Question

To send intent with any object from one activity to another activity we can use Parcelable Interface or Serializable Interface. What is the difference between two? Which one is preferable to use?

Moreover, we can send string, integer type of object without using all this Interface. How it is possible?

Answer 1

Java Serializable:
Serializable comes from standard Java and is much easier to implement all you need to do is implement the Serializable interface and add override two methods.

  private void writeObject(java.io.ObjectOutputStream out)
              throws IOException 
  private void readObject(java.io.ObjectInputStream in)
              throws IOException, ClassNotFoundException

The problem with Serializable is that it tries to appropriately handle everything under the sun and uses a lot reflection to make determine the types that are being serialized. So it becomes a beefy Object

Androids Parcelable:
Android Inter-Process Communication (AIPC) file to tell Android how is should marshal and unmarshal your object.It is less generic and doesn’t use reflection so it should have much less overhead and be a lot faster.