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NFC技术：读写NFC标签中的Uri数据
1 public class UriRecord { 2 public static final Map<Byte, String> URI_PREFIX_MAP = new HashMap<Byte, String>(); 3 static { 4 URI_PREFIX_MAP.put((byte) 0x00, ""); 5 URI_PREFIX_MAP.put((byte) 0x01, "http://www."); 6 URI_PREFIX_MAP.put((byte) 0x02, "https://www."); 7 URI_PREFIX_MAP.put((byte) 0x03, "http://"); 8 URI_PREFIX_MAP.put((byte) 0x04, "https://"); 9 URI_PREFIX_MAP.put((byte) 0x05, "tel:"); 10 URI_PREFIX_MAP.put((byte) 0x06, "mailto:"); 11 URI_PREFIX_MAP.put((byte) 0x07, "ftp://anonymous:anonymous@"); 12 URI_PREFIX_MAP.put((byte) 0x08, "ftp://ftp."); 13 URI_PREFIX_MAP.put((byte) 0x09, "ftps://"); 14 URI_PREFIX_MAP.put((byte) 0x0A, "sftp://"); 15 URI_PREFIX_MAP.put((byte) 0x0B, "smb://"); 16 URI_PREFIX_MAP.put((byte) 0x0C, "nfs://"); 17 URI_PREFIX_MAP.put((byte) 0x0D, "ftp://"); 18 URI_PREFIX_MAP.put((byte) 0x0E, "dav://"); 19 URI_PREFIX_MAP.put((byte) 0x0F, "news:"); 20 URI_PREFIX_MAP.put((byte) 0x10, "telnet://"); 21 URI_PREFIX_MAP.put((byte) 0x11, "imap:"); 22 URI_PREFIX_MAP.put((byte) 0x12, "rtsp://"); 23 URI_PREFIX_MAP.put((byte) 0x13, "urn:"); 24 URI_PREFIX_MAP.put((byte) 0x14, "pop:"); 25 URI_PREFIX_MAP.put((byte) 0x15, "sip:"); 26 URI_PREFIX_MAP.put((byte) 0x16, "sips:"); 27 URI_PREFIX_MAP.put((byte) 0x17, "tftp:"); 28 URI_PREFIX_MAP.put((byte) 0x18, "btspp://"); 29 URI_PREFIX_MAP.put((byte) 0x19, "btl2cap://"); 30 URI_PREFIX_MAP.put((byte) 0x1A, "btgoep://"); 31 URI_PREFIX_MAP.put((byte) 0x1B, "tcpobex://"); 32 URI_PREFIX_MAP.put((byte) 0x1C, "irdaobex://"); 33 URI_PREFIX_MAP.put((byte) 0x1D, "file://"); 34 URI_PREFIX_MAP.put((byte) 0x1E, "urn:epc:id:"); 35 URI_PREFIX_MAP.put((byte) 0x1F, "urn:epc:tag:"); 36 URI_PREFIX_MAP.put((byte) 0x20, "urn:epc:pat:"); 37 URI_PREFIX_MAP.put((byte) 0x21, "urn:epc:raw:"); 38 URI_PREFIX_MAP.put((byte) 0x22, "urn:epc:"); 39 URI_PREFIX_MAP.put((byte) 0x23, "urn:nfc:"); 40 } 41 private final Uri mUri; 42 43 private UriRecord(Uri uri) { 44 this.mUri = uri; 45 } 46 47 public Uri getUri() { 48 return mUri; 49 } 50 51 // 处理绝对URl(在上面没有定义的头) 52 private static UriRecord parseAbsolute(NdefRecord ndefRecord) { 53 byte[] payload = ndefRecord.getPayload(); 54 Uri uri = Uri.parse(new String(payload, Charset.forName("UTF-8"))); 55 return new UriRecord(uri); 56 57 } 58 59 // 处理已知类型的URI 60 private static UriRecord parseWellKnown(NdefRecord ndefRecord) { 61 if (!Arrays.equals(ndefRecord.getType(), NdefRecord.RTD_URI)) 62 return null; 63 // 获得所有字节数据 64 byte[] payload = ndefRecord.getPayload(); 65 // 获得前缀 66 String prefix = URI_PREFIX_MAP.get(payload[0]); 67 // 获得前缀所占字节数 68 byte[] prefixBytes = prefix.getBytes(Charset.forName("UTF-8")); 69 // 容纳整个URI的字节数组 70 byte[] fullUri = new byte[prefixBytes.length + payload.length - 1]; 71 // copy前缀 72 System.arraycopy(prefixBytes, 0, fullUri, 0, prefixBytes.length); 73 // copy除前缀，后面部分 74 System.arraycopy(payload, 1, fullUri, prefixBytes.length, 75 payload.length - 1); 76 // 生成uri 77 Uri uri = Uri.parse(new String(fullUri, Charset.forName("UTF-8"))); 78 return new UriRecord(uri); 79 80 } 81 82 public static UriRecord parse(NdefRecord record) { 83 short tnf = record.getTnf(); 84 if (tnf == NdefRecord.TNF_WELL_KNOWN) { 85 return parseWellKnown(record); 86 } else if (tnf == NdefRecord.TNF_ABSOLUTE_URI) { 87 return parseAbsolute(record); 88 } 89 throw new IllegalArgumentException("Unknown TNF " + tnf); 90 } 91 }
1 //选择一个URI，当nfc靠近手机写入NFC，，再靠近手机时读取标签信息并显示 2 public class ReadWriteUriMainActivity extends Activity { 3 private TextView mSelectUri; 4 private String mUri; 5 6 @Override 7 public void onCreate(Bundle savedInstanceState) { 8 super.onCreate(savedInstanceState); 9 setContentView(R.layout.activity_read_write_uri_main); 10 mSelectUri = (TextView) findViewById(R.id.textview_uri); 11 12 } 13 14 public void onClick_SelectUri(View view) { 15 Intent intent = new Intent(this, UriListActivity.class); 16 startActivityForResult(intent, 1); 17 18 } 19 20 @Override 21 protected void onActivityResult(int requestCode, int resultCode, Intent data) { 22 if (requestCode == 1 && resultCode == 1) { 23 mUri = data.getStringExtra("uri"); 24 mSelectUri.setText(mUri); 25 } 26 } 27 28 public void onNewIntent(Intent intent) { 29 if (mUri == null) { 30 // 读 31 Intent myIntent = new Intent(this, ShowNFCTagContentActivity.class); 32 myIntent.putExtras(intent); 33 myIntent.setAction(NfcAdapter.ACTION_NDEF_DISCOVERED); 34 startActivity(myIntent); 35 } else // 写：URI写入nfc 36 { 37 Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG); 38 NdefMessage ndefMessage = new NdefMessage( 39 new NdefRecord[] { createUriRecord(mUri) }); 40 if (writeTag(ndefMessage, tag)) { 41 mUri = null; 42 mSelectUri.setText(""); 43 } 44 } 45 } 46 47 // 转化为NdefRecord格式 48 public NdefRecord createUriRecord(String uriStr) { 49 byte prefix = 0; 50 for (Byte b : UriRecord.URI_PREFIX_MAP.keySet()) { 51 String prefixStr = UriRecord.URI_PREFIX_MAP.get(b).toLowerCase(); 52 if ("".equals(prefixStr)) 53 continue; 54 if (uriStr.toLowerCase().startsWith(prefixStr)) { 55 prefix = b; 56 uriStr = uriStr.substring(prefixStr.length()); 57 break; 58 } 59 60 } 61 // 整个uri； 62 byte[] data = http://www.mamicode.com/new byte[1 + uriStr.length()]; 63 data[0] = prefix; 64 System.arraycopy(uriStr.getBytes(), 0, data, 1, uriStr.length()); 65 66 NdefRecord record = new NdefRecord(NdefRecord.TNF_WELL_KNOWN, 67 NdefRecord.RTD_URI, new byte[0], data); 68 return record; 69 } 70 71 // 写入NFC标签 72 boolean writeTag(NdefMessage message, Tag tag) { 73 int size = message.toByteArray().length; 74 try { 75 Ndef ndef = Ndef.get(tag); 76 if (ndef != null) { 77 ndef.connect(); 78 if (!ndef.isWritable()) { 79 return false; 80 } 81 if (ndef.getMaxSize() < size) { 82 return false; 83 } 84 ndef.writeNdefMessage(message); 85 Toast.makeText(this, "ok", Toast.LENGTH_LONG).show(); 86 return true; 87 } 88 } catch (Exception e) { 89 // TODO: handle exception 90 } 91 return false; 92 } 93 }
1 //显示从NFC标签读取的数据 2 public class ShowNFCTagContentActivity extends Activity 3 { 4 private TextView mTagContent; 5 private Tag mDetectedTag; 6 private String mTagText; 7 8 @Override 9 public void onCreate(Bundle savedInstanceState) 10 { 11 super.onCreate(savedInstanceState); 12 setContentView(R.layout.activity_show_nfctag_content); 13 mTagContent = (TextView) findViewById(R.id.textview_tag_content); 14 //接收传过来的数据 15 mDetectedTag = getIntent().getParcelableExtra(NfcAdapter.EXTRA_TAG); 16 Ndef ndef = Ndef.get(mDetectedTag); 17 mTagText = ndef.getType() + "\n max size:" + ndef.getMaxSize() + " bytes\n\n"; 18 19 readNFCTag(); 20 21 mTagContent.setText(mTagText); 22 } 23 //读取nfc标签 24 private void readNFCTag() 25 { 26 if(NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())) 27 { 28 Parcelable[] rawMsgs = getIntent().getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES); 29 30 NdefMessage ndefMessage = null; 31 32 int contentSize = 0; 33 if(rawMsgs != null) 34 { 35 if(rawMsgs.length > 0) 36 { 37 ndefMessage = (NdefMessage)rawMsgs[0]; 38 contentSize = ndefMessage.toByteArray().length; 39 } 40 else 41 { 42 return; 43 } 44 } 45 try 46 { 47 NdefRecord ndefRecord = ndefMessage.getRecords()[0]; 48 UriRecord uriRecord = UriRecord.parse(ndefRecord); 49 mTagText += uriRecord.getUri().toString() + "\n\nUri\n" + contentSize + " bytes"; 50 } 51 catch (Exception e) { 52 // TODO: handle exception 53 } 54 } 55 } 56 57 }
1 //显示URI列表 2 public class UriListActivity extends ListActivity implements 3 OnItemClickListener 4 { 5 private String uris[] = new String[] 6 { "http://www.google.com", "http://www.apple.com", 7 "http://developer.apple.com", "http://www.126.com", 8 "ftp://192.168.17.160", "https://192.168.17.120", 9 "smb://192.168.17.100" }; 10 11 @Override 12 public void onCreate(Bundle savedInstanceState) 13 { 14 super.onCreate(savedInstanceState); 15 ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, 16 android.R.layout.simple_list_item_1, android.R.id.text1, uris); 17 setListAdapter(arrayAdapter); 18 getListView().setOnItemClickListener(this); 19 } 20 21 @Override 22 public void onItemClick(AdapterView<?> parent, View view, int position, 23 long id) 24 { 25 Intent intent = new Intent(); 26 intent.putExtra("uri", uris[position]); 27 setResult(1, intent); 28 finish(); 29 30 31 } 32 33 }
NFC技术：读写NFC标签中的Uri数据
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