优化

app/src/main/java/io/legado/app/ui/changecover/ChangeCoverDialog.kt

@@ -47,6 +47,7 @@ class ChangeCoverDialog : DialogFragment(), ChangeCoverViewModel.CallBack {
         savedInstanceState: Bundle?
     ): View? {
         viewModel = getViewModel(ChangeCoverViewModel::class.java)
+        viewModel.callBack = this
         return inflater.inflate(R.layout.dialog_change_source, container)
     }
 

app/src/main/java/io/legado/app/ui/changecover/ChangeCoverViewModel.kt

@@ -5,7 +5,7 @@ import io.legado.app.App
 import io.legado.app.base.BaseViewModel
 
 class ChangeCoverViewModel(application: Application) : BaseViewModel(application) {
-
+    var callBack: CallBack? = null
     var name: String = ""
     var author: String = ""
 

app/src/main/java/io/legado/app/ui/changesource/ChangeSourceDialog.kt

@@ -55,6 +55,7 @@ class ChangeSourceDialog : DialogFragment(),
         savedInstanceState: Bundle?
     ): View? {
         viewModel = getViewModel(ChangeSourceViewModel::class.java)
+        viewModel.callBack = this
         return inflater.inflate(R.layout.dialog_change_source, container)
     }
 
@@ -92,7 +93,6 @@ class ChangeSourceDialog : DialogFragment(),
             DividerItemDecoration(requireContext(), LinearLayout.VERTICAL)
         )
         recycler_view.adapter = changeSourceAdapter
-        viewModel.callBack = this
     }
 
     private fun initSearchView() {