From fb64d9afc9955aa6dab82d7eb954bcf9ad169cfd Mon Sep 17 00:00:00 2001
From: Bang-ukpc <bang.nguyen@ukparkingcontrol.com>
Date: Mon, 12 Jan 2026 03:48:15 +0000
Subject: [PATCH] Fix: Add initialization checks for bluetoothService and
 adapter in cleanup methods

- Fix crash when BackgroundService stops before onAttachedToActivity is called
- Add check in onDetachedFromEngine() for bluetoothService and adapter
- Add check in onDetachedFromActivityForConfigChanges() for bluetoothService
- Add check in onReattachedToActivityForConfigChanges() for bluetoothService
- Add check in onDetachedFromActivity() for bluetoothService

This prevents UninitializedPropertyAccessException when plugin cleanup
happens before lateinit properties are initialized.

Fixes issue: kotlin.UninitializedPropertyAccessException: lateinit property bluetoothService has not been initialized
---
 .../FlutterPosPrinterPlatformPlugin.kt        | 27 +++++++++++++++----
 1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/android/src/main/kotlin/com/sersoluciones/flutter_pos_printer_platform/FlutterPosPrinterPlatformPlugin.kt b/android/src/main/kotlin/com/sersoluciones/flutter_pos_printer_platform/FlutterPosPrinterPlatformPlugin.kt
index 53340209..7bfb2d76 100644
--- a/android/src/main/kotlin/com/sersoluciones/flutter_pos_printer_platform/FlutterPosPrinterPlatformPlugin.kt
+++ b/android/src/main/kotlin/com/sersoluciones/flutter_pos_printer_platform/FlutterPosPrinterPlatformPlugin.kt
@@ -177,8 +177,16 @@ class FlutterPosPrinterPlatformPlugin : FlutterPlugin, MethodCallHandler, Plugin
         messageChannel = null
         messageUSBChannel = null
 
-        bluetoothService.setHandler(null)
-        adapter.setHandler(null)
+        // Check if bluetoothService is initialized before cleanup
+        // This prevents crash when BackgroundService stops before onAttachedToActivity is called
+        if (::bluetoothService.isInitialized) {
+            bluetoothService.setHandler(null)
+        }
+        
+        // Check if adapter is initialized before cleanup
+        if (::adapter.isInitialized) {
+            adapter.setHandler(null)
+        }
     }
 
     override fun onAttachedToActivity(binding: ActivityPluginBinding) {
@@ -227,7 +235,10 @@ class FlutterPosPrinterPlatformPlugin : FlutterPlugin, MethodCallHandler, Plugin
     override fun onDetachedFromActivityForConfigChanges() {
         Log.d(TAG, "onDetachedFromActivityForConfigChanges")
         currentActivity = null
-        bluetoothService.setActivity(null)
+        // Check if bluetoothService is initialized before cleanup
+        if (::bluetoothService.isInitialized) {
+            bluetoothService.setActivity(null)
+        }
     }
 
     override fun onReattachedToActivityForConfigChanges(binding: ActivityPluginBinding) {
@@ -235,13 +246,19 @@ class FlutterPosPrinterPlatformPlugin : FlutterPlugin, MethodCallHandler, Plugin
         currentActivity = binding.activity
         binding.addRequestPermissionsResultListener(this)
         binding.addActivityResultListener(this)
-        bluetoothService.setActivity(currentActivity)
+        // Check if bluetoothService is initialized before setting activity
+        if (::bluetoothService.isInitialized) {
+            bluetoothService.setActivity(currentActivity)
+        }
     }
 
     override fun onDetachedFromActivity() {
         Log.d(TAG, "onDetachedFromActivity")
         currentActivity = null
-        bluetoothService.setActivity(null)
+        // Check if bluetoothService is initialized before cleanup
+        if (::bluetoothService.isInitialized) {
+            bluetoothService.setActivity(null)
+        }
     }
 
     override fun onMethodCall(@NonNull call: MethodCall, @NonNull result: Result) {