How to Successfully Pass Data, Including Bitmaps and Lists, Between Activities in Android Using Serializable?

Passing Data Through Intent Using Serializable: Resolving Common Issues

Utilizing Serializable is an approach for passing data between activities in Android applications. However, issues can arise during implementation. Here's how to troubleshoot the most common ones.

Issue:

Serializable implementation is not working for a custom class containing Bitmap.

Solution:

Ensure that Bitmap is serializable by having a custom Bitmap class that implements Serializable or find alternative ways to represent and send it.

Additional Issue:

Passing a list of custom Thumbnail objects through Intent.putExtra fails.

Solution:

Use Bundle.putSerializable instead of Intent.putExtra to pass the serializable list. The Bundle needs to be retrieved using getIntent().getExtras(), and the list can be accessed using getSerializable.

Revised Code:

// Prepare the Bundle
Bundle bundle = new Bundle();
bundle.putSerializable("value", all_thumbs);

// Pass the Bundle to the Intent
intent.putExtras(bundle);

// Retrieve the Bundle in the receiving Activity
Intent intent = this.getIntent();
Bundle bundle = intent.getExtras();

// Retrieve the serializable list
List<Thumbnail> thumbs =
    (List<Thumbnail>) bundle.getSerializable("value");

By using Bundle.putSerializable and retrieving it properly, you can pass a list of serializable objects through an Intent successfully. Always remember to implement the Serializable interface or use a compatible data transfer mechanism when using custom objects.

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