1/*
2 * Copyright (C) 2011 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
17package com.android.contacts;
18
19import com.android.contacts.detail.ContactDetailFragment;
20
21import android.app.Activity;
22import android.content.ContentResolver;
23import android.net.Uri;
24import android.nfc.NdefMessage;
25import android.nfc.NdefRecord;
26import android.nfc.NfcAdapter;
27import android.nfc.NfcEvent;
28import android.provider.ContactsContract.Contacts;
29import android.provider.ContactsContract.Profile;
30
31import android.util.Log;
32
33import java.io.ByteArrayOutputStream;
34import java.io.IOException;
35import java.io.InputStream;
36
37/**
38  * This class implements sharing the currently displayed
39  * contact to another device using NFC. NFC sharing is only
40  * enabled when the activity is in the foreground and resumed.
41  * When an NFC link is established, {@link #createMessage}
42  * will be called to create the data to be sent over the link,
43  * which is a vCard in this case.
44  */
45public class NfcHandler implements NfcAdapter.CreateNdefMessageCallback {
46
47    private static final String TAG = "ContactNfcHandler";
48    private static final String PROFILE_LOOKUP_KEY = "profile";
49    private final ContactDetailFragment mContactFragment;
50
51    public static void register(Activity activity, ContactDetailFragment contactFragment) {
52        NfcAdapter adapter = NfcAdapter.getDefaultAdapter(activity.getApplicationContext());
53        if (adapter == null) {
54            return;  // NFC not available on this device
55        }
56        adapter.setNdefPushMessageCallback(new NfcHandler(contactFragment), activity);
57    }
58
59    public NfcHandler(ContactDetailFragment contactFragment) {
60        mContactFragment = contactFragment;
61    }
62
63    @Override
64    public NdefMessage createNdefMessage(NfcEvent event) {
65        // Get the current contact URI
66        Uri contactUri = mContactFragment.getUri();
67        ContentResolver resolver = mContactFragment.getActivity().getContentResolver();
68        if (contactUri != null) {
69            final String lookupKey = Uri.encode(contactUri.getPathSegments().get(2));
70            final Uri shareUri;
71            // TODO find out where to get this constant from, or find another way
72            // of determining this.
73            if (lookupKey.equals(PROFILE_LOOKUP_KEY)) {
74                shareUri = Profile.CONTENT_VCARD_URI.buildUpon().
75                appendQueryParameter(Contacts.QUERY_PARAMETER_VCARD_NO_PHOTO, "true").
76                build();
77            } else {
78                shareUri = Contacts.CONTENT_VCARD_URI.buildUpon().
79                appendPath(lookupKey).
80                appendQueryParameter(Contacts.QUERY_PARAMETER_VCARD_NO_PHOTO, "true").
81                build();
82            }
83            ByteArrayOutputStream ndefBytes = new ByteArrayOutputStream();
84            byte[] buffer = new byte[1024];
85            int r;
86            try {
87                InputStream vcardInputStream = resolver.openInputStream(shareUri);
88                while ((r = vcardInputStream.read(buffer)) > 0) {
89                    ndefBytes.write(buffer, 0, r);
90                }
91
92                NdefRecord vcardRecord = new NdefRecord(NdefRecord.TNF_MIME_MEDIA,
93                        "text/x-vCard".getBytes(), new byte[]{}, ndefBytes.toByteArray());
94                return new NdefMessage(new NdefRecord[] {vcardRecord});
95            } catch (IOException e) {
96                Log.e(TAG, "IOException creating vcard.");
97                return null;
98            }
99        } else {
100            Log.w(TAG, "No contact URI to share.");
101            return null;
102        }
103    }
104}
105