Why does Android's Bundle API accept ArrayLists rather than Lists

Question

I'm new to Android and while going through a tutorial on saving Activity state to a Bundle, I noticed that instead of accepting the more generic List interface, Bundle's put methods are expecting ArrayLists.

Example:

Bundle.putCharSequenceArrayList(key, value)
Bundle.putIntegerArrayList(key, value)
Bundle.putParcelableArrayList(key, value)
Bundle.putStringArrayList(key, value)

Most of us are familiar with item 52 of Effective Java suggesting that objects must be refered to by their interface, so I am wondering what was the reason behind this API decision.

Is ArrayList perhaps the preferred list implementation in Android?

Answer 1

Just a guess: Maybe Bundele-content must be be serializable and not every Lists implementation is serializable.

From sdk-doc public Bundle.Bundle (ClassLoader)

 Constructs a new, empty Bundle that uses a specific 
 ClassLoader for instantiating Parcelable and Serializable objects.

• jramoyo: makes sense! i'll wait a while more in case someone has a definitive answer.
• jramoyo: the more I go through the tutorial, the more this answer makes sense. so I am accepting it :-)