Q:

realm android delete all data

mRealm.beginTransaction();
mRealm.clear(AboutItemRealm.class);
mRealm.clear(AgendaItemRealm.class);
mRealm.clear(AttendeesItemRealm.class);
mRealm.clear(DocumentsItemRealm.class);
mRealm.clear(FAQsItemRealm.class);
mRealm.clear(GalleryItemRealm.class);
mRealm.clear(GoodToKnowItemRealm.class);
mRealm.clear(MultiEventItemRealm.class);
mRealm.clear(ReservationItemRealm.class);
mRealm.clear(SingleEventItemRealm.class);
mRealm.clear(SpeakerItemRealm.class);
mRealm.commitTransaction();
mRealm.close();

When i logout from app i need to clear data of realm for that i have to clear every class like this so is there any way to delete all data of realm without having to write all this mRealm.clear(ClassName.class) for every structure?

A:

The right way of deleting your entire Realm (schema) is to use :
Realm realm = Realm.getDefaultInstance();
realm.beginTransaction();

// delete all realm objects
realm.deleteAll();

//commit realm changes
realm.commitTransaction();

Please be aware, that this will delete all realm object that extends RealmObject class.
Original answer here
For updated realm transaction format
realm.executeTransaction(new Realm.Transaction() {
        @Override
        public void execute(Realm realm) {
            realm.deleteAll();
        }
    });

