[BUG] IncomingSmsReceiver listening even when instance is not created leading to crashing of app when a background notification recieves

[loud-at-heart]

Your Environment

• Plugin version: ^0.2.0
• Platform: Android
• OS version: 12 and higher
• Device manufacturer / model: all
• Flutter info (flutter info, flutter doctor):

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.0.5, on macOS 13.0.1 22A400 darwin-arm (Rosetta), locale en-IN)
[✓] Android toolchain - develop for Android devices (Android SDK version 32.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 14.2)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2021.3)
[✓] VS Code (version 1.74.0)
[✓] VS Code (version 1.61.1)
[✓] Connected device (3 available)
[✓] HTTP Host Availability

• Plugin config

  telephony.listenIncomingSms(
      onNewMessage: onMessage,
      onBackgroundMessage: onBackgroundMessage,
    );

To Reproduce Steps to reproduce the behavior (keep eye on Logcat):

1. Install the app with the plugin and move the app to background
2. Send a random message to your respective contact number
3. Check the console logs

Debug logs

# Crashlytics - Stack trace
# Platform: android
# Date: Tue Mar 07 2023 15:58:20 GMT+0530 (India Standard Time)

Fatal Exception: java.lang.RuntimeException: Unable to start receiver com.shounakmulay.telephony.sms.IncomingSmsReceiver: java.lang.NullPointerException: Attempt to read from field 'java.lang.String io.flutter.view.FlutterCallbackInformation.callbackLibraryPath' on a null object reference in method 'java.lang.String io.flutter.embedding.engine.dart.DartExecutor$DartCallback.toString()'
       at android.app.ActivityThread.handleReceiver(ActivityThread.java:4770)
       at android.app.ActivityThread.access$1700(ActivityThread.java:310)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2292)
       at android.os.Handler.dispatchMessage(Handler.java:106)
       at android.os.Looper.loopOnce(Looper.java:226)
       at android.os.Looper.loop(Looper.java:313)
       at android.app.ActivityThread.main(ActivityThread.java:8663)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1135)

Caused by java.lang.NullPointerException: Attempt to read from field 'java.lang.String io.flutter.view.FlutterCallbackInformation.callbackLibraryPath' on a null object reference in method 'java.lang.String io.flutter.embedding.engine.dart.DartExecutor$DartCallback.toString()'
       at io.flutter.embedding.engine.dart.DartExecutor$DartCallback.toString(DartExecutor.java:421)
       at java.lang.String.valueOf(String.java:3657)
       at java.lang.StringBuilder.append(StringBuilder.java:132)
       at io.flutter.embedding.engine.dart.DartExecutor.executeDartCallback(DartExecutor.java:175)
       at com.shounakmulay.telephony.sms.IncomingSmsHandler.startBackgroundIsolate(IncomingSmsHandler.kt:154)
       at com.shounakmulay.telephony.sms.IncomingSmsReceiver.processInBackground(IncomingSmsHandler.kt:95)
       at com.shounakmulay.telephony.sms.IncomingSmsReceiver.processIncomingSms(IncomingSmsHandler.kt:82)
       at com.shounakmulay.telephony.sms.IncomingSmsReceiver.onReceive(IncomingSmsHandler.kt:50)
       at android.app.ActivityThread.handleReceiver(ActivityThread.java:4761)
       at android.app.ActivityThread.access$1700(ActivityThread.java:310)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2292)
       at android.os.Handler.dispatchMessage(Handler.java:106)
       at android.os.Looper.loopOnce(Looper.java:226)
       at android.os.Looper.loop(Looper.java:313)
       at android.app.ActivityThread.main(ActivityThread.java:8663)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1135)

Additional context This issue is happening because we are registering the broadcast receiver in Android Manifest, so on install itself the broadcast receiver is registered and starts receiving SMS , which actually should be registered when we want to listen for any incoming message