优化

app/src/main/java/io/legado/app/ui/main/bookshelf/books/BooksDiffCallBack.kt

@@ -7,11 +7,6 @@ import io.legado.app.data.entities.Book
 class BooksDiffCallBack(private val oldItems: List<Book>, private val newItems: List<Book>) :
     DiffUtil.Callback() {
 
-
-    override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
-        return oldItems[oldItemPosition].bookUrl == newItems[newItemPosition].bookUrl
-    }
-
     override fun getOldListSize(): Int {
         return oldItems.size
     }
@@ -20,6 +15,10 @@ class BooksDiffCallBack(private val oldItems: List<Book>, private val newItems:
         return newItems.size
     }
 
+    override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
+        return oldItems[oldItemPosition].bookUrl == newItems[newItemPosition].bookUrl
+    }
+
     override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
         val oldItem = oldItems[oldItemPosition]
         val newItem = newItems[newItemPosition]

app/src/main/java/io/legado/app/ui/main/bookshelf/books/BooksFragment.kt

@@ -104,13 +104,8 @@ class BooksFragment : BaseFragment(R.layout.fragment_books),
             else -> App.db.bookDao().observeByGroup(groupId)
         }
         bookshelfLiveData?.observe(this, Observer {
-            val diffResult =
-                DiffUtil.calculateDiff(
-                    BooksDiffCallBack(
-                        booksAdapter.getItems(),
-                        it
-                    )
-                )
+            val diffResult = DiffUtil
+                .calculateDiff(BooksDiffCallBack(ArrayList(booksAdapter.getItems()), it))
             booksAdapter.setItems(it, false)
             diffResult.dispatchUpdatesTo(booksAdapter)
         })

app/src/main/java/io/legado/app/ui/main/explore/ExploreDiffCallBack.kt

@@ -0,0 +1,34 @@
+package io.legado.app.ui.main.explore
+
+import androidx.recyclerview.widget.DiffUtil
+import io.legado.app.data.entities.BookSource
+
+
+class ExploreDiffCallBack(
+    private val oldItems: List<BookSource>,
+    private val newItems: List<BookSource>
+) :
+    DiffUtil.Callback() {
+
+    override fun getOldListSize(): Int {
+        return oldItems.size
+    }
+
+    override fun getNewListSize(): Int {
+        return newItems.size
+    }
+
+    override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
+        return true
+    }
+
+    override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
+        val oldItem = oldItems[oldItemPosition]
+        val newItem = newItems[newItemPosition]
+        if (oldItem.bookSourceName != newItem.bookSourceName) {
+            return false
+        }
+        return true
+    }
+
+}

app/src/main/java/io/legado/app/ui/main/explore/ExploreFragment.kt

@@ -5,7 +5,9 @@ import android.view.View
 import androidx.appcompat.widget.SearchView
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.Observer
+import androidx.recyclerview.widget.DiffUtil
 import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
 import io.legado.app.App
 import io.legado.app.R
 import io.legado.app.base.VMBaseFragment
@@ -61,6 +63,15 @@ class ExploreFragment : VMBaseFragment<ExploreViewModel>(R.layout.fragment_find_
         rv_find.layoutManager = linearLayoutManager
         adapter = ExploreAdapter(requireContext(), this, this)
         rv_find.adapter = adapter
+        adapter.registerAdapterDataObserver(object : RecyclerView.AdapterDataObserver() {
+
+            override fun onItemRangeInserted(positionStart: Int, itemCount: Int) {
+                super.onItemRangeInserted(positionStart, itemCount)
+                if (positionStart == 0) {
+                    rv_find.scrollToPosition(0)
+                }
+            }
+        })
     }
 
     private fun initData(key: String? = null) {
@@ -71,7 +82,10 @@ class ExploreFragment : VMBaseFragment<ExploreViewModel>(R.layout.fragment_find_
             App.db.bookSourceDao().liveExplore("%$key%")
         }
         liveExplore?.observe(viewLifecycleOwner, Observer {
+            val diffResult = DiffUtil
+                .calculateDiff(ExploreDiffCallBack(ArrayList(adapter.getItems()), it))
             adapter.setItems(it)
+            diffResult.dispatchUpdatesTo(adapter)
         })
     }