Error When App Starts from NFC Tag Scan Event

When the app starts from an NFC tag scan event, the channelCallback is null, causing an NPE.

E/AndroidRuntime: FATAL EXCEPTION: pool-3-thread-1
    java.lang.NullPointerException: Attempt to invoke virtual method 'void org.apache.cordova.CallbackContext.sendPluginResult(org.apache.cordova.PluginResult)' on a null object reference
        at com.chariotsolutions.nfc.plugin.NfcPlugin.sendEvent(NfcPlugin.java:740)
        at com.chariotsolutions.nfc.plugin.NfcPlugin.fireNdefEvent(NfcPlugin.java:749)
        at com.chariotsolutions.nfc.plugin.NfcPlugin.lambda$parseMessage$10$NfcPlugin(NfcPlugin.java:708)
        at com.chariotsolutions.nfc.plugin.-$$Lambda$NfcPlugin$8qvszOgjpGqW46Vg-QVXuocmsg8.run(Unknown Source:2)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:919)

[paulq1984]

Watching this as I’m having similar issues when using PhoneGap/Cordova plugin in Capacitor 3 and Ionic 5.

[somq]

For anyone that looks for a bundled solution with Android 12 compat. This fork groups both fixes:

• @gercobrandwijk fix for intennt filter and tag dispatch at app launch
• Android 12 compat (FLAG_IMMUTABLE)

You can directly reference the branch in package.json

[...]
  "dependencies": {
    "phonegap-nfc": "somq/phonegap-nfc#fix/nfc-launch",
    [...]
  }

Edit: proposed the PR as !470 as a reference even though commits are not really clean…