How to Properly Pass Serializable Data Between Android Activities?

Passing Data through Intent Using Serializable

Implement serializable to transfer data between Android components. However, if your implementation does not work despite marking your class as serializable, consider the following:

Ensure Proper Serializable Implementation

Your Thumbnail class should correctly implement the Serializable interface with a serialVersionUID. Ensure that all fields in the class are either transient or serializable.

Use Bundle.Serializable for Data Transfer

Instead of directly putting the serializable list into the intent, use Bundle.Serializable to pass it:

Bundle bundle = new Bundle();
bundle.putSerializable("value", all_thumbs);
intent.putExtras(bundle);

Retrieve Serializable Data in Receiving Activity

In the receiving activity, retrieve the serializable list using Bundle:

Intent intent = this.getIntent();
Bundle bundle = intent.getExtras();

List<Thumbnail> thumbs =
               (List<Thumbnail>)bundle.getSerializable("value");

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