| /* |
| * Copyright (C) 2010 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.apps.tag.record; |
| |
| import com.android.apps.tag.R; |
| import com.google.common.base.Preconditions; |
| |
| import android.app.Activity; |
| import android.nfc.NdefRecord; |
| import android.view.LayoutInflater; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.TextView; |
| |
| import java.io.UnsupportedEncodingException; |
| import java.util.Arrays; |
| |
| /** |
| * An NFC Text Record |
| */ |
| public class TextRecord implements ParsedNdefRecord { |
| |
| /** ISO/IANA language code */ |
| private final String mLanguageCode; |
| private final String mText; |
| |
| private TextRecord(String languageCode, String text) { |
| mLanguageCode = Preconditions.checkNotNull(languageCode); |
| mText = Preconditions.checkNotNull(text); |
| } |
| |
| @Override |
| public String getRecordType() { |
| return "Text"; |
| } |
| |
| @Override |
| public View getView(Activity activity, LayoutInflater inflater, ViewGroup parent) { |
| TextView text = (TextView) inflater.inflate(R.layout.tag_text, parent, false); |
| text.setText(mText); |
| return text; |
| } |
| |
| public String getText() { |
| return mText; |
| } |
| |
| /** |
| * Returns the ISO/IANA language code associated with this text element. |
| * |
| * TODO: this should return a {@link java.util.Locale} |
| */ |
| public String getLanguageCode() { |
| return mLanguageCode; |
| } |
| |
| // TODO: deal with text fields which span multiple NdefRecords |
| public static TextRecord parse(NdefRecord record) { |
| Preconditions.checkArgument(record.getTnf() == NdefRecord.TNF_WELL_KNOWN); |
| Preconditions.checkArgument(Arrays.equals(record.getType(), NdefRecord.RTD_TEXT)); |
| try { |
| |
| byte[] payload = record.getPayload(); |
| |
| /* |
| * payload[0] contains the "Status Byte Encodings" field, per |
| * the NFC Forum "Text Record Type Definition" section 3.2.1. |
| * |
| * bit7 is the Text Encoding Field. |
| * |
| * if (Bit_7 == 0): The text is encoded in UTF-8 |
| * if (Bit_7 == 1): The text is encoded in UTF16 |
| * |
| * Bit_6 is reserved for future use and must be set to zero. |
| * |
| * Bits 5 to 0 are the length of the IANA language code. |
| */ |
| |
| String textEncoding = ((payload[0] & 0200) == 0) ? "UTF-8" : "UTF-16"; |
| int languageCodeLength = payload[0] & 0077; |
| |
| String languageCode = new String(payload, 1, languageCodeLength, "US-ASCII"); |
| String text = new String(payload, |
| languageCodeLength + 1, |
| payload.length - languageCodeLength - 1, |
| textEncoding); |
| return new TextRecord(languageCode, text); |
| |
| } catch (UnsupportedEncodingException e) { |
| // should never happen unless we get a malformed tag. |
| throw new IllegalArgumentException(e); |
| } |
| } |
| |
| public static boolean isText(NdefRecord record) { |
| try { |
| parse(record); |
| return true; |
| } catch (IllegalArgumentException e) { |
| return false; |
| } |
| } |
| } |