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Read NFC Tag UID
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| // Needed in AndroidManifest: | |
| <!-- Permission for using NFC hardware --> | |
| <uses-permission android:name="android.permission.NFC"/> | |
| <!-- Forcing device to have NFC hardware --> | |
| <uses-feature android:name="android.hardware.nfc" android:required="true"/> | |
| <!-- Registering app for receiving NFC's TAG_DISCOVERED intent --> | |
| <intent-filter> | |
| <action android:name="android.nfc.action.TAG_DISCOVERED"/> | |
| <category android:name="android.intent.category.DEFAULT"/> | |
| </intent-filter> | |
| // handling ACTION_TAG_DISCOVERED action from intent: | |
| @Override | |
| protected void onResume() { | |
| super.onResume(); | |
| if (getIntent().getAction().equals(NfcAdapter.ACTION_TAG_DISCOVERED)) { | |
| ((TextView)findViewById(R.id.text)).setText( | |
| "NFC Tag\n" + | |
| this.ByteArrayToHexString(getIntent().getByteArrayExtra(NfcAdapter.EXTRA_ID))); | |
| } | |
| } | |
| // Converting byte[] to hex string: | |
| private String ByteArrayToHexString(byte [] inarray) { | |
| int i, j, in; | |
| String [] hex = {"0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"}; | |
| String out= ""; | |
| for(j = 0 ; j < inarray.length ; ++j) | |
| { | |
| in = (int) inarray[j] & 0xff; | |
| i = (in >> 4) & 0x0f; | |
| out += hex[i]; | |
| i = in & 0x0f; | |
| out += hex[i]; | |
| } | |
| return out; | |
| } |
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