优化

app/src/main/java/io/legado/app/ui/book/local/ImportBookActivity.kt

@@ -235,21 +235,27 @@ class ImportBookActivity : VMBaseActivity<ImportBookViewModel>(R.layout.activity
      * 扫描当前文件夹
      */
     private fun scanFolder() {
-        rootDoc?.let { doc ->
-            adapter.clearItems()
-            val lastDoc = subDocs.lastOrNull() ?: doc
-            viewModel.scanDoc(lastDoc) {
-                adapter.addItem(it)
-            }
-        } ?: let {
-            val lastPath = AppConfig.importBookPath
-            if (lastPath.isNullOrEmpty()) {
-                toast(R.string.empty_msg_import_book)
-            } else {
+        launch(IO) {
+            rootDoc?.let { doc ->
                 adapter.clearItems()
-                val file = File(path)
-                viewModel.scanFile(file) {
-                    adapter.addItem(it)
+                val lastDoc = subDocs.lastOrNull() ?: doc
+                viewModel.scanDoc(lastDoc) {
+                    launch {
+                        adapter.addItem(it)
+                    }
+                }
+            } ?: let {
+                val lastPath = AppConfig.importBookPath
+                if (lastPath.isNullOrEmpty()) {
+                    toast(R.string.empty_msg_import_book)
+                } else {
+                    adapter.clearItems()
+                    val file = File(path)
+                    viewModel.scanFile(file) {
+                        launch {
+                            adapter.addItem(it)
+                        }
+                    }
                 }
             }
         }

app/src/main/java/io/legado/app/ui/book/local/ImportBookViewModel.kt

@@ -34,40 +34,36 @@ class ImportBookViewModel(application: Application) : BaseViewModel(application)
     }
 
     fun scanDoc(documentFile: DocumentFile, find: (docItem: DocItem) -> Unit) {
-        execute {
-            val docList = DocumentUtils.listFiles(context, documentFile.uri)
-            docList.forEach { docItem ->
-                if (docItem.isDir) {
-                    DocumentFile.fromSingleUri(context, docItem.uri)?.let {
-                        scanDoc(it, find)
-                    }
-                } else if (docItem.name.endsWith(".txt", true)
-                    || docItem.name.endsWith(".epub", true)
-                ) {
-                    find(docItem)
+        val docList = DocumentUtils.listFiles(context, documentFile.uri)
+        docList.forEach { docItem ->
+            if (docItem.isDir) {
+                DocumentFile.fromSingleUri(context, docItem.uri)?.let {
+                    scanDoc(it, find)
                 }
+            } else if (docItem.name.endsWith(".txt", true)
+                || docItem.name.endsWith(".epub", true)
+            ) {
+                find(docItem)
             }
         }
     }
 
     fun scanFile(file: File, find: (docItem: DocItem) -> Unit) {
-        execute {
-            file.listFiles()?.forEach {
-                if (it.isDirectory) {
-                    scanFile(it, find)
-                } else if (it.name.endsWith(".txt", true)
-                    || it.name.endsWith(".epub", true)
-                ) {
-                    find(
-                        DocItem(
-                            it.name,
-                            it.extension,
-                            it.length(),
-                            Date(it.lastModified()),
-                            Uri.parse(it.absolutePath)
-                        )
+        file.listFiles()?.forEach {
+            if (it.isDirectory) {
+                scanFile(it, find)
+            } else if (it.name.endsWith(".txt", true)
+                || it.name.endsWith(".epub", true)
+            ) {
+                find(
+                    DocItem(
+                        it.name,
+                        it.extension,
+                        it.length(),
+                        Date(it.lastModified()),
+                        Uri.parse(it.absolutePath)
                     )
-                }
+                )
             }
         }
     }