java.lang.IllegalStateException: Cannot execute task: the task has already been executed (a task can be executed only once)

在使用AsyncTask的时候，收到了如下的错误信息：

ERROR/AndroidRuntime(1936): FATAL EXCEPTION: main
ERROR/AndroidRuntime(1936): java.lang.IllegalStateException: Cannot execute task: the task has already been executed (a task can be executed only once)

查了一下文档，才了解到AsyncTask不可以复用。The task can be executed only once (an exception will be thrown if a second execution is attempted.)
AsyncTask文档链接AsyncTask。关键信息摘抄如下：

Threading rules

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There are a few threading rules that must be followed for this class to work properly:

• The AsyncTask class must be loaded on the UI thread. This is done automatically as of JELLY_BEAN.
• The task instance must be created on the UI thread.
• execute(Params...) must be invoked on the UI thread.
• Do not call onPreExecute(), onPostExecute(Result), doInBackground(Params...), onProgressUpdate(Progress...) manually.
• The task can be executed only once (an exception will be thrown if a second execution is attempted.)