java - 检查 Realm 对象是否有任何变化

Question

如果结果中的 realmObject 值发生了变化，有没有办法检测到它？

Account account = mRealmInstance.where(Account.class).equalTo("isLoggedIn", true).findFirst();

account.setName("New Name");

if(account.hasChanged()){ //Is there a realmMethod for this?

}

Answer 1

我假设这就是您要找的东西？

RealmChangeListener<Account> listener = new RealmChangeListener() {
    @Override
    public void onChange(Account account) {
        // changes have been made to Account table
    }
}

Account mAccount;

mAccount = mRealmInstance.where(Account.class).equalTo("isLoggedIn", true).findFirst();
if(mAccount != null) {
    mAccount.addChangeListener(listener);
    //assuming I'm in a transaction here
    mAccount.setName("New Name");
}

...

if(mAccount.isValid()) {
    mAccount.removeAllChangeListeners();
}

尽管我确实认为 RealmChangeListener 会在 Account 表发生更改时激活，而不仅仅是在修改此特定对象时激活。

(编辑:自 Realm 3.1+ 以来， Realm 对象监听器也是细粒度的，因此仅在修改所选帐户时才修改)