java - 互联网关闭时正在删除数据

Question

我正在使用 realm compile 'io.realm:realm-android:0.82.1' 如果互联网正常，数据将被成功保存和检索。但如果我关闭设备的互联网，它不会返回数据。有人可以提出建议吗？

我已点击此链接了解 Realm 。 https://www.androidhive.info/2016/05/android-working-with-realm-database-replacing-sqlite-core-data/

这是我的应用程序类代码

@Override
public void onCreate() {
    super.onCreate();

    RealmConfiguration realmConfiguration = new RealmConfiguration.Builder(this)
            .name(Realm.DEFAULT_REALM_NAME)
            .schemaVersion(0)
            .deleteRealmIfMigrationNeeded()
            .build();
    Realm.setDefaultConfiguration(realmConfiguration);

下面是 realmcontroller，它配备了一些我用来插入或检索数据的代码

public class RealmController {

private static RealmController instance;
private final Realm realm;

public RealmController(Application application) {
    realm = Realm.getDefaultInstance();
}

public static RealmController with(Fragment fragment) {

    if (instance == null) {
        instance = new RealmController(fragment.getActivity().getApplication());
    }
    return instance;
}

public static RealmController with(Activity activity) {

    if (instance == null) {
        instance = new RealmController(activity.getApplication());
    }
    return instance;
}

public static RealmController with(Application application) {

    if (instance == null) {
        instance = new RealmController(application);
    }
    return instance;
}

public static RealmController getInstance() {

    return instance;
}

public Realm getRealm() {

    return realm;
}

//Refresh the realm istance
public void refresh() {

    realm.refresh();
}

//clear all objects from Book.class
public void clearAll() {

    realm.beginTransaction();
    realm.clear(ServiceModel.class);
    realm.commitTransaction();
}

//find all objects in the Book.class
public RealmResults<ServiceModel> getAllServices() {
    return realm.where(ServiceModel.class).findAll();
}

//query a list of services by category_id
public RealmResults<ServiceModel> getServicesByCategory(String id) {
    return realm.where(ServiceModel.class).equalTo("category_id", id).findAll();
}

//query a list of services by category_id
public ServiceDetailsModel getServiceDetails(String service_id) {
    return realm.where(ServiceDetailsModel.class).equalTo("service_id", service_id).findFirst();
}

//query a list of services by category_id
public void clearServicesByCategory(final String id) {
    realm.executeTransaction(new Realm.Transaction() {
        @Override
        public void execute(Realm realm) {
            RealmResults<ServiceModel> rows = realm.where(ServiceModel.class).equalTo("category_id", id).findAll();
            rows.clear();
        }
    });
}

// save a model in realm
public <M extends RealmObject> void saveModel(M object) {
    realm.beginTransaction();
    realm.copyToRealm(object);
    realm.commitTransaction();
}

//check if Book.class is empty
public boolean hasBooks() {
    return !realm.allObjects(ServiceModel.class).isEmpty();
}

//query example
public RealmResults<ServiceModel> queryedBooks() {

    return realm.where(ServiceModel.class)
            .contains("author", "Author 0")
            .or()
            .contains("title", "Realm")
            .findAll();

}
}

Answer 1

不确定这是否会解决您的问题，但请尝试在设置配置之前添加 Realm.init(this);。