android - How to create Parcelable code for object that contains GregorianCalendar -

android - How to create Parcelable code for object that contains GregorianCalendar -

i haven't understood how create code needed implement correctly parcelable object contains gregoriancalendar objects.

e.g. object user contains string name; , gregoriancalendar creationdate;, effort this:

@override public int describecontents() { homecoming 0; } @override public void writetoparcel(parcel dest, int flags) { dest.writestring(this.name); dest.writeparcelable(this.creationdate, flags); } private user(parcel in) { this.name = in.readstring(); this.creationdate = in.readparcelable(gregoriancalendar.class.getclassloader()); } public static final creator<user> creator = new creator<user>() { public user createfromparcel(parcel source) { homecoming new user(source); } public user[] newarray(int size) { homecoming new user[size]; } };

that unfortunately doesn't work

in writetoparcel() @ line

dest.writeparcelable(this.creationdate, flags);

get writeparcelable cannot applied gregoriancalendar error

in

this.creationdate = in.readparcelable(gregoriancalendar.class.getclassloader());

get incompatible types error

how code correctly parcelable?

edit

i have tried code generators utilize different ways , i'm not sure right implementation, first 1 utilize writevalue , readvalue in way:

@override public void writetoparcel(parcel dest, int flags) { dest.writestring(name); dest.writevalue(creationdate); } protected user(parcel in) { name = in.readstring(); creationdate = (gregoriancalendar) in.readvalue(gregoriancalendar.class.getclassloader()); }

the sec 1 use

@override public void writetoparcel(parcel dest, int flags) { dest.writestring(name); dest.writeserializable(creationdate); } protected user(parcel in) { name = in.readstring(); creationdate = (gregoriancalendar) in.readserializable(); }

what right way?

you utilize sec way since gregoriancalendar implements serializable, , parcelable work.

@override public void writetoparcel(parcel dest, int flags) { dest.writestring(name); dest.writeserializable(creationdate); } protected user(parcel in) { name = in.readstring(); creationdate = (gregoriancalendar) in.readserializable(); }

however you must not serialize gregoriancalendar, because updates in gregoriancalendar related class can cause issue. consider case load file contains gregoriancalendar objects created different api version, difference in gregoriancalendar implementation lead sure errors, plenty little difference in serialversionuid costant prevent right load of file.

use long parameters store millisecond of date, if don't want rewrite whole application can create couple of methods convert millis gregoriancalendar , vice-versa need.

android parcelable parcel