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/*
* Copyright (C) 2012 The CyanogenMod 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.settings.profiles;
import java.io.IOException;
import java.util.UUID;
import android.app.Profile;
import android.content.Context;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.Tag;
import android.nfc.tech.Ndef;
import android.nfc.tech.NdefFormatable;
import android.os.Vibrator;
import android.util.Log;
public class NFCProfileUtils {
private static final String TAG = "NFCUtils";
private static final long[] VIBRATION_PATTERN = {
0, 100, 10000
};
public static void vibrate(Context context) {
Vibrator vibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
vibrator.vibrate(VIBRATION_PATTERN, -1);
}
/*
* Writes an NdefMessage to a NFC tag
*/
public static boolean writeTag(NdefMessage message, Tag tag) {
int size = message.toByteArray().length;
try {
Ndef ndef = Ndef.get(tag);
if (ndef != null) {
ndef.connect();
if (!ndef.isWritable()) {
Log.e(TAG, "Tag is not writable!");
return false;
}
if (ndef.getMaxSize() < size) {
Log.e(TAG,
"Tag exceeds max ndef message size! [" + size + " > "
+ ndef.getMaxSize() + "]");
return false;
}
ndef.writeNdefMessage(message);
return true;
} else {
NdefFormatable format = NdefFormatable.get(tag);
if (format != null) {
try {
format.connect();
format.format(message);
return true;
} catch (IOException e) {
Log.e(TAG, "Write error!", e);
return false;
}
} else {
return false;
}
}
} catch (Exception e) {
Log.e(TAG, "Write error!", e);
return false;
}
}
/* Convert a 16-byte array to a UUID */
static UUID toUUID(byte[] byteArray) {
long msb = 0;
long lsb = 0;
for (int i = 0; i < 8; i++) {
msb = (msb << 8) | (byteArray[i] & 0xff);
}
for (int i = 8; i < 16; i++) {
lsb = (lsb << 8) | (byteArray[i] & 0xff);
}
UUID result = new UUID(msb, lsb);
return result;
}
/* Convert a UUID to a 16-byte array */
static byte[] asByteArray(UUID uuid) {
long msb = uuid.getMostSignificantBits();
long lsb = uuid.getLeastSignificantBits();
byte[] buffer = new byte[16];
for (int i = 0; i < 8; i++) {
buffer[i] = (byte) (msb >>> 8 * (7 - i));
}
for (int i = 8; i < 16; i++) {
buffer[i] = (byte) (lsb >>> 8 * (7 - i));
}
return buffer;
}
/*
* Convert a profiles into an NdefMessage. The profile UUID is 16 bytes and
* stored with the cm/profile mimetype
*/
public static NdefMessage getProfileAsNdef(Profile profile) {
byte[] profileBytes = NFCProfileUtils.asByteArray(profile.getUuid());
NdefRecord record = NdefRecord.createMime(NFCProfile.PROFILE_MIME_TYPE, profileBytes);
return new NdefMessage(new NdefRecord[] { record });
}
}
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