add extra_reader_presence_check_delay to poll function in dart

Author: w-ensink

android/src/main/kotlin/im/nfc/flutter_nfc_kit/FlutterNfcKitPlugin.kt

@@ -330,8 +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)
                 }
             }
 
@@ -584,8 +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) {
@@ -605,11 +606,10 @@ class FlutterNfcKitPlugin : FlutterPlugin, MethodCallHandler, ActivityAware {
             result.success(jsonResult)
         }
 
-        // The EXTRA_READER_PRESENCE_CHECK_DELAY is for fixing an obscure bug with
-        // some Android versions like LineageOS 17.1 that caused the PACE authentication to fail.
-        // See https://github.com/privacybydesign/vcmrtd/issues/91 for more info.
         val options = Bundle()
-        options.putInt(EXTRA_READER_PRESENCE_CHECK_DELAY, 2000)
+        if (extraReaderPresenceCheckDelay != null) {
+            options.putInt(EXTRA_READER_PRESENCE_CHECK_DELAY, extraReaderPresenceCheckDelay)
+        }
         nfcAdapter.enableReaderMode(activity.get(), pollHandler, technologies, options)
     }
 

lib/flutter_nfc_kit.dart

@@ -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;
@@ -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));
   }