If we want to send some data over the network or from one place to another place then we have to serialize it first using Serialization in java. Serialization is a process of Marshalling and Unmarshalling of data. Basically the conversion of Objects to bytes called Marshalling and conversion of bytes to original Objects are called Unmarshalling of data.

Example : I have two activities and I want to send an arraylist from one activity to another activity using Intent so how can we pass that arraylist ?

We can use either Serializable or Parcelable to send arraylist of objects.

But which one is better with Android development ?

Serializable and parcelable both are used for marshalling and Unmarshalling of data, But serilaizable is a marker interface we don't have any method to control this process but Parcelable is better than Serializable interface because this provides methods to control marshalling and unmarshalling of data.

A Bean class that holds name and class of student and implements Parcelabler :

private class Bean implements Parcelable{

public String name="";
    public String class="":

public Bean(Parcel source) {
    name = source.readString();
    class = source.readString();
}

public Bean() {
}

@Override
public int describeContents() {
    return this.hashCode();
}

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(name);
    dest.writeString(class);
}

public static final Parcelable.Creator CREATOR = new Parcelable.Creator() {

    public Bean createFromParcel(Parcel in) {

        return new Bean(in);
    }

    public Bean[] newArray(int size) {
        return new Bean[size];
    }
};
}

First activity to send arraylist using intent

   ArrayList<Bean> arraylist = new ArrayList<Bean>();
   for(int i=0;i<20;i++)
 {
      Bean bean = new Bean();
      bean.name = "name" + i;
      bean.class = "class" + i;
      arraylist.add(bean);
 }
  Intent intent = new Intent(FirstActivity.this,SecondActivity.class);
  intent.putParcelableArrayListExtra("key", arraylist);
  startActivity(intent);        

Second activity to get this arraylist from intent

private ArrayList<Bean> parcellist;
parcellist = getIntent().getParcelableArrayListExtra("key");

Note: Process of Masrshalling

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(name);
    dest.writeString(class);
}

Note: Process of Unmarshalling

public static final Parcelable.Creator CREATOR = new Parcelable.Creator() {

public Bean createFromParcel(Parcel in) {

    return new Bean(in);
}

public Bean[] newArray(int size) {
    return new Bean[size];
}
};