CardReaderFragment.java

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
}