When an asynchronous task is executed, the task goes through 4 steps:

十年的南昌网站建设经验，针对设计、前端、开发、售后、文案、推广等六对一服务，响应快，48小时及时工作处理。成都营销网站建设的优势是能够根据用户设备显示端的尺寸不同，自动调整南昌建站的显示方式，使网站能够适用不同显示终端，在浏览器中调整网站的宽度，无论在任何一种浏览器上浏览网站，都能展现优雅布局与设计，从而大程度地提升浏览体验。创新互联从事“南昌网站设计”,“南昌网站推广”以来，每个客户项目都认真落实执行。

1. onPreExecute(), invoked on the UI thread before the task   is executed. This step is normally used to setup the task, for instance by   showing a progress bar in the user interface.

2. doInBackground(Params...), invoked on the background thread   immediately after onPreExecute() finishes executing. This step is used   to perform background computation that can take a long time. The parameters   of the asynchronous task are passed to this step. The result of the computation must   be returned by this step and will be passed back to the last step. This step   can also use publishProgress(Progress...) to publish one or more units   of progress. These values are published on the UI thread, in the    onProgressUpdate(Progress...) step.

3. onProgressUpdate(Progress...), invoked on the UI thread after a   call to publishProgress(Progress...). The timing of the execution is   undefined. This method is used to display any form of progress in the user   interface while the background computation is still executing. For instance,   it can be used to animate a progress bar or show logs in a text field.

4. onPostExecute(Result), invoked on the UI thread after the background   computation finishes. The result of the background computation is passed to   this step as a parameter.

当在主线程中调用new MyTask().execute(args)时，触发

execute（）将参数传给doInBackground（）

doInBackground（）返回值传给onPostExecute()

在doInBackground()中调用的publishProgress()的参数，传递给onProgressUpdate()

另外有需要云服务器可以了解下创新互联scvps.cn，海内外云服务器15元起步，三天无理由+7*72小时售后在线，公司持有idc许可证，提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案，具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势，专为企业上云打造定制，能够满足用户丰富、多元化的应用场景需求。

名称栏目：多线程——AsyncTask类的使用（一）-创新互联
路径分享：http://ybzwz.com/article/dspicd.html