Saving Android Activity or Fragment state using Parceler

Question

I am using parceler library . I have made an complex object with this . As it says it makes the object parcelable , so I want to use it for saving fragment state .

Here is my model

@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; }
}

And in my fragment I have this

   ArrayList<Example> exampletLists;

But when I try to put it in 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 
}

And I want to get the value in onCreate Like

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

How can I achieve this with this libray ?

Answer 1

Parceler can wrap ArrayLists, so what you can do is use the Parcels.wrap() and Parcels.unwrap() methods when writing and reading your `savedInstanceState:

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));
    }
}