使用Parceler保存Android Activity或Fragment状态

Question

我正在使用parceler库。我用这个做了一个复杂的物体。正如它所说，它使对象可打包，所以我想用它来保存片段状态。

这是我的模型

@Parcel
public class Example {
    String name;
    int age;
    public Example() {}
    public Example(int age, String name) {
        this.age = age;
        this.name = name;
    }
    public String getName() { return name; }
    public int getAge() { return age; }
}

在我的片段中，我有这个

   ArrayList<Example> exampletLists;

但是当我想把它放在onSaveInstanceState

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putParcelableArrayList("EXAMPLE_LIST",exampletLists); //this is what I want to do , but I can't 
}

我想在onCreate Like中获取值

 if (savedInstanceState != null) {
    exampletLists = savedInstanceState.getParcelableArrayList(EXAMPLE_LIST);
 }

如何使用这个库实现这一点?

Answer 1

Parceler可以包装数组列表，所以你可以在写入和读取savedInstanceState:

时使用Parcels.wrap()和Parcels.unwrap()方法

public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putParcelable("EXAMPLE_LIST", Parcels.wrap(exampletLists));
}
public void onCreate(Bundle savedInstanceState) {
    //...
    if (savedInstanceState != null) {
        exampletLists = Parcels.unwrap(savedInstanceState.getParcelable(EXAMPLE_LIST));
    }
}