1 //向NFC读写数据
2 public class ReadWriteTextMainActivity extends Activity {
3 private TextView mInputText;
4 private String mText;
5
6 @Override
7 protected void onCreate(Bundle savedInstanceState) {
8 // TODO Auto-generated method stub
9 super.onCreate(savedInstanceState);
10 setContentView(R.layout.fragment_main);
11
12 mInputText = (TextView) findViewById(R.id.textView_inputtext);
13
14 }
15
16 @Override
17 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
18 // TODO Auto-generated method stub
19 super.onActivityResult(requestCode, resultCode, data);
20 if (requestCode == 1 && resultCode == 1) {
21 mText = data.getStringExtra("text");
22 mInputText.setText(mText);
23 }
24
25 }
26
27 @Override
28 protected void onNewIntent(Intent intent) {
29 // TODO Auto-generated method stub
30 super.onNewIntent(intent);
31 // 读NFC文本
32 if (mText == null) {
33 Intent myIntent = new Intent(this, ShowNFCContentActivity.class);
34 myIntent.putExtras(intent);
35 myIntent.setAction(NfcAdapter.ACTION_NDEF_DISCOVERED);
36 startActivity(myIntent);
37 } else {
38 // 写入NFC标签
39 Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
40 NdefMessage ndefMessage = new NdefMessage(
41 new NdefRecord[] { creatTextRecord(mText) });
42 writeTag(ndefMessage, tag);
43
44 }
45 }
46
47 public NdefRecord creatTextRecord(String text) {
48
49 byte[] langBytes = Locale.CHINA.getLanguage().getBytes(
50 Charset.forName("US-ASCII"));
51 Charset utfEncoding = Charset.forName("UTF-8");
52 byte[] textBytes = text.getBytes(utfEncoding);
53 int utfBit = 0;
54 char status = (char) (utfBit + langBytes.length);
55 byte[] data = new byte[1 + langBytes.length + textBytes.length];
56 data[0] = (byte) status;
57 System.arraycopy(langBytes, 0, data, 1, langBytes.length);
58 System.arraycopy(textBytes, 0, data, 1 + langBytes.length,
59 textBytes.length);
60
61 NdefRecord ndefRecord = new NdefRecord(NdefRecord.TNF_WELL_KNOWN,
62 NdefRecord.RTD_TEXT, new byte[0], data);
63 return ndefRecord;
64
65 }
66
67 boolean writeTag(NdefMessage ndefMessage, Tag tag) {
68 try {
69 Ndef ndef = Ndef.get(tag);
70 ndef.connect();
71 ndef.writeNdefMessage(ndefMessage);
72 return true;
73
74 } catch (Exception e) {
75 // TODO: handle exception
76 }
77
78 return false;
79
80 }
81 }
1 //读取nfc标签
2 public class ShowNFCContentActivity extends Activity {
3 private TextView mTagContent;
4 private Tag mDetecTag;
5 private String mTagText;
6
7 @Override
8 protected void onCreate(Bundle savedInstanceState) {
9 // TODO Auto-generated method stub
10 super.onCreate(savedInstanceState);
11 setContentView(R.layout.show_nfc_tagcontent);
12 mTagContent = (TextView) findViewById(R.id.textView_tag_content);
13 mDetecTag = getIntent().getParcelableExtra(NfcAdapter.EXTRA_TAG);
14 Ndef ndef = Ndef.get(mDetecTag);
15
16 mTagText = ndef.getType() + "\n maxsize:" + ndef.getMaxSize()
17 + "bytes \n";
18
19 readNFCtag();
20
21 mTagContent.setText(mTagText);
22
23 }
24
25 private void readNFCtag() {
26 // TODO Auto-generated method stub
27 if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())) {
28
29 Parcelable[] rawMsg = getIntent().getParcelableArrayExtra(
30 NfcAdapter.EXTRA_NDEF_MESSAGES);
31 NdefMessage message[] = null;
32 int contenSize = 0;
33 if (rawMsg != null) {
34 message = new NdefMessage[rawMsg.length];
35 for (int i = 0; i < rawMsg.length; i++) {
36 message[i] = (NdefMessage) rawMsg[i];
37 contenSize += message[i].toByteArray().length;
38
39 }
40 }
41 try {
42 if (message != null) {
43 NdefRecord record = message[0].getRecords()[0];
44 TextRecord textRecord = TextRecord.parse(record);
45 mTagText += textRecord.getText() + "\n\ntext\n"
46 + contenSize + "bytes";
47
48 }
49 } catch (Exception e) {
50 // TODO: handle exception
51 }
52 }
53 }
54
55 }
1 public class InputTextActivity extends Activity {
2 private EditText mTextTag;
3
4 @Override
5 protected void onCreate(Bundle savedInstanceState) {
6 // TODO Auto-generated method stub
7 super.onCreate(savedInstanceState);
8 setContentView(R.layout.input);
9 mTextTag = (EditText) findViewById(R.id.editText1);
10
11 }
12
13 public void click(View view) {
14 Intent intent = new Intent();
15 intent.putExtra("text", mTextTag.getText().toString());
16 setResult(1, intent);
17 finish();
18 }
19 }
1 public class TextRecord {
2 private final String mText;
3
4 private TextRecord(String text) {
5 // TODO Auto-generated constructor stub
6
7 mText = text;
8 }
9
10 public String getText() {
11 return mText;
12 }
13
14 public static TextRecord parse(NdefRecord ndefRecord) {
15 //
16 if (ndefRecord.getTnf() != NdefRecord.TNF_WELL_KNOWN) {
17 return null;
18 }
19
20 if (!Arrays.equals(ndefRecord.getType(), NdefRecord.RTD_TEXT)) {
21 return null;
22 }
23
24 try {
25
26 byte[] palyload = ndefRecord.getPayload();
27 // 根据最高位判断字符编码
28 String textEncoding = ((palyload[0] & 0x80) == 0) ? "UTF-8"
29 : "UTF-16";
30 // 根据第六位获得语言编码长度
31 int languageCodeLength = palyload[0] & 0x3f;
32 // 获得语言编码
33 String languageCod = new String(palyload, 1, languageCodeLength,
34 "US-ASCII");
35
36 String text = new String(palyload, languageCodeLength + 1,
37 palyload.length - languageCodeLength - 1, textEncoding);
38
39 return new TextRecord(text);
40
41 } catch (Exception e) {
42 // TODO: handle exception
43 throw new IllegalArgumentException();
44 }
45
46 }
47 }
