I have an NFC TAG scanner application which works fine and scans the tag and i can also read and write into tags without any issues , the only issue is that when i change the app package name and start the code , the nfc no longer works and scans tags , but when i revert to the other package name it works fine , any reason why and what could be wrong , Thank you in advance
class ActivateActivity : AppCompatActivity() {
private lateinit var binding : ActivityActivateScreenBinding
lateinit var writeTagFilters: Array<IntentFilter>
var nfcAdapter: NfcAdapter? = null
var pendingIntent: PendingIntent? = null
var writeMode = false
var myTag: Tag? = null
var actualMsg = ""
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityActivateScreenBinding.inflate(layoutInflater)
setContentView(binding.root)
binding.btnActivate.setOnClickListener {
val organizationId = binding.organizationIdEdit.text.toString()
val nfcMsg = binding.txtNFCMessage.text.toString()
actualMsg = DOMAIN + organizationId + ucync + nfcMsg
try {
if(myTag == null){
Toast.makeText(this, ERROR_DETECTED,Toast.LENGTH_LONG).show()
} else {
write(actualMsg,myTag)
Toast.makeText(this, WRITE_SUCCESS,Toast.LENGTH_LONG).show()
}
}
catch (e : IOException){
Toast.makeText(this, WRITE_ERROR, Toast.LENGTH_LONG).show()
e.printStackTrace()
}
catch (e: FormatException){
Toast.makeText(this, WRITE_ERROR, Toast.LENGTH_LONG).show()
e.printStackTrace()
}
}
nfcAdapter = NfcAdapter.getDefaultAdapter(this)
if (nfcAdapter == null) {
// Stop here, we definitely need NFC
Toast.makeText(this, "This device doesn't support NFC.", Toast.LENGTH_LONG).show()
finish()
}
//For when the activity is launched by the intent-filter for android.nfc.action.NDEF_DISCOVERE
readFromIntent(intent)
pendingIntent = PendingIntent.getActivity(this, 0, Intent(this, javaClass)
.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP),
PendingIntent.FLAG_IMMUTABLE)
val tagDetected = IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED)
tagDetected.addCategory(Intent.CATEGORY_DEFAULT)
writeTagFilters = arrayOf(tagDetected)
}
/******************************************************************************
* Read From NFC Tag
****************************************************************************/
private fun readFromIntent(intent: Intent) {
val action = intent.action
if (NfcAdapter.ACTION_TAG_DISCOVERED == action || NfcAdapter.ACTION_TECH_DISCOVERED == action || NfcAdapter.ACTION_NDEF_DISCOVERED == action) {
myTag = intent.getParcelableExtra<Parcelable>(NfcAdapter.EXTRA_TAG) as Tag?
val rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES)
val msgs = mutableListOf<NdefMessage>()
if (rawMsgs != null) {
for (i in rawMsgs.indices) {
msgs.add(i, rawMsgs[i] as NdefMessage)
}
buildTagViews(msgs.toTypedArray())
}
}
}
private fun buildTagViews(msgs: Array<NdefMessage>) {
if (msgs.isEmpty()) return
val text: String
val payload = msgs[0].records[0].payload
val textEncoding: Charset = if ((payload[0] and 128.toByte()).toInt() == 0) Charsets.UTF_8 else Charsets.UTF_16 // Get the Text Encoding
val languageCodeLength: Int = (payload[0] and 51).toInt() // Get the Language Code, e.g. "en"
try {
// Get the Text
text = String(payload, languageCodeLength + 1, payload.size - languageCodeLength - 1, textEncoding)
Log.d("VALUE","VALUE IS " + text)
} catch (e: UnsupportedEncodingException) {
Log.e("UnsupportedEncoding", e.toString())
}
}
/******************************************************************************
* Write to NFC Tag
****************************************************************************/
private fun write(msg : String , tag : Tag?){
val records = arrayOf(createRecord(msg))
val message = NdefMessage(records)
// Get an instance of Ndef for the tag.
val ndef = Ndef.get(tag)
// Enable I/O
ndef.connect()
// Write the message
ndef.writeNdefMessage(message)
// Close the connection
ndef.close()
}
@Throws(UnsupportedEncodingException::class)
private fun createRecord(text: String): NdefRecord {
val lang = "en"
val textBytes = text.toByteArray()
val langBytes = lang.toByteArray(charset("US-ASCII"))
val langLength = langBytes.size
val textLength = textBytes.size
val payload = ByteArray(1 + langLength + textLength)
// set status byte (see NDEF spec for actual bits)
payload[0] = langLength.toByte()
// copy langbytes and textbytes into payload
System.arraycopy(langBytes, 0, payload, 1, langLength)
System.arraycopy(textBytes, 0, payload, 1 + langLength, textLength)
return NdefRecord(NdefRecord.TNF_WELL_KNOWN, NdefRecord.RTD_TEXT, ByteArray(0), payload)
}
/**
* For reading the NFC when the app is already launched
*/
override fun onNewIntent(intent: Intent) {
super.onNewIntent(intent)
setIntent(intent)
readFromIntent(intent)
if (NfcAdapter.ACTION_TAG_DISCOVERED == intent.action) {
myTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG)
}
}
public override fun onPause() {
super.onPause()
writeModeOff()
}
public override fun onResume() {
super.onResume()
writeModeOn()
}
/******************************************************************************
* Enable Write and foreground dispatch to prevent intent-filter to launch the app again
****************************************************************************/
private fun writeModeOn() {
writeMode = true
nfcAdapter!!.enableForegroundDispatch(this, pendingIntent, writeTagFilters, null)
}
/******************************************************************************
* Disable Write and foreground dispatch to allow intent-filter to launch the app
****************************************************************************/
private fun writeModeOff() {
writeMode = false
nfcAdapter!!.disableForegroundDispatch(this)
}
<uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.NFC"/>
<uses-feature android:name="android.hardware.nfc"
android:required="true"/>
<application
android:name=".BaseApplication"
android:allowBackup="true"
android:dataExtractionRules="@xml/data_extraction_rules"
android:fullBackupContent="@xml/backup_rules"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.UcyncBusiness"
tools:targetApi="31">
<activity
android:name=".ui.ActivateActivity"
android:exported="false">
<meta-data
android:name="android.app.lib_name"
android:value="" />
</activity>
<activity
android:name=".ui.HomeActivity"
android:exported="false">
<intent-filter>
<action android:name="android.nfc.action.NDEF_DISCOVERED" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="text/plain" />
</intent-filter>
<meta-data
android:name="android.nfc.action.TECH_DISCOVERED"
android:resource="@xml/nfc_tech_filter" />
<meta-data
android:name="android.app.lib_name"
android:value="" />
</activity>
<activity
android:name=".ui.SplashActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<meta-data
android:name="android.app.lib_name"
android:value="" />
</activity>
<activity android:name=".MainActivity" />
</application>
