修复bug

app/src/main/java/io/legado/app/base/adapter/DiffRecyclerAdapter.kt

@@ -16,12 +16,14 @@ import kotlin.collections.ArrayList
  */
 @Suppress("unused")
 abstract class DiffRecyclerAdapter<ITEM, VB : ViewBinding>(protected val context: Context) :
-    RecyclerView.Adapter<ItemViewHolder>() {
+    RecyclerView.Adapter<ItemViewHolder>(), AsyncListDiffer.ListListener<ITEM> {
 
     val inflater: LayoutInflater = LayoutInflater.from(context)
 
     private val asyncListDiffer: AsyncListDiffer<ITEM> by lazy {
-        AsyncListDiffer(this, diffItemCallback)
+        AsyncListDiffer(this, diffItemCallback).apply {
+            addListListener(this@DiffRecyclerAdapter)
+        }
     }
 
     private val lock = Object()
@@ -144,6 +146,13 @@ abstract class DiffRecyclerAdapter<ITEM, VB : ViewBinding>(protected val context
 
     final override fun onBindViewHolder(holder: ItemViewHolder, position: Int) {}
 
+    override fun onCurrentListChanged(
+        previousList: MutableList<ITEM>,
+        currentList: MutableList<ITEM>
+    ) {
+
+    }
+
     @Suppress("UNCHECKED_CAST")
     final override fun onBindViewHolder(
         holder: ItemViewHolder,

app/src/main/java/io/legado/app/ui/book/source/manage/BookSourceActivity.kt

@@ -152,7 +152,7 @@ class BookSourceActivity : VMBaseActivity<ActivityBookSourceBinding, BookSourceV
         adapter = BookSourceAdapter(this, this)
         binding.recyclerView.adapter = adapter
         // When this page is opened, it is in selection mode
-        val dragSelectTouchHelper: DragSelectTouchHelper =
+        val dragSelectTouchHelper =
             DragSelectTouchHelper(adapter.dragSelectCallback).setSlideArea(16, 50)
         dragSelectTouchHelper.attachToRecyclerView(binding.recyclerView)
         dragSelectTouchHelper.activeSlideSelect()
@@ -207,7 +207,6 @@ class BookSourceActivity : VMBaseActivity<ActivityBookSourceBinding, BookSourceV
                     else -> data.reversed()
                 }
             adapter.setItems(sourceList)
-            upCountView()
         })
     }
 

app/src/main/java/io/legado/app/ui/book/source/manage/BookSourceAdapter.kt

@@ -147,6 +147,13 @@ class BookSourceAdapter(context: Context, val callBack: CallBack) :
         }
     }
 
+    override fun onCurrentListChanged(
+        previousList: MutableList<BookSource>,
+        currentList: MutableList<BookSource>
+    ) {
+        callBack.upCountView()
+    }
+
     private fun showMenu(view: View, position: Int) {
         val source = getItem(position) ?: return
         val popupMenu = PopupMenu(context, view)

app/src/main/java/io/legado/app/ui/rss/source/manage/RssSourceActivity.kt

@@ -209,7 +209,6 @@ class RssSourceActivity : VMBaseActivity<ActivityRssSourceBinding, RssSourceView
             }
         sourceLiveData?.observe(this, {
             adapter.setItems(it)
-            upCountView()
         })
     }
 

app/src/main/java/io/legado/app/ui/rss/source/manage/RssSourceAdapter.kt

@@ -128,6 +128,13 @@ class RssSourceAdapter(context: Context, val callBack: CallBack) :
         }
     }
 
+    override fun onCurrentListChanged(
+        previousList: MutableList<RssSource>,
+        currentList: MutableList<RssSource>
+    ) {
+        callBack.upCountView()
+    }
+
     fun selectAll() {
         getItems().forEach {
             selected.add(it)