package com.example;

public class Foo implements Parcelable {

    //...fields, getter/setters, etc.

    @Override
    public void writeToParcel(....) {
    }

    public static final Parcelable.Creator<T> CREATOR = new ... {
        public T createFromParcel() {...}
        public T[] newArray(int size) {....}
    }
}

package com.example.pure;

public class Foo {
    // ... fields , getters/setters, etc.
}

package com.example;

public class Foo extends com.example.pure.Foo implements Parcelable {
    // all the Parcelable implementation goes here.
}