不同的意图服务是否在同一线程上排队？

Question

我有两个意图服务 - IntentServiceA 和 IntentServiceB

它们具有以下 class 定义：

public class FirstService extends IntentService {
  public FirstService() {
      super("first_service");
  }

  @Override
  protected void onHandleIntent(Intent intent) {
      Log.d("chi6rag", "first starts");
      for (long i = 0l; i < 10000000l; i++) {
          if (i == 0l) Log.d("chi6rag", "first started");
      }
      Log.d("chi6rag", "first ends");
  }
}

和

public class SecondService extends IntentService {
  public SecondService() {
      super("second_service");
  }

  @Override
  protected void onHandleIntent(Intent intent) {
      Log.d("chi6rag", "second starts");
      for (long i = 0l; i < 10000000l; i++) {
          if (i == 0l) Log.d("chi6rag", "second started");
      }
      Log.d("chi6rag", "second ends");
  }
}

如果我在 Activity 中执行以下代码：

startService(new Intent(this, IntentServiceA.class)); startService(new Intent(this, IntentServiceB.class));

我在日志中看到以下内容：

D/chi6rag (11734): first starts

D/chi6rag (11734): first started

D/chi6rag (11734): second starts

D/chi6rag (11734): second started

D/chi6rag (11734): first ends

D/chi6rag (11734): second ends

虽然如果有人看到 Intent Service Docs，它清楚地提到它将 one intent at a time 传递给 IntentService

的 onHandleIntent 方法

问题：每个意图服务是否都有单独的工作线程？因为预期的日志是：

D/chi6rag (11734): first starts

D/chi6rag (11734): first started

D/chi6rag (11734): first ends

D/chi6rag (11734): second starts

D/chi6rag (11734): second started

D/chi6rag (11734): second ends

Answer 1

IntentService 执行以下操作：

Creates a default worker thread that executes all intents delivered to onStartCommand() separate from your application's main thread.

Creates a work queue that passes one intent at a time to your onHandleIntent() implementation, so you never have to worry about
multi-threading

Provides a default implementation of onStartCommand() that sends the intent to the work queue and then to your onHandleIntent() implementation.

因为您有多个类扩展表单 IntentService，每个都有自己特定的 onHandleIntent。这些在单独的工作队列中处理。

参见 Extending the Intentservice

Answer 2

查看文档：IntentService

All requests are handled on a single worker thread -- they may take as long as necessary (and will not block the application's main loop), but only one request will be processed at a time.

据我所知，所有请求都将在单个线程上处理 per IntentService。这意味着如果您创建许多 IntentService，则无法保证哪个 IntentService 的线程首先执行。

如果您想运行多个线程或在单个线程中按顺序工作，请尝试将 ExecutorService 与 Executors.newSingleThreadExecutor() 和 runnable 一起玩 ExecutorService Examples

不同的意图服务是否在同一线程上排队？

Are separate intent services queued on the same thread?

android

multithreading

android-intent

android-intentservice