inline function type; fix unsafe access of listener

@@ -20,7 +20,7 @@ class MethodCallHandlerImpl(
     private val barcodeHandler: BarcodeHandler,
     private val barcodeHandler: BarcodeHandler,
     binaryMessenger: BinaryMessenger,
     binaryMessenger: BinaryMessenger,
     private val permissions: MobileScannerPermissions,
     private val permissions: MobileScannerPermissions,
-    private val permissionsRegistry: MobileScannerPermissions.PermissionsRegistry,
+    private val addPermissionListener: (RequestPermissionsResultListener) -> Unit,
     textureRegistry: TextureRegistry): MethodChannel.MethodCallHandler {
     textureRegistry: TextureRegistry): MethodChannel.MethodCallHandler {
 
 
     private val analyzerCallback: AnalyzerCallback = { barcodes: List<Map<String, Any?>>?->
     private val analyzerCallback: AnalyzerCallback = { barcodes: List<Map<String, Any?>>?->
@@ -98,7 +98,7 @@ class MethodCallHandlerImpl(
             "state" -> result.success(permissions.hasCameraPermission(activity))
             "state" -> result.success(permissions.hasCameraPermission(activity))
             "request" -> permissions.requestPermission(
             "request" -> permissions.requestPermission(
                 activity,
                 activity,
-                permissionsRegistry,
+                addPermissionListener,
                 object: MobileScannerPermissions.ResultCallback {
                 object: MobileScannerPermissions.ResultCallback {
                     override fun onResult(errorCode: String?, errorDescription: String?) {
                     override fun onResult(errorCode: String?, errorDescription: String?) {
                         if(errorCode == null) {
                         if(errorCode == null) {

@@ -24,11 +24,6 @@ class MobileScannerPermissions {
         const val REQUEST_CODE = 0x0786
         const val REQUEST_CODE = 0x0786
     }
     }
 
 
-    interface PermissionsRegistry {
-        @SuppressWarnings("deprecation")
-        fun addListener(handler: RequestPermissionsResultListener)
-    }
-
     interface ResultCallback {
     interface ResultCallback {
         fun onResult(errorCode: String?, errorDescription: String?)
         fun onResult(errorCode: String?, errorDescription: String?)
     }
     }
@@ -55,7 +50,7 @@ class MobileScannerPermissions {
     }
     }
 
 
     fun requestPermission(activity: Activity,
     fun requestPermission(activity: Activity,
-                          permissionsRegistry: PermissionsRegistry,
+                          addPermissionListener: (RequestPermissionsResultListener) -> Unit,
                           callback: ResultCallback) {
                           callback: ResultCallback) {
         if (ongoing) {
         if (ongoing) {
             callback.onResult(
             callback.onResult(
@@ -79,7 +74,7 @@ class MobileScannerPermissions {
                     }
                     }
                 }
                 }
             )
             )
-            permissionsRegistry.addListener(listener)
+            listener?.let { listener -> addPermissionListener(listener) }
         }
         }
 
 
         ongoing = true
         ongoing = true