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Add option to specify EXTRA_READER_PRESENCE_CHECK_DELAY on Android #228

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Add option to specify EXTRA_READER_PRESENCE_CHECK_DELAY on Android #228

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4955d1b
fix android timeout bug
w-ensink Dec 29, 2025
bb6fb63
add extra_reader_presence_check_delay to poll function in dart
w-ensink Jan 8, 2026
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30 changes: 18 additions & 12 deletions android/src/main/kotlin/im/nfc/flutter_nfc_kit/FlutterNfcKitPlugin.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ import android.nfc.NfcAdapter
import android.nfc.NfcAdapter.*
import android.nfc.Tag
import android.nfc.tech.*
import android.os.Bundle
import android.os.Handler
import android.os.HandlerThread
import android.os.Looper
Expand Down Expand Up @@ -86,13 +87,13 @@ class FlutterNfcKitPlugin : FlutterPlugin, MethodCallHandler, ActivityAware {
Log.e(TAG, "$desc error", ex)
val excMessage = ex.localizedMessage
when (ex) {
is IOException -> result?.error("500", "Communication error", excMessage)
is SecurityException -> result?.error("503", "Tag already removed", excMessage)
is FormatException -> result?.error("400", "NDEF format error", excMessage)
is InvocationTargetException -> result?.error("500", "Communication error", excMessage)
is IllegalArgumentException -> result?.error("400", "Command format error", excMessage)
is NoSuchMethodException -> result?.error("405", "Transceive not supported for this type of card", excMessage)
else -> result?.error("500", "Unhandled error", excMessage)
is IOException -> result.error("500", "Communication error", excMessage)
is SecurityException -> result.error("503", "Tag already removed", excMessage)
is FormatException -> result.error("400", "NDEF format error", excMessage)
is InvocationTargetException -> result.error("500", "Communication error", excMessage)
is IllegalArgumentException -> result.error("400", "Command format error", excMessage)
is NoSuchMethodException -> result.error("405", "Transceive not supported for this type of card", excMessage)
else -> result.error("500", "Unhandled error", excMessage)
}
}
}
Expand Down Expand Up @@ -141,7 +142,7 @@ class FlutterNfcKitPlugin : FlutterPlugin, MethodCallHandler, ActivityAware {
tagTechnology = isoDep
// historicalBytes() may return null but is wrongly typed as ByteArray!
// https://developer.android.com/reference/kotlin/android/nfc/tech/IsoDep#gethistoricalbytes
historicalBytes = (isoDep.historicalBytes as ByteArray?)?.toHexString() ?: ""
historicalBytes = isoDep.historicalBytes?.toHexString() ?: ""
}
tag.techList.contains(MifareClassic::class.java.name) -> {
standard = "ISO 14443-3 (Type A)"
Expand Down Expand Up @@ -329,8 +330,10 @@ class FlutterNfcKitPlugin : FlutterPlugin, MethodCallHandler, ActivityAware {
val timeout = call.argument<Int>("timeout")!!
// technology and option bits are set in Dart code
val technologies = call.argument<Int>("technologies")!!
val extraPresenceDelay = call.argument<Int>("extra_reader_presence_check_delay")

runOnNfcThread(result, "Poll") {
pollTag(nfcAdapter, result, timeout, technologies)
pollTag(nfcAdapter, result, timeout, technologies, extraPresenceDelay)
}
}

Expand Down Expand Up @@ -583,8 +586,7 @@ class FlutterNfcKitPlugin : FlutterPlugin, MethodCallHandler, ActivityAware {

override fun onDetachedFromActivityForConfigChanges() {}

private fun pollTag(nfcAdapter: NfcAdapter, result: Result, timeout: Int, technologies: Int) {

private fun pollTag(nfcAdapter: NfcAdapter, result: Result, timeout: Int, technologies: Int, extraReaderPresenceCheckDelay: Int?) {
pollingTimeoutTask = Timer().schedule(timeout.toLong()) {
try {
if (activity.get() != null) {
Expand All @@ -604,7 +606,11 @@ class FlutterNfcKitPlugin : FlutterPlugin, MethodCallHandler, ActivityAware {
result.success(jsonResult)
}

nfcAdapter.enableReaderMode(activity.get(), pollHandler, technologies, null)
val options = Bundle()
if (extraReaderPresenceCheckDelay != null) {
options.putInt(EXTRA_READER_PRESENCE_CHECK_DELAY, extraReaderPresenceCheckDelay)
}
nfcAdapter.enableReaderMode(activity.get(), pollHandler, technologies, options)
}

private class MethodResultWrapper(result: Result) : Result {
Expand Down
4 changes: 4 additions & 0 deletions lib/flutter_nfc_kit.dart
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Expand Up @@ -337,6 +337,7 @@ class FlutterNfcKit {
bool readIso18092 = false,
bool readIso15693 = true,
bool probeWebUSBMagic = false,
Duration? extraReaderPresenceCheckDelay,
}) async {
// use a bitmask for compact representation
int technologies = 0x0;
Expand All @@ -354,6 +355,9 @@ class FlutterNfcKit {
'iosMultipleTagMessage': iosMultipleTagMessage,
'technologies': technologies,
'probeWebUSBMagic': probeWebUSBMagic,
if (extraReaderPresenceCheckDelay != null)
"extra_reader_presence_check_delay":
extraReaderPresenceCheckDelay.inMilliseconds,
});
return NFCTag.fromJson(jsonDecode(data));
}
Expand Down