diff --git a/app/src/main/kotlin/cn/super12138/todo/views/todo/ToDoFragment.kt b/app/src/main/kotlin/cn/super12138/todo/views/todo/ToDoFragment.kt
index 121c771..f6c42f4 100644
--- a/app/src/main/kotlin/cn/super12138/todo/views/todo/ToDoFragment.kt
+++ b/app/src/main/kotlin/cn/super12138/todo/views/todo/ToDoFragment.kt
@@ -84,6 +84,7 @@ class ToDoFragment : Fragment() {
                     .setView(toDoDialogBinding.root)
                     .setPositiveButton(R.string.ok, null)
                     .setNegativeButton(R.string.cancel, null)
+                    .setCancelable(false)
                     .show()
 
                 dialog.getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener {