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/*
* Copyright (C) 2011 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.
*/
package com.android.contacts;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.Context;
import android.net.Uri;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.NfcEvent;
import android.provider.ContactsContract.Contacts;
import android.provider.ContactsContract.Profile;
import android.util.Log;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* This class implements sharing the currently displayed
* contact to another device using NFC. NFC sharing is only
* enabled when the activity is in the foreground and resumed.
* When an NFC link is established, {@link #createMessage}
* will be called to create the data to be sent over the link,
* which is a vCard in this case.
*/
public class NfcHandler implements NfcAdapter.CreateNdefMessageCallback {
private static final String TAG = "ContactNfcHandler";
private static final String PROFILE_LOOKUP_KEY = "profile";
private final Context mContext;
private final Uri mContactUri;
/* Register NFC handler. This should be called in activities' onCreate(), or similar methods */
public static void register(Activity activity, Uri contactUri) {
NfcAdapter adapter = NfcAdapter.getDefaultAdapter(activity.getApplicationContext());
if (adapter == null) {
return; // NFC not available on this device
}
adapter.setNdefPushMessageCallback(new NfcHandler(activity, contactUri), activity);
}
public NfcHandler(Context context, Uri contactUri) {
mContext = context;
mContactUri = contactUri;
}
@Override
public NdefMessage createNdefMessage(NfcEvent event) {
ContentResolver resolver = mContext.getContentResolver();
if (mContactUri != null) {
final String lookupKey = Uri.encode(mContactUri.getPathSegments().get(2));
final Uri shareUri;
// TODO find out where to get this constant from, or find another way
// of determining this.
if (lookupKey.equals(PROFILE_LOOKUP_KEY)) {
shareUri = Profile.CONTENT_VCARD_URI.buildUpon().
appendQueryParameter(Contacts.QUERY_PARAMETER_VCARD_NO_PHOTO, "true").
build();
} else {
shareUri = Contacts.CONTENT_VCARD_URI.buildUpon().
appendPath(lookupKey).
appendQueryParameter(Contacts.QUERY_PARAMETER_VCARD_NO_PHOTO, "true").
build();
}
ByteArrayOutputStream ndefBytes = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int r;
try {
InputStream vcardInputStream = resolver.openInputStream(shareUri);
while ((r = vcardInputStream.read(buffer)) > 0) {
ndefBytes.write(buffer, 0, r);
}
NdefRecord record = NdefRecord.createMime("text/x-vcard", ndefBytes.toByteArray());
return new NdefMessage(record);
} catch (IOException e) {
Log.e(TAG, "IOException creating vcard.");
return null;
}
} else {
Log.w(TAG, "No contact URI to share.");
return null;
}
}
}
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