我是 Android 编码的新手，我对 NFC 技术很感兴趣。我的第一步专注于标签读/写模式，目前我看不到有关如何使用 Vcard/Vcal MIME 类型和 NDEF 记录/消息的大量信息。
如果有人可以发布一些示例代码或者更好地指向类似教程的资源，那就太好了！
编辑：这是我一直在使用的代码，它搞砸了。通过一些修改，我已经能够编写纯文本和智能海报/urs 数据。另外要记住的是，我使用的是 Type 2 NFC 标签，由于存储容量有限，我只想将姓名和电话号码保存在 Vcard 上，或者将事件名称和日期保存在 Vcal 记录上。谢谢！
公共类 VcardActivity 扩展活动 {
NfcAdapter adapter;
PendingIntent pendingIntent;
IntentFilter writeTagFilters[];
Tag tag;
Context ctx;
boolean writeMode;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_text);
getActionBar().setDisplayHomeAsUpEnabled(true);
ctx = this;
Switch swWrite = (Switch) findViewById(R.id.switchWriteText);
//final TextView msg = (TextView) findViewById(R.id.editText1);
final String msg = "BEGIN:VCARD\n" +
"VERSION:2.1\n" +
"N:Gump;Forrest\n" +
"FN:Forrest Gump\n" +
"ORG:Bubba Gump Shrimp Co.\n" +
"TITLE:Shrimp Man\n" +
"TEL;WORK;VOICE111) 555-1212\n" +
"TEL;HOME;VOICE404) 555-1212\n" +
"ADR;WORK:;;100 Edge;Baytown;United\n" +
"EMAIL;PREF;INTERNET:forrestgump@example.com\n " +
"END:VCARD";
swWrite.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (isChecked) {
try {
if (tag == null) {
Toast.makeText(ctx,
ctx.getString(R.string.error_detected),
Toast.LENGTH_SHORT).show();
} else {
write(msg, tag);
Toast.makeText(ctx,
ctx.getString(R.string.ok_writing),
Toast.LENGTH_LONG).show();
}
} catch (IOException e) {
Toast.makeText(ctx,
ctx.getString(R.string.error_writing),
Toast.LENGTH_LONG).show();
e.printStackTrace();
} catch (FormatException e) {
Toast.makeText(ctx,
ctx.getString(R.string.error_writing),
Toast.LENGTH_LONG).show();
e.printStackTrace();
}
}
}
});
/* INTENT FILTER */
adapter = NfcAdapter.getDefaultAdapter(this);
pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this,
getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
IntentFilter tagDetected = new IntentFilter(
NfcAdapter.ACTION_TAG_DISCOVERED);
tagDetected.addCategory(Intent.CATEGORY_DEFAULT);
writeTagFilters = new IntentFilter[] { tagDetected };
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_text, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
private void write(String text, Tag tag) throws IOException,
FormatException {
NdefRecord[] records = { createRecord(text) };
NdefMessage message = new NdefMessage(records);
// Get an instance of Ndef for the tag.
Ndef ndef = Ndef.get(tag);
// Enable I/O
ndef.connect();
// Write the message
ndef.writeNdefMessage(message);
// Close the connection
ndef.close();
}
private NdefRecord createRecord(String text)
throws UnsupportedEncodingException {
String msg = "BEGIN:VCARD\n" +
"VERSION:2.1\n" +
"N:Gump;Forrest\n" +
"FN:Forrest Gump\n" +
"ORG:Bubba Gump Shrimp Co.\n" +
"TITLE:Shrimp Man\n" +
"TEL;WORK;VOICE:55-1212\n" +
"TEL;HOME;VOICE:55-1212\n" +
"ADR;WORK:;;100 Edge;Ban;United\n" +
"EMAIL;PREF;INTERNET:p@example.com\n " +
"END:VCARD";
byte[] textBytes = msg.getBytes();
NdefRecord textRecord = new NdefRecord(NdefRecord.TNF_MIME_MEDIA,
"text/x-vCard".getBytes(), new byte[] {}, textBytes);
return textRecord;
}
@Override
protected void onNewIntent(Intent intent) {
if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(intent.getAction())) {
tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
Toast.makeText(this,
this.getString(R.string.ok_detection) + tag.toString(),
Toast.LENGTH_LONG).show();
}
}
@Override
public void onPause() {
super.onPause();
WriteModeOff();
}
@Override
public void onResume() {
super.onResume();
WriteModeOn();
}
private void WriteModeOn() {
writeMode = true;
adapter.enableForegroundDispatch(this, pendingIntent, writeTagFilters,
null);
}
private void WriteModeOff() {
writeMode = false;
adapter.disableForegroundDispatch(this);
}
}