优化

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

@@ -119,8 +119,11 @@ class ImportBookActivity : VMBaseActivity<ImportBookViewModel>(R.layout.activity
     }
 
     private fun upRootDoc() {
-        AppConfig.importBookPath?.let { lastPath ->
+        val lastPath = AppConfig.importBookPath
         when {
+            lastPath.isNullOrEmpty() -> {
+                FilePicker.selectFolder(this, requestCodeSelectFolder)
+            }
             lastPath.isContentPath() -> {
                 val rootUri = Uri.parse(lastPath)
                 rootDoc = DocumentFile.fromTreeUri(this, rootUri)
@@ -130,8 +133,7 @@ class ImportBookActivity : VMBaseActivity<ImportBookViewModel>(R.layout.activity
             Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q -> {
                 FilePicker.selectFolder(this, requestCodeSelectFolder)
             }
-                lastPath.isNotBlank() -> {
-                    PermissionsCompat.Builder(this)
+            else -> PermissionsCompat.Builder(this)
                 .addPermissions(*Permissions.Group.STORAGE)
                 .rationale(R.string.tip_perm_request_storage)
                 .onGranted {
@@ -142,9 +144,6 @@ class ImportBookActivity : VMBaseActivity<ImportBookViewModel>(R.layout.activity
                 }
                 .request()
         }
-                else -> FilePicker.selectFolder(this, requestCodeSelectFolder)
-            }
-        }
     }
 
     @SuppressLint("SetTextI18n")