| /* |
| * 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.android.apps.tag.record.UriRecord.UriRecordEditInfo; |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Preconditions; |
| import com.google.common.primitives.Bytes; |
| |
| import android.app.Activity; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.pm.PackageManager; |
| import android.content.pm.ResolveInfo; |
| import android.net.Uri; |
| import android.nfc.NdefRecord; |
| import android.os.Parcel; |
| import android.os.Parcelable; |
| import android.text.TextUtils; |
| import android.view.LayoutInflater; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.ImageView; |
| import android.widget.TextView; |
| |
| import java.io.UnsupportedEncodingException; |
| import java.nio.charset.Charset; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.Locale; |
| |
| /** |
| * An NFC Text Record |
| */ |
| public class TextRecord extends ParsedNdefRecord { |
| |
| public static final String RECORD_TYPE = "TextRecord"; |
| |
| /** 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 View getView(Activity activity, LayoutInflater inflater, ViewGroup parent, int offset) { |
| TextView text = (TextView) inflater.inflate(R.layout.tag_text, parent, false); |
| text.setText(mText); |
| return text; |
| } |
| |
| @Override |
| public String getSnippet(Context context, Locale locale) { |
| return mText; |
| } |
| |
| 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} |
| */ |
| @VisibleForTesting |
| public String getLanguageCode() { |
| return mLanguageCode; |
| } |
| |
| @Override |
| public RecordEditInfo getEditInfo(Activity host) { |
| return new TextRecordEditInfo(mText); |
| } |
| |
| /** |
| * Returns a view in a list of record types for adding new records to a message. |
| */ |
| public static View getAddView(Context context, LayoutInflater inflater, ViewGroup parent) { |
| ViewGroup root = (ViewGroup) inflater.inflate( |
| R.layout.tag_add_record_list_item, parent, false); |
| ((ImageView) root.findViewById(R.id.image)).setImageResource(R.drawable.ic_launcher_nfc); |
| ((TextView) root.findViewById(R.id.text)).setText(context.getString(R.string.tag_text)); |
| |
| root.setTag(new TextRecordEditInfo("")); |
| return root; |
| } |
| |
| // 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; |
| } |
| } |
| |
| @VisibleForTesting |
| public static NdefRecord newTextRecord(String text, Locale locale) { |
| return newTextRecord(text, locale, true); |
| } |
| |
| public static NdefRecord newTextRecord(String text, Locale locale, boolean encodeInUtf8) { |
| Preconditions.checkNotNull(text); |
| Preconditions.checkNotNull(locale); |
| |
| byte[] langBytes = locale.getLanguage().getBytes(Charset.forName("US-ASCII")); |
| |
| Charset utfEncoding = encodeInUtf8 ? Charset.forName("UTF-8") : Charset.forName("UTF-16"); |
| byte[] textBytes = text.getBytes(utfEncoding); |
| |
| int utfBit = encodeInUtf8 ? 0 : (1 << 7); |
| char status = (char) (utfBit + langBytes.length); |
| |
| byte[] data = Bytes.concat( |
| new byte[] { (byte) status }, |
| langBytes, |
| textBytes |
| ); |
| |
| return new NdefRecord(NdefRecord.TNF_WELL_KNOWN, NdefRecord.RTD_TEXT, new byte[0], data); |
| } |
| |
| public static class TextRecordEditInfo extends AbstractTextRecordEditInfo { |
| public TextRecordEditInfo(String text) { |
| super(text); |
| } |
| |
| public TextRecordEditInfo(Parcel in) { |
| super(in); |
| } |
| |
| @Override |
| public int getLayoutId() { |
| return R.layout.tag_edit_text; |
| } |
| |
| @Override |
| public NdefRecord getValue() { |
| String text = getCurrentText(); |
| if (TextUtils.isEmpty(text)) text = ""; |
| return TextRecord.newTextRecord(text, Locale.getDefault(), true); |
| } |
| |
| public static final Parcelable.Creator<TextRecordEditInfo> CREATOR = |
| new Parcelable.Creator<TextRecordEditInfo>() { |
| @Override |
| public TextRecordEditInfo createFromParcel(Parcel in) { |
| return new TextRecordEditInfo(in); |
| } |
| |
| @Override |
| public TextRecordEditInfo[] newArray(int size) { |
| return new TextRecordEditInfo[size]; |
| } |
| }; |
| } |
| } |