Android app开发中Retrofit框架的初步上手使用

Platform.Base

@Override Client.Provider defaultClient() {
 final Client client;
 if (hasOkHttpOnClasspath()) {
  client = OkClientInstantiator.instantiate();
 } else {
  client = new UrlConnectionClient();
 }
 return new Client.Provider() {
  @Override public Client get() {
   return client;
  }
 };
}

 Platform.AppEngine

@Override Client.Provider defaultClient() {
 final UrlFetchClient client = new UrlFetchClient();
 return new Client.Provider() {
  @Override public Client get() {
   return client;
  }
 };
}

对于Android，优先使用OKHttp，否则2.3以后使用HttpUrlConnection，2.3以前使用HttpClient

defaultHttpExecutor就是返回一个Executor，执行请求的线程在这个Executor中执行，就做了一件事，把线程设置为后台线程

defaultCallbackExecutor用于执行Callback类型的请求时，提供一个Executor执行Callback的Runnable

Platform.Base

@Override Executor defaultCallbackExecutor() {
  return new Utils.SynchronousExecutor();
}
Platform.Android

@Override Executor defaultCallbackExecutor() {
  return new MainThreadExecutor();
}

SynchronousExecutor

static class SynchronousExecutor implements Executor {
  @Override public void execute(Runnable runnable) {
   runnable.run();
  }
}
								 
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