安卓 Realm : Out of memory

Question

使用迭代次数超过3000次的循环:

for (Element e2 : elinks2) {
    AllAuthors allauthor = new AllAuthors();
    allauthor.setUrl_base(href.substring(0, href.length() - 1));
    allauthor.setAuthor_fio(e2.text().trim());
    allauthor.setLetters(e.attr("href"));

    Realm realm_2 = null;
    try {
           realm_2 = Realm.getInstance(new File(func.getFolder("db")), getResources().getString(R.string.app_name_db) + ".realm");
           realm_2.beginTransaction();
           realm_2.copyToRealmOrUpdate(allauthor);
           realm_2.commitTransaction();
    } finally {
           if(realm_2 != null) {
               realm_2.close();
           }
    }
}

添加(或更新)大约 1000 条记录后出现错误

Out of memory in io_realm_internal_SharedGroup.cpp line 164

在线发誓

realm_2.commitTransaction();

什么建议？

AllAuthors.class:

@RealmClass
public class AllAuthors extends RealmObject {

    @PrimaryKey
    private String url_base;

    private String author_fio;

    private String letters;

    ....Standard getters & setters generated....
}

Answer 1

您不断打开和关闭一个 Realm，同时进行大量小额交易。虽然这种模式效率很低，但它本身不应该导致内存不足。但是，如果您在后台线程中运行它，对于每个事务 Realm 都必须维护与原始数据的差异，直到所有线程上的 Realms 都可以更新(这发生在 Looper 事件或调用 Realm.refresh() ).我建议重构为以下内容，这样既更快又占用内存更少:

Realm realm_2 = Realm.getInstance(new File(func.getFolder("db")), getResources().getString(R.string.app_name_db) + ".realm");
realm_2.beginTransaction();
for (Element e2 : elinks2) {
    AllAuthors allauthor = new AllAuthors();
    allauthor.setUrl_base(href.substring(0, href.length() - 1));
    allauthor.setAuthor_fio(e2.text().trim());
    allauthor.setLetters(e.attr("href"));
    realm_2.copyToRealmOrUpdate(allauthor);
}
realm_2.commitTransaction();
realm_2.close();