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  • Parcelable vs Serializable

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    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];
    }
    };
    

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