我可以做一个凌空同步请求？ [英] Can I do a synchronous request with volley?

问题描述

想象一下，我在这已经有一个后台线程服务。我可以做在同一个线程使用凌空一个请求，这样的回调同步发生？

Imagine I'm in a Service that already has a background thread. Can I do a request using volley in that same thread, so that callbacks happen synchronously?

有2方面的原因： - 首先，我并不需要另一个线程，这将是一种浪费创建它。 - 其次，如果我在ServiceIntent，该线程的执行将完成回调之前，并为此我不会有任何的凌空回应。我知道我可以创建自己的服务有一个runloop我可以控制一些线索，但希望有在凌空此功能。

There are 2 reasons for this: - First, I do not need another thread and it would be a waste to create it. - Second, if I'm in a ServiceIntent, the execution of the thread will finish before the callback, and therefor I will have no response from Volley. I know I can create my own Service that has some thread with a runloop I can control, but it would be desirable having this functionality in volley.

感谢您！

推荐答案

它看起来像有可能与排球的 RequestFuture 类。例如，创建一个同步的JSON HTTP GET请求，您可以执行以下操作：

It looks like it is possible with Volley's RequestFuture class. For example, to create a synchronous JSON HTTP GET request, you can do the following:

RequestFuture<JSONObject> future = RequestFuture.newFuture();
JsonObjectRequest request = new JsonObjectRequest(URL, null, future, future);
requestQueue.add(request);

它总是会阻止，你可以使用的Future.get（30 TimeUnit.SECONDS）; 之后，那个时候它会抛出超时异常，而不是无限期地等待

it will always block you can use future.get(30, TimeUnit.SECONDS); after that time it will throw timeout exception rather than waiting indefinitely

try {
  JSONObject response = future.get(); // this will block (forever)
} catch (InterruptedException e) {
  // exception handling
} catch (ExecutionException e) {
  // exception handling
}

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