Android Retrofit 是否在主线程上进行网络调用？
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Does Retrofit make network calls on main thread?
提问by Jaguar
I am trying to explore Retrofit+OkHttp on Android. Here's some code I found online :
我正在尝试在 Android 上探索 Retrofit+OkHttp。这是我在网上找到的一些代码：
RestAdapter restAdapter = new RestAdapter.Builder().setExecutors(executor, executor)
.setClient(new OkClient(okHttpClient))
.setServer("blah").toString())
.build();
If I don't use executor service, will my code be running on the main thread ? Should I make web requests in a new thread hence ?
如果我不使用 executor 服务，我的代码会在主线程上运行吗？因此，我应该在新线程中发出 Web 请求吗？
采纳答案by Martin Cazares
The method that return a value does it Synchronously.
返回值的方法是同步进行的。
@GET("/user/{id}/asset")
Asset getUserAsset(@Path("id") int id);
To do it Asynchronous all you need is to add a Callback.
要做到异步，您只需要添加一个回调。
@GET("/user/{id}/asset")
void getUserAsset(@Path("id") int id, Callback<Asset> cb);
Hope this Helps.
希望这可以帮助。
Regards!
问候！
回答by Jake Wharton
Retrofit methods can be declared for either synchronous or asynchronous execution.
可以为同步或异步执行声明改造方法。
A method with a return type will be executed synchronously.
具有返回类型的方法将同步执行。
@GET("/user/{id}/photo")
Photo getUserPhoto(@Path("id") int id);
Asynchronous execution requires the last parameter of the method be a Callback.
异步执行要求方法的最后一个参数是 a Callback。
@GET("/user/{id}/photo")
void getUserPhoto(@Path("id") int id, Callback<Photo> cb);
On Android, callbacks will be executed on the main thread. For desktop applications callbacks will happen on the same thread that executed the HTTP request.
在 Android 上，回调将在主线程上执行。对于桌面应用程序，回调将发生在执行 HTTP 请求的同一线程上。
Retrofit also integrates RxJava to support methods with a return type of rx.Observable
Retrofit 还集成了 RxJava 以支持返回类型为 rx.Observable
@GET("/user/{id}/photo")
Observable<Photo> getUserPhoto(@Path("id") int id);
Observable requests are subscribed asynchronously and observed on the same thread that executed the HTTP request. To observe on a different thread (e.g. Android's main thread) call observeOn(Scheduler)on the returned Observable.
可观察请求是异步订阅的，并在执行 HTTP 请求的同一线程上观察。要在不同的线程（例如 Android 的主线程）observeOn(Scheduler)上观察返回的Observable.
Note: The RxJava integration is experimental.
注意：RxJava 集成是实验性的。
