Android 使用手机NFC的读取NFC标签数据的方法

<uses-permission android:name="android.permission.NFC" / 

<uses-feature android:name="android.hardware.nfc" android:required="true" / 

<activity 
...
      <intent-filter 
        <action android:name="android.nfc.action.NDEF_DISCOVERED" / 
      </intent-filter 
...
</activity 

<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2" 
  <tech-list 
    <resources  
  <tech-list 
    <!--<tech android.nfc.tech.IsoDep</tech -- 
    <tech android.nfc.tech.NfcA</tech 
    <!--<tech android.nfc.tech.NfcB</tech -- 
    <!--<tech android.nfc.tech.NfcF</tech -- 
    <!--<tech android.nfc.tech.NfcV</tech -- 
    <tech android.nfc.tech.Ndef</tech 
    <!--<tech android.nfc.tech.NdefFormatable</tech -- 
    <!--<tech android.nfc.tech.MifareClassic</tech -- 
    <!--<tech android.nfc.tech.MifareUltralight</tech -- 
  </tech-list 
</resources 
  </tech-list 
</resources 
<activity 
...
      <intent-filter 
        <action android:name="android.nfc.action.TECH_DISCOVERED" / 
      </intent-filter 

      <meta-data
        android:name="android.nfc.action.TECH_DISCOVERED"
        android:resource="@xml/nfc_tech_filter" / 

<meta-data android:name="android.nfc.action.TECH_DISCOVERED"
  android:resource="@xml/nfc_tech_filter" / 
...
</activity 
ACTION_TAG_DISCOVERED，可以添加如下权限

<activity 
···
      <intent-filter 
        <action android:name="android.nfc.action.TAG_DISCOVERED" / 
      </intent-filter 
···
</activity 

public class NfcActivity extends Activity {
private static final String TAG = "NfcActivity";
private TextView tvNFCMessage;
private PendingIntent mPendingIntent;
private NfcAdapter mNfcAdapter;
private Button btnClean;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_nfc);
Log.i(TAG, "onCreate: ");
btnClean = findViewById(R.id.btn_clean);
tvNFCMessage = findViewById(R.id.tv_show_nfc);
resolveIntent(getIntent());
//初始化nfc
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
mPendingIntent = PendingIntent.getActivity(this, 0,
new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
if (mNfcAdapter == null) {
Toast.makeText(NfcActivity.this, "nfc is not available", Toast.LENGTH_SHORT).show();
finish();
return;
}
btnClean.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvNFCMessage.setText("");
}
});
}
@Override
protected void onResume() {
super.onResume();
Log.i(TAG, "onResume: ");
if (mNfcAdapter != null) { //有nfc功能
if (mNfcAdapter.isEnabled()) {
//nfc功能打开了
//隐式启动
mNfcAdapter.enableForegroundDispatch(this, mPendingIntent, null, null);
} else {
Toast.makeText(NfcActivity.this, "请打开nfc功能", Toast.LENGTH_SHORT).show();
}
}
}
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
Log.i(TAG, "onNewIntent: ");
setIntent(intent);
if (mNfcAdapter != null) { //有nfc功能
if (mNfcAdapter.isEnabled()) {//nfc功能打开了
resolveIntent(getIntent());
} else {
Toast.makeText(NfcActivity.this, "请打开nfc功能", Toast.LENGTH_SHORT).show();
}
}
}
@Override
protected void onPause() {
super.onPause();
if (mNfcAdapter != null) {
mNfcAdapter.disableForegroundDispatch(this);
}
}
//初次判断是什么类型的NFC卡
private void resolveIntent(Intent intent) {
NdefMessage[] msgs = NfcUtil.getNdefMsg(intent); //重点功能，解析nfc标签中的数据
if (msgs == null) {
Toast.makeText(NfcActivity.this, "非NFC启动", Toast.LENGTH_SHORT).show();
} else {
setNFCMsgView(msgs);
}
}
/**
* 显示扫描后的信息
*
* @param ndefMessages ndef数据
*/
@SuppressLint("SetTextI18n")
private void setNFCMsgView(NdefMessage[] ndefMessages) {
if (ndefMessages == null || ndefMessages.length == 0) {
return;
}
//    tvNFCMessage.setText("Payload:" + new String(ndefMessages[0].getRecords()[0].getPayload()) + "\n");
Calendar calendar = Calendar.getInstance();
int hour = calendar.get(Calendar.HOUR_OF_DAY);
int minute = calendar.get(Calendar.MINUTE);
tvNFCMessage.append(hour + ":" + minute + "\n");
List<ParsedNdefRecord  records = NdefMessageParser.parse(ndefMessages[0]);
final int size = records.size();
for (int i = 0; i < size; i++) {
ParsedNdefRecord record = records.get(i);
tvNFCMessage.append(record.getViewText() + "\n");
}
}
}

//初次判断是什么类型的NFC卡
public static NdefMessage[] getNdefMsg(Intent intent) {
if (intent == null)
return null;
//nfc卡支持的格式
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
String[] temp = tag.getTechList();
for (String s : temp) {
Log.i(TAG, "resolveIntent tag: " + s);
}
String action = intent.getAction();
if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action) ||
NfcAdapter.ACTION_TECH_DISCOVERED.equals(action) ||
NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)) {
Parcelable[] rawMessage = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
NdefMessage[] ndefMessages;
// 判断是哪种类型的数据 默认为NDEF格式
if (rawMessage != null) {
Log.i(TAG, "getNdefMsg: ndef格式 ");
ndefMessages = new NdefMessage[rawMessage.length];
for (int i = 0; i < rawMessage.length; i++) {
ndefMessages[i] = (NdefMessage) rawMessage[i];
}
} else {
//未知类型 (公交卡类型)
Log.i(TAG, "getNdefMsg: 未知类型");
//对应的解析操作，在Github上有
}
return ndefMessages;
}
return null;
}