = inflater.inflate(R.layout.main_fragment, container, false);
     55         if (v != null) {
     56             mAccountField = (TextView) v.findViewById(R.id.card_account_field);
     57             mAccountField.setText("Waiting...");
     58 
     59             mLoyaltyCardReader = new LoyaltyCardReader(this);
     60 
     61             // Disable Android Beam and register our card reader callback
     62             enableReaderMode();
     63         }
     64 
     65         return v;
     66     }
     67 
     68     @Override
     69     public void onPause() {
     70         super.onPause();
     71         disableReaderMode();
     72     }
     73 
     74     @Override
     75     public void onResume() {
     76         super.onResume();
     77         enableReaderMode();
     78     }
     79 
     80     private void enableReaderMode() {
     81         Log.i(TAG, "Enabling reader mode");
     82         Activity activity = getActivity();
     83         NfcAdapter nfc = NfcAdapter.getDefaultAdapter(activity);
     84         if (nfc != null) {
     85             nfc.enableReaderMode(activity, mLoyaltyCardReader, READER_FLAGS, null);
     86         }
     87     }
     88 
     89     private void disableReaderMode() {
     90         Log.i(TAG, "Disabling reader mode");
     91         Activity activity = getActivity();
     92         NfcAdapter nfc = NfcAdapter.getDefaultAdapter(activity);
     93         if (nfc != null) {
     94             nfc.disableReaderMode(activity);
     95         }
     96     }
     97 
     98     @Override
     99     public void onAccountReceived(final String account) {
    100         // This callback is run on a background thread, but updates to UI elements must be performed
    101         // on the UI thread.
    102         getActivity().runOnUiThread(new Runnable() {
    103             @Override
    104             public void run() {
    105                 mAccountField.setText(account);
    106             }
    107         });
    108     }
    109 }
    110