asynctask

For example , you can implement the previous example using AsyncTask this way

例如，可以利用AsyncTask来实现上面的那个例子

AsyncTask allows you to perform asynchronous work on your user interface .

异步任务AsyncTask允许以异步的方式对用户界面进行操作。

Naturally , the easiest way to avoid this situation is to use AsyncTask .

当然，避免这种情况最好的办法是使用AsyncTask。

AsyncTask just makes it easier to do both of these things .

AsyncTask类只是把上面的两件事情变得简单了。

Regardless of whether or not you use AsyncTask , always remember these two rules about the single thread model

无论您是否使用AsyncTask，，都要记住单线程模型的两个规则

With AsyncTask , you can really simplify multithreaded code .

有了AsyncTask，您就完全可以简化多线程代码。

Similarly , it returns an ArrayList because that is the third type parameter of the AsyncTask .

类似地，它返回一个ArrayList，因为这是AsyncTask的第三个类型参数。

It is also very important to remember that an AsyncTask instance has to be created on the UI thread and can be executed only once .

同时，AsyncTask实例只能在UI线程中创建且只能执行一次。

To use it , you must subclass AsyncTask and implement the doInBackground () callback method , which runs in a pool of background threads .

要使用异步任务，必须继承AsyncTask类并实现doInBackground（）回调方法，该对象将运行于一个后台线程池中。

Perhaps the best solution , though , is to extend the AsyncTask class , which simplifies the execution of worker thread tasks that need to interact with the UI .

当然，最好的解决方案也许就是继承使用异步任务类AsyncTask，此类简化了一些工作线程和UI交互的操作。