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Android APIs
public interface

Parcelable

android.os.Parcelable
Known Indirect Subclasses

Class Overview

Interface for classes whose instances can be written to and restored from a Parcel . Classes implementing the Parcelable interface must also have a static field called CREATOR , which is an object implementing the Parcelable.Creator interface.

A typical implementation of Parcelable is:

       public class MyParcelable implements Parcelable {
     private int mData;

     public int describeContents() {
         return 0;
     }

     public void writeToParcel(Parcel out, int flags) {
         out.writeInt(mData);
     }

     public static final Parcelable.Creator<MyParcelable> CREATOR
             = new Parcelable.Creator<MyParcelable>() {
         public MyParcelable createFromParcel(Parcel in) {
             return new MyParcelable(in);
         }

         public MyParcelable[] newArray(int size) {
             return new MyParcelable[size];
         }
     };
     
     private MyParcelable(Parcel in) {
         mData = in.readInt();
     }
 }
      

Summary

Nested Classes
interface Parcelable.ClassLoaderCreator <T> Specialization of Parcelable.Creator that allows you to receive the ClassLoader the object is being created in. 
interface Parcelable.Creator <T> Interface that must be implemented and provided as a public CREATOR field that generates instances of your Parcelable class from a Parcel. 
Constants
int CONTENTS_FILE_DESCRIPTOR Bit masks for use with describeContents() : each bit represents a kind of object considered to have potential special significance when marshalled.
int PARCELABLE_WRITE_RETURN_VALUE Flag for use with writeToParcel(Parcel, int) : the object being written is a return value, that is the result of a function such as " Parcelable someFunction() ", " void someFunction(out Parcelable) ", or " void someFunction(inout Parcelable) ".
Public Methods
abstract int describeContents ()
Describe the kinds of special objects contained in this Parcelable's marshalled representation.
abstract void writeToParcel ( Parcel dest, int flags)
Flatten this object in to a Parcel.

Constants

public static final int CONTENTS_FILE_DESCRIPTOR

Added in API level 1

Bit masks for use with describeContents() : each bit represents a kind of object considered to have potential special significance when marshalled.

Constant Value: 1 (0x00000001)

public static final int PARCELABLE_WRITE_RETURN_VALUE

Added in API level 1

Flag for use with writeToParcel(Parcel, int) : the object being written is a return value, that is the result of a function such as " Parcelable someFunction() ", " void someFunction(out Parcelable) ", or " void someFunction(inout Parcelable) ". Some implementations may want to release resources at this point.

Constant Value: 1 (0x00000001)

Public Methods

public abstract int describeContents ()

Added in API level 1

Describe the kinds of special objects contained in this Parcelable's marshalled representation.

Returns
  • a bitmask indicating the set of special object types marshalled by the Parcelable.

public abstract void writeToParcel ( Parcel dest, int flags)

Added in API level 1

Flatten this object in to a Parcel.

Parameters
dest The Parcel in which the object should be written.
flags Additional flags about how the object should be written. May be 0 or PARCELABLE_WRITE_RETURN_VALUE .