优化

app/src/main/java/io/legado/app/ui/book/source/manage/BookSourceActivity.kt

@@ -349,11 +349,7 @@ class BookSourceActivity : VMBaseActivity<ActivityBookSourceBinding, BookSourceV
             R.id.menu_export_selection -> viewModel.saveToFile(adapter.selection) { file ->
                 exportDir.launch {
                     mode = HandleFileContract.EXPORT
-                    fileData = Triple(
+                    fileData = Triple("bookSource.json", file, "application/json")
-                        "bookSource.json",
-                        file.readBytes(),
-                        "application/json"
-                    )
                 }
             }
         }

app/src/main/java/io/legado/app/ui/document/HandleFileContract.kt

@@ -55,7 +55,7 @@ class HandleFileContract :
         var title: String? = null,
         var allowExtensions: Array<String> = arrayOf(),
         var otherActions: ArrayList<SelectItem<Int>>? = null,
-        var fileData: Triple<String, ByteArray, String>? = null,
+        var fileData: Triple<String, Any, String>? = null,
         var requestCode: Int = 0
     )