Java OnRestoreInstanceState在旋转后返回null

当我在listView中键入某个内容，然后进行旋转时，listView将返回null，而不是我键入的文本。你能解释一下为什么会这样吗

override fun onRestoreInstanceState(savedInstanceState: Bundle?) {
        super.onRestoreInstanceState(savedInstanceState)
        Log.i("ToDoList","OnRestoreInstanceState was called")

        val listSave = savedInstanceState?.getStringArrayList("list")
        this.list.clear()
        this.list.add(listSave.toString())

        adapter = ArrayAdapter <String> (this, android.R.layout.simple_list_item_1,list)
        toDoList.adapter = adapter
    }
override fun onSaveInstanceState(outState: Bundle?, outPersistentState: PersistableBundle?) {
        super.onSaveInstanceState(outState, outPersistentState)
        Log.i("ToDoList","OnSaveInstanceState was called")
        outState?.putStringArrayList("list", list)
    }

覆盖恢复安装状态（savedInstanceState:Bundle？）{
super.onRestoreInstanceState（savedInstanceState）
Log.i（“ToDoList”，“调用OnRestoreInstanceState”）
val listSave=savedInstanceState？.getStringArrayList（“列表”）
this.list.clear（）
this.list.add（listSave.toString（））
adapter=ArrayAdapter（这是android.R.layout.simple\u list\u item\u 1，list）
toDoList.adapter=适配器
}
覆盖SaveInstanceState（超出状态：Bundle？，OutpersistInstantState:PersistableBundle？）{
super.onSaveInstanceState（outState、outPersistentState）
Log.i（“ToDoList”，“调用OnSaveInstanceState”）
超出状态？.putStringArrayList（“列表”，列表）
}

根本原因：您重写了错误的

onSaveInstanceState（）

方法

解决方案：您必须覆盖而不是

从更改代码

override fun onSaveInstanceState(outState: Bundle?, outPersistentState: PersistableBundle?) {
    super.onSaveInstanceState(outState, outPersistentState)
    Log.i("ToDoList","OnSaveInstanceState was called")
    outState?.putStringArrayList("list", list)
}

到

---

根本原因：您重写了错误的

onSaveInstanceState（）

方法

解决方案：您必须覆盖而不是

从更改代码

override fun onSaveInstanceState(outState: Bundle?, outPersistentState: PersistableBundle?) {
    super.onSaveInstanceState(outState, outPersistentState)
    Log.i("ToDoList","OnSaveInstanceState was called")
    outState?.putStringArrayList("list", list)
}

到

---

看看这个问题：。我猜，您的状态没有保存，因为该方法没有被操作系统调用。我并没有检查过这个问题：。我猜，您的状态没有保存，因为操作系统没有调用该方法。我并没有检查