fix bookimport bug

app/src/main/java/io/legado/app/ui/book/cache/CacheViewModel.kt

@@ -102,7 +102,7 @@ class CacheViewModel(application: Application) : BaseViewModel(application) {
         val filename = "${getExportFileName(book)}.txt"
         DocumentUtils.delete(doc, filename)
         val bookDoc = DocumentUtils.createFileIfNotExist(doc, filename)
-            ?: throw NoStackTraceException("创建文档失败")
+            ?: throw NoStackTraceException("创建文档失败，请尝试重新设置导出文件夹")
         val stringBuilder = StringBuilder()
         context.contentResolver.openOutputStream(bookDoc.uri, "wa")?.use { bookOs ->
             getAllContents(scope, book) { text, srcList ->

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

@@ -48,10 +48,10 @@ class ImportBookActivity : VMBaseActivity<ActivityImportBookBinding, ImportBookV
         it.uri?.let { uri ->
             if (uri.isContentScheme()) {
                 AppConfig.importBookPath = uri.toString()
-                initRootDoc()
+                initRootDoc(true)
             } else {
                 AppConfig.importBookPath = uri.path
-                initRootDoc()
+                initRootDoc(true)
             }
         }
     }
@@ -146,10 +146,10 @@ class ImportBookActivity : VMBaseActivity<ActivityImportBookBinding, ImportBookV
         }
     }
 
-    private fun initRootDoc() {
+    private fun initRootDoc(changedFolder: Boolean = false) {
         val lastPath = AppConfig.importBookPath
         when {
-            viewModel.rootDoc != null -> upPath()
+            viewModel.rootDoc != null && !changedFolder -> upPath()
             lastPath.isNullOrEmpty() -> {
                 binding.tvEmptyMsg.visible()
                 selectFolder.launch()

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

@@ -4,6 +4,7 @@ import android.app.Application
 import android.net.Uri
 import androidx.documentfile.provider.DocumentFile
 import io.legado.app.base.BaseViewModel
+import io.legado.app.constant.AppLog
 import io.legado.app.constant.AppPattern.bookFileRegex
 import io.legado.app.constant.PreferKey
 import io.legado.app.model.localBook.LocalBook
@@ -76,6 +77,9 @@ class ImportBookViewModel(application: Application) : BaseViewModel(application)
             uriList.forEach {
                 LocalBook.importFile(Uri.parse(it))
             }
+        }.onError {
+            context.toastOnUi("添加书架失败，请尝试重新选择文件夹")
+            AppLog.put("添加书架失败\n${it.localizedMessage}", it)
         }.onFinally {
             finally.invoke()
         }