Android Tutorial => Making a custom object Parcelable.

Example

/**
 * Created by Alex Sullivan on 7/21/16.
 */
public class Foo implements Parcelable
{
    private final int myFirstVariable;
    private final String mySecondVariable;
    private final long myThirdVariable;

    public Foo(int myFirstVariable, String mySecondVariable, long myThirdVariable)
    {
        this.myFirstVariable = myFirstVariable;
        this.mySecondVariable = mySecondVariable;
        this.myThirdVariable = myThirdVariable;
    }
    
    // Note that you MUST read values from the parcel IN THE SAME ORDER that
    // values were WRITTEN to the parcel! This method is our own custom method
    // to instantiate our object from a Parcel. It is used in the Parcelable.Creator variable we declare below.
    public Foo(Parcel in)
    {
        this.myFirstVariable = in.readInt();
        this.mySecondVariable = in.readString();
        this.myThirdVariable = in.readLong();
    }
    
    // The describe contents method can normally return 0. It's used when
    // the parceled object includes a file descriptor.
    @Override
    public int describeContents()
    {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags)
    {
        dest.writeInt(myFirstVariable);
        dest.writeString(mySecondVariable);
        dest.writeLong(myThirdVariable);
    }
    
    // Note that this seemingly random field IS NOT OPTIONAL. The system will
    // look for this variable using reflection in order to instantiate your
    // parceled object when read from an Intent.
    public static final Parcelable.Creator<Foo> CREATOR = new Parcelable.Creator<Foo>()
    {
        // This method is used to actually instantiate our custom object
        // from the Parcel. Convention dictates we make a new constructor that
        // takes the parcel in as its only argument.
        public Foo createFromParcel(Parcel in)
        {
            return new Foo(in);
        }
        
        // This method is used to make an array of your custom object.
        // Declaring a new array with the provided size is usually enough.
        public Foo[] newArray(int size)
        {
            return new Foo[size];
        }
    };
}

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Android Parcelable Making a custom object Parcelable.

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