优化

app/src/main/java/io/legado/app/data/dao/SearchBookDao.kt

@@ -28,6 +28,14 @@ interface SearchBookDao {
     @Query("select * from searchBooks where name = :name and author = :author and origin in (select bookSourceUrl from book_sources where enabled = 1) order by originOrder")
     fun getByNameAuthorEnable(name: String, author: String): List<SearchBook>
 
+    @Query(
+        """select * from searchBooks
+                     where name = :name and author = :author and origin in (select bookSourceUrl from book_sources where enabled = 1)
+                         and coverUrl is not null and coverUrl <> ''
+                     order by originOrder"""
+    )
+    fun getEnableHasCover(name: String, author: String): List<SearchBook>
+
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     fun insert(vararg searchBook: SearchBook): List<Long>
 

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

@@ -66,6 +66,7 @@ class ChangeCoverDialog : DialogFragment(), ChangeCoverViewModel.CallBack {
         recycler_view.layoutManager = GridLayoutManager(requireContext(), 3)
         adapter = CoverAdapter(requireContext())
         recycler_view.adapter = adapter
+        viewModel.initData()
     }
 
     interface CallBack {

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

@@ -3,20 +3,34 @@ package io.legado.app.ui.changecover
 import android.app.Application
 import io.legado.app.App
 import io.legado.app.base.BaseViewModel
+import io.legado.app.help.AppConfig
+import kotlinx.coroutines.asCoroutineDispatcher
+import java.util.concurrent.Executors
 
 class ChangeCoverViewModel(application: Application) : BaseViewModel(application) {
+    private var searchPool =
+        Executors.newFixedThreadPool(AppConfig.threadCount).asCoroutineDispatcher()
     var callBack: CallBack? = null
     var name: String = ""
     var author: String = ""
 
     fun initData() {
         execute {
-            App.db.searchBookDao().getByNameAuthorEnable(name, author).let {
-
+            App.db.searchBookDao().getEnableHasCover(name, author).let {
+                callBack?.adapter?.setItems(it)
             }
         }
     }
 
+    fun search() {
+
+    }
+
+    override fun onCleared() {
+        super.onCleared()
+        searchPool.close()
+    }
+
     interface CallBack {
         var adapter: CoverAdapter
     }

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

@@ -42,7 +42,6 @@ class ChangeSourceViewModel(application: Application) : BaseViewModel(applicatio
         execute {
             callBack?.changeSourceAdapter?.let {
                 val books = searchBooks.toList()
-                books.sorted()
                 val diffResult = DiffUtil.calculateDiff(DiffCallBack(it.getItems(), books))
                 withContext(Main) {
                     synchronized(this) {
@@ -130,12 +129,13 @@ class ChangeSourceViewModel(application: Application) : BaseViewModel(applicatio
         }
     }
 
-    interface CallBack {
-        var changeSourceAdapter: ChangeSourceAdapter
-    }
-
     override fun onCleared() {
         super.onCleared()
         searchPool.close()
     }
+
+    interface CallBack {
+        var changeSourceAdapter: ChangeSourceAdapter
+    }
+
 }