android中的方向变化

我正在使用getLastNonConfigurationInstance（）保存对象，同时在活动中更改方向。现在它被弃用了。最好的替代方法是什么？文档中说“使用片段”。但是我需要使用活动。

要保存状态，请使用

onSaveInstanceState（Bundle savedInstanceState）

。您可以在

onCreate

或

onRestoreInstanceState（Bundle savedInstanceState）

中还原保存的状态

基本上是一种存储键值对“映射”的方法， 它将被传递到onCreate和onRestoreInstanceState，其中 您可以提取如下值：

    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
      super.onRestoreInstanceState(savedInstanceState);
      // Restore UI state from the savedInstanceState.
      // This bundle has also been passed to onCreate.
      boolean myBoolean = savedInstanceState.getBoolean("MyBoolean");
      double myDouble = savedInstanceState.getDouble("myDouble");
      int myInt = savedInstanceState.getInt("MyInt");
      String myString = savedInstanceState.getString("MyString");
    }

    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
      super.onRestoreInstanceState(savedInstanceState);
      // Restore UI state from the savedInstanceState.
      // This bundle has also been passed to onCreate.
      boolean myBoolean = savedInstanceState.getBoolean("MyBoolean");
      double myDouble = savedInstanceState.getDouble("myDouble");
      int myInt = savedInstanceState.getInt("MyInt");
      String myString = savedInstanceState.getString("MyString");
    }