CODEWITHSUNDEEP
androidbundlefragment
krisDrOid
krisDrOid

Reputation: 3316

Saving and Restoring Custom Object in fragment

I have two fragments FragmentA and FragmentB. From Fragment A i update Views in Fragment B by passing custom object as a parameter to a method in Fragment B. For example below is the Fragment B:

public class FragmentB extends Fragment {

private ArrayList<String> customObj = new ArrayList<String>();

        public void updateViews(ArrayList<String> obj) {
                customObj = obj;

         }

    @Override
        public void onSaveInstanceState(Bundle outState) {
        System.out.println("Custom Object : "+customObj);//custom object is always  empty
        }

Now, whenever i rotate the screen, the custom object is al;ways empty.

Note Here I am just updating the views of Fragement B. The object is passed as a parameter from Fragment A to the method updateViews of Fragment B. Also, i am not looking forward to define static for custom object.

Upvotes: 0

Views: 4719

Answers (1)

Amit
Amit

Reputation: 13384

You can do two things 1. Store that custom object somewhere which is not created every time orientation is changed i.e. Application class, Service etc. 2. Store that object inside the Bundle which you get as a parameter inside OnSaveInstanceState() and use that Bundle to set the Object in OnRestoreInstanceState() or OnCreate()...

For Example,

@Override
protected void onCreate(Bundle savedInstanceState) {
    Logger.d("Dash onCreate");
    super.onCreate(savedInstanceState);

    ...
    // create fragments to use
    if (savedInstanceState != null) {
       //get your Object
    }
    if (yourObject != null)
        //restore the View using yourObject
    ...
} 

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
}

Now in your Custom Class you will have to either implement Serializable or Parcelable for storing that inside a Bundle. Serialization is simple but if you implement Parcellable you have more control on it.

Some other similar threads on SO related to this topic are

Similar Example

Another good example

You can get a similar Example in Android Documentations for Fragments.

Upvotes: 2

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