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 17 package com.android.cts.verifier.nfc.tech; 18 19 import com.android.cts.verifier.R; 20 21 import android.content.Context; 22 import android.nfc.FormatException; 23 import android.nfc.NdefMessage; 24 import android.nfc.NdefRecord; 25 import android.nfc.Tag; 26 import android.nfc.tech.Ndef; 27 import android.util.Log; 28 29 import java.io.IOException; 30 import java.nio.charset.Charset; 31 import java.util.Random; 32 33 /** 34 * {@link TagTester} for NDEF tags. It writes a semi-random NDEF tag with a random id but 35 * constant mime type and payload. 36 */ 37 public class NdefTagTester implements TagTester { 38 39 private static final String TAG = NdefTagTester.class.getSimpleName(); 40 41 private static final String MIME_TYPE = "application/com.android.cts.verifier.nfc"; 42 43 private static final String PAYLOAD = "CTS Verifier NDEF Tag"; 44 45 private final Context mContext; 46 NdefTagTester(Context context)47 public NdefTagTester(Context context) { 48 this.mContext = context; 49 } 50 51 @Override isTestableTag(Tag tag)52 public boolean isTestableTag(Tag tag) { 53 if (tag != null) { 54 for (String tech : tag.getTechList()) { 55 if (tech.equals(Ndef.class.getName())) { 56 Ndef ndef = Ndef.get(tag); 57 return ndef != null && ndef.isWritable(); 58 } 59 } 60 } 61 return false; 62 } 63 64 @Override writeTag(Tag tag)65 public TagVerifier writeTag(Tag tag) throws IOException, FormatException { 66 Random random = new Random(); 67 NdefRecord mimeRecord = createRandomMimeRecord(random); 68 NdefRecord[] expectedRecords = new NdefRecord[] {mimeRecord}; 69 70 final NdefMessage expectedMessage = new NdefMessage(expectedRecords); 71 writeMessage(tag, expectedMessage); 72 73 final String expectedContent = mContext.getString(R.string.nfc_ndef_content, 74 NfcUtils.displayByteArray(mimeRecord.getId()), MIME_TYPE, PAYLOAD); 75 76 return new TagVerifier() { 77 @Override 78 public Result verifyTag(Tag tag) throws IOException, FormatException { 79 String actualContent; 80 NdefMessage message = readMessage(tag); 81 NdefRecord[] records = message.getRecords(); 82 83 if (records.length > 0) { 84 NdefRecord record = records[0]; 85 actualContent = mContext.getString(R.string.nfc_ndef_content, 86 NfcUtils.displayByteArray(record.getId()), 87 new String(record.getType(), Charset.forName("US-ASCII")), 88 new String(record.getPayload(), Charset.forName("US-ASCII"))); 89 } else { 90 actualContent = null; 91 } 92 93 return new Result(expectedContent, actualContent, 94 NfcUtils.areMessagesEqual(message, expectedMessage)); 95 } 96 }; 97 } 98 99 private NdefRecord createRandomMimeRecord(Random random) { 100 byte[] mimeBytes = MIME_TYPE.getBytes(Charset.forName("US-ASCII")); 101 byte[] id = new byte[4]; 102 random.nextBytes(id); 103 byte[] payload = PAYLOAD.getBytes(Charset.forName("US-ASCII")); 104 return new NdefRecord(NdefRecord.TNF_MIME_MEDIA, mimeBytes, id, payload); 105 } 106 107 private void writeMessage(Tag tag, NdefMessage message) throws IOException, FormatException { 108 Ndef ndef = null; 109 try { 110 ndef = Ndef.get(tag); 111 ndef.connect(); 112 ndef.writeNdefMessage(message); 113 } finally { 114 if (ndef != null) { 115 try { 116 ndef.close(); 117 } catch (IOException e) { 118 Log.e(TAG, "IOException while closing NDEF...", e); 119 } 120 } 121 } 122 } 123 124 private NdefMessage readMessage(Tag tag) throws IOException, FormatException { 125 Ndef ndef = null; 126 try { 127 ndef = Ndef.get(tag); 128 if (ndef != null) { 129 ndef.connect(); 130 return ndef.getNdefMessage(); 131 } 132 } finally { 133 if (ndef != null) { 134 try { 135 ndef.close(); 136 } catch (IOException e) { 137 Log.e(TAG, "Error closing Ndef...", e); 138 } 139 } 140 } 141 return null; 142 } 143 }