up

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

@@ -0,0 +1,33 @@
+package io.legado.app.ui.main.bookshelf
+
+import androidx.recyclerview.widget.DiffUtil
+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
+    }
+
+    override fun getNewListSize(): Int {
+        return newItems.size
+    }
+
+    override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
+        val oldItem = oldItems[oldItemPosition]
+        val newItem = newItems[newItemPosition]
+        return oldItem.name == newItem.name
+                && oldItem.durChapterTitle == newItem.durChapterTitle
+                && oldItem.latestChapterTitle == newItem.latestChapterTitle
+                && oldItem.getDisplayCover() == newItem.getDisplayCover()
+                && oldItem.getUnreadChapterNum() == newItem.getUnreadChapterNum()
+                && oldItem.lastCheckCount == newItem.lastCheckCount
+    }
+
+}

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

@@ -5,6 +5,7 @@ import android.view.View
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.Observer
+import androidx.recyclerview.widget.DiffUtil
 import androidx.recyclerview.widget.DividerItemDecoration
 import androidx.recyclerview.widget.LinearLayoutManager
 import io.legado.app.App
@@ -86,7 +87,10 @@ class BooksFragment : VMBaseFragment<BooksViewModel>(R.layout.fragment_books),
         bookshelfLiveData?.observe(
             this,
             Observer {
+                val diffResult =
+                    DiffUtil.calculateDiff(BooksDiffCallBack(booksAdapter.getItems(), it))
                 booksAdapter.setItems(it)
+                diffResult.dispatchUpdatesTo(booksAdapter)
             })
     }