How to use calendar type in realm

Question

I am creating a model where i'm trying to store gregorian calendar value in a column, but its showing me error, Calendar Datatype not supported by realmProxcy.

private String alarmName;
private Boolean alarmActive = true;
private Date alarmTime;
private String alarmTonePath = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM).toString();
private Boolean alarmVibrate = true;
private  Calendar cal;

@PrimaryKey public int alarmid;

Error:(30, 8) error: Type 'java.util.Calendar' of field 'cal' is not supported how can i store this calendar value and fetch it

Answer 1

If you really need to store a Calendar instance, you can take advantage of it being a Serializable and the possibility of storing byte[] arrays in Realm objects - serialize your Calendar to byte array for storage and deserialize from byte array when accessing data.

Your object would look like this:

class MyRealmObject extends RealmObject {
    private String alarmName;
    private Boolean alarmActive = true;
    private Date alarmTime;
    private String alarmTonePath = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM).toString();
    private Boolean alarmVibrate = true;
    private byte[] serializedCalendar;

    public Calendar getCalendar() {
        return deserializeCalendar(serializedCalendar);
    }

    public void setCalendar(Calendar calendar) {
        this.serializedCalendar = serializeCalendar(calendar);
    }
}

Refer to this answer on Object<>byte[]serialization/deserialization on how to implement methods:

byte[] serializeCalendar(Calendar c);
Calendar deserializeCalendar(byte[] arr);