Add camera permission granted listener (#234)

Author: Fabtron

CHANGELOG.md

@@ -3,6 +3,7 @@ All notable changes to this project will be documented in this file.
 
 ## UNRELEASED
 ### Added
+* ui: Add listener to `SelfScanningFragment` to react to camera permission changes
 ### Changed
 ### Removed
 ### Fixed

ui/src/main/java/io/snabble/sdk/ui/scanner/SelfScanningFragment.kt

@@ -58,6 +58,7 @@ open class SelfScanningFragment : BaseFragment(), MenuProvider {
                 createSelfScanningView()
                 requireView().announceForAccessibility(getString(R.string.Snabble_Scanner_Accessibility_eventBackInScanner))
                 explainScanner()
+                onCameraPermissionGrantedListener?.invoke()
             } else {
                 canAskAgain = ActivityCompat.shouldShowRequestPermissionRationale(
                     requireActivity(),
@@ -67,6 +68,11 @@ open class SelfScanningFragment : BaseFragment(), MenuProvider {
             }
         }
 
+    /**
+     * Add a listener to get notified if the camera permission has been granted
+     */
+    var onCameraPermissionGrantedListener: (() -> Unit)? = null
+
     override fun onCreateActualView(
         inflater: LayoutInflater,
         container: ViewGroup?,