How can I make my custom objects Parcelable?

Question

I'm trying to make my objects Parcelable. However, I have custom objects and those objects have ArrayList attributes of other custom objects I have made.

What would be the best way to do this?

Answer 1

You can find some examples of this here, here (code is taken here), and here.

You can create a POJO class for this, but you need to add some extra code to make it Parcelable. Have a look at the implementation.

public class Student implements Parcelable{         private String id;         private String name;         private String grade;          // Constructor         public Student(String id, String name, String grade){             this.id = id;             this.name = name;             this.grade = grade;        }        // Getter and setter methods        .........        .........         // Parcelling part        public Student(Parcel in){            String[] data = new String[3];             in.readStringArray(data);            // the order needs to be the same as in writeToParcel() method            this.id = data[0];            this.name = data[1];            this.grade = data[2];        }         @Оverride        public int describeContents(){            return 0;        }         @Override        public void writeToParcel(Parcel dest, int flags) {            dest.writeStringArray(new String[] {this.id,                                                this.name,                                                this.grade});        }        public static final Parcelable.Creator CREATOR = new Parcelable.Creator() {            public Student createFromParcel(Parcel in) {                return new Student(in);             }             public Student[] newArray(int size) {                return new Student[size];            }        };    } 

Once you have created this class, you can easily pass objects of this class through the Intent like this, and recover this object in the target activity.

intent.putExtra("student", new Student("1","Mike","6")); 

Here, the student is the key which you would require to unparcel the data from the bundle.

Bundle data = getIntent().getExtras(); Student student = (Student) data.getParcelable("student"); 

This example shows only String types. But, you can parcel any kind of data you want. Try it out.

EDIT: Another example, suggested by Rukmal Dias.