Merge pull request #756 from SomberNight/202304_fix_android_notificat…

…ion_sdk31

android: fix notification.notify() for sdk>=31, by setting new req flag

plyer/platforms/android/notification.py

@@ -148,10 +148,15 @@ def _set_open_behavior(notification):
         notification_intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP)
         notification_intent.setAction(Intent.ACTION_MAIN)
         notification_intent.addCategory(Intent.CATEGORY_LAUNCHER)
+        if SDK_INT >= 23:
+            # FLAG_IMMUTABLE added in SDK 23, required since SDK 31:
+            pending_flags = PendingIntent.FLAG_IMMUTABLE
+        else:
+            pending_flags = 0
 
         # get our application Activity
         pending_intent = PendingIntent.getActivity(
-            app_context, 0, notification_intent, 0
+            app_context, 0, notification_intent, pending_flags
         )
 
         notification.setContentIntent(pending_intent)