问题描述
我在我的项目中使用了 Retrofit、Gson 和 Realm.我有这个类Example需要Serializable.如果没有 Realm，我会这样写:
I use Retrofit, Gson and Realm in my project.I have this class Examplethat need to be Serializable. Without Realm I'd write it like that :
public class Example implements Serializable {
@SerializationName("users")
private List<String> users
//... getters and setters
}
Realm 开始发挥作用，Example 变为(注意 getter 和 setter 是出于兼容性原因采用这种方式):
Realm comes into play and Example becomes (note that getters and setters are this way for compatibility reasons) :
public class Example extends RealmObject implement Serializable {
@SerializedName("users")
private RealmList<RealmString> users;
public ArrayList<String> getUsers() {
ArrayList<String> array = new ArrayList<>();
for (RealmString rs : users) {
array.add(rs.getValue());
}
return array;
}
public void setUsers(ArrayList<String> users) {
RealmList<RealmString> array = new RealmList<>();
for (String rs : users) {
array.add(new RealmString(rs));
}
this.users = array;
}
}
RealmString 为:
with RealmString being :
public class RealmString extends RealmObject implements Serializable {
private String val;
//Constructors, getter and setter
}
并添加自定义 Gson 类型转换器以使其正确反序列化:
and add a custom Gson type converter for it to be deserialized correctly :
public class RealmStringRealmListConverter implements JsonSerializer<RealmList<RealmString>>,
JsonDeserializer<RealmList<RealmString>> {
@Override
public JsonElement serialize(RealmList<RealmString> src, Type typeOfSrc,
JsonSerializationContext context) {
JsonArray ja = new JsonArray();
for (RealmString tag : src) {
ja.add(tag.getValue());
}
return ja;
}
@Override
public RealmList<RealmString> deserialize(JsonElement json, Type typeOfT,
JsonDeserializationContext context)
throws JsonParseException {
RealmList<RealmString> tags = new RealmList<>();
JsonArray ja = json.getAsJsonArray();
for (JsonElement je : ja) {
if (je.isJsonPrimitive()) {
tags.add(new RealmString(je.getAsString()));
}
}
return tags;
}
}
好的，现在我们开始觉得 Realm 开始对我们的代码产生很大的影响.但这是一个附带问题，主要问题是 Example 不再是可序列化的:RealmList 不是.
Ok so now we're starting to feel that Realm is starting to have to big of an impact over our code. But that's a side problem, the main issue is that Example is no longer Serializable : RealmList isn't.
所以我尝试使 RealmList 成为瞬态并拥有我可以使用 @Ignore 注释的挂起列表，并在序列化后重新创建 RealmList.但 Realm 不接受瞬态.
so I tried to make the RealmList transient and have its pendent List that I can annotate with @Ignore, and recreate the RealmList after serialization. But transient is not accepted by Realm.
现在我觉得有点卡住了，Example 在我的代码的许多部分(它是很多类的成员)中通过意图传递.我不想使用 id 到处查询.
Now I feel a bit stuck, Example is passed through intents in numerous parts of my code (it's a member of a lot of classes). I don't want to use an id and query it everywhere.
我的问题是:
如何更改 ̀ Example` 以允许我执行 new Bundle().putSerializable("test", new Example()); 而不会崩溃.
How can I change ̀ Example` in a way that allows me to do new Bundle().putSerializable("test", new Example()); without crash.
感谢您的帮助！
推荐答案
Serializable 不适用于 RealmList，但您可以使用 Parceler 库并实现 Parcelable打包 RealmObjects(注意:它会将它们变成非托管副本！)
Serializable won't work with RealmList, but you can use Parceler library and implement Parcelable to parcel RealmObjects (note: it will turn them into unmanaged copies!)
@Parcel(implementations = { UserRealmProxy.class },
value = Parcel.Serialization.BEAN,
analyze = { User.class })
public class User extends RealmObject {
// ...
}
compile "org.parceler:parceler-api:1.0.3"
apt "org.parceler:parceler:1.0.3"
/* Copyright 2016 Patrick Löwenstein
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License. */
public class RealmListParcelConverter implements TypeRangeParcelConverter<RealmList<? extends RealmObject>, RealmList<? extends RealmObject>> {
private static final int NULL = -1;
@Override
public void toParcel(RealmList<? extends RealmObject> input, Parcel parcel) {
if (input == null) {
parcel.writeInt(NULL);
} else {
parcel.writeInt(input.size());
for (RealmObject item : input) {
parcel.writeParcelable(Parcels.wrap(item), 0);
}
}
}
@Override
public RealmList fromParcel(Parcel parcel) {
int size = parcel.readInt();
RealmList list = new RealmList();
for (int i=0; i<size; i++) {
Parcelable parcelable = parcel.readParcelable(getClass().getClassLoader());
list.add((RealmObject) Parcels.unwrap(parcelable));
}
return list;
}
}
这篇关于RealmList 序列化问题(Realm/Gson/Intent)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！