我有以下 RETROFIT API：
@POST("/payments")
Observable<Response> saveCreditCard(@Body CreditCard creditCard)
CreditCard is a RealmObject.
当我尝试使用我的 API 方法时：
CreditCard card = realm.createObject(CreditCard.class);
card.setWhateverField(...);
...
mApi.saveCreditCard(card)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(...);
我收到以下错误：
> retrofit.RetrofitError: com.fasterxml.jackson.databind.JsonMappingException: Realm access from incorrect thread. Realm objects can only be accessed on the thread they where created.
System.err﹕ at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:400)
System.err﹕ at retrofit.RestAdapter$RestHandler.access$100(RestAdapter.java:220)
System.err﹕ at retrofit.RestAdapter$RestHandler$1.invoke(RestAdapter.java:265)
System.err﹕ at retrofit.RxSupport$2.run(RxSupport.java:55)
System.err﹕ at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
System.err﹕ at java.util.concurrent.FutureTask.run(FutureTask.java:237)
System.err﹕ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
System.err﹕ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
System.err﹕ at retrofit.Platform$Android$2$1.run(Platform.java:142)
System.err﹕ at java.lang.Thread.run(Thread.java:818)
System.err﹕ Caused by: java.lang.AssertionError: com.fasterxml.jackson.databind.JsonMappingException: Realm access from incorrect thread. Realm objects can only be accessed on the thread they where created.
我假设 RETROFIT 正在进行序列化JSON on the io()调度程序，因此出现错误。
有人对我如何克服 Realm 的线程问题有任何建议吗？
UPDATE
Realm添加了对使用分离对象的支持realm.copyFromRealm(yourObject, depthLevel)
CreditCard creditCard = realm.createObject(CreditCard.class);
card.setWhateverField(...);
...
final int relationshipsDepthLevel = 0;
creditCard = realm.copyFromRealm(creditCard, relationshipsDepthLevel);
mApi.saveCreditCard(temporaryCard)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(...);
已弃用的答案如下：
我找到了一个需要 2 行额外代码和一个额外序列化步骤的解决方法。
@Inject
ObjectMapper mObjectMapper; // I use Dagger2 for DI
....
CreditCard creditCard = realm.createObject(CreditCard.class);
card.setWhateverField(...);
...
// I use Jackson's ObjectMapper to "copy" the original creditCard
// to a new temporary instance that has not been tied to a Realm.
String json = mObjectMapper.writeValueAsString(creditCard);
PaymentCreditCardDataView temporaryCard = mObjectMapper
.reader(PaymentCreditCardDataView.class)
.readValue(json);
mApi.saveCreditCard(temporaryCard)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(...);
缺点是我在 UI 线程上有一个额外的对象和一个额外的序列化+反序列化步骤。如果我有尺寸合理的物体应该没问题。
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