Java 如何在AsyncTask doInBackground（）中使用同步对象？

我在后台线程中使用同步对象时遇到问题。我已经在示例中详细说明了问题：

我编写的简单类如下所示：

public class UIThreadClass {

   MyObject object;

   UIThreadClass() {
      object = new MyObject();

      object.doActionOne();
      object.doActionTwo();
  }
}

现在，我的任务是通过将两种方法放到非UI线程来改进代码。 我正在使用异步任务

用于doActionOne（）

问题是:

使用AsyncTask时-如何同步对象以确保 doActionTwo（）总是在doActionOne（）方法之后调用吗

我曾尝试在doInBackground（）中使用synchronized（myObject）{myObject.doActionOne（）；}，但系统警告我myObject只是局部变量，很难保证正确性

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有人能帮我解决这个问题吗？非常感谢

你不需要做任何事情。它们将按照Android文档顺序执行

Order of execution
When first introduced, AsyncTasks were executed serially on a single background thread. Starting with DONUT, this was changed to a pool of threads allowing multiple tasks to operate in parallel. Starting with HONEYCOMB, tasks are executed on a single thread to avoid common application errors caused by parallel execution.

If you truly want parallel execution, you can invoke executeOnExecutor(java.util.concurrent.Executor, Object[]) with THREAD_POOL_EXECUTOR.

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AsyncTask顾名思义，它将异步执行任务，您可以创建一个单独的线程并执行操作并同步它们，而不是使用将同时运行的ThreadPoolExecutor。要了解更多信息，您可以从第一个Asynctask的onPostExecute方法开始第二个Asynctask，或者使用ThreadPoolExecutor。顺便说一句，使用WeakReference的方式不安全，您应该将

wObject.get（）

存储在变量中，然后执行if语句。再次调用

wObject.get（）

可能会在某个时候给出一个空引用。@AkshayKatariya:但我想要的是“如何同步”。问题解决了，谢谢你，谢谢你，伙计，你是对的，这是我的错误，没有清楚地阅读文档。

private static class DoActionTwoTask extends AsyncTask<Void, Void, Void> {

    private WeakReference<MyObject> wObject;

    DoActionOneTask(MyObject object) {
        wObject = new WeakReference<>(object);
    }

    @Override
    protected Void doInBackground(Void... voids) {
       if(wObject.get() != null) {
          MyObject myObject = wObject.get();
          myObject.doActionTwo();
       }

       return null;
    }
}

public class UIThreadClass {

   MyObject object;

   UIThreadClass() {
      object = new MyObject();

      new DoActionOneTask(object).execute();
      new DoActionTwoTask(object).execute();
  }
}

Order of execution
When first introduced, AsyncTasks were executed serially on a single background thread. Starting with DONUT, this was changed to a pool of threads allowing multiple tasks to operate in parallel. Starting with HONEYCOMB, tasks are executed on a single thread to avoid common application errors caused by parallel execution.

If you truly want parallel execution, you can invoke executeOnExecutor(java.util.concurrent.Executor, Object[]) with THREAD_POOL_EXECUTOR.