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android 异步 执行 任务 例子 附讲解
Rules::The AsyncTask instance must be created in UI thread. .execute must be invoked on the UI thread.Never call objMyTask.onPreExecute(), objMyTask.doInBackground(), objMyTask.onProgressUpdate(), objMyTask.onPostExecute manually.The AsyncTask can be executed only once (an exception will be thrown if a second execution is attempted.)AsyncTask have Four Main Method... onPreExecute() doInBackground() onProgressUpdate() onPostExecute() onPreExecute-This method is called first when you start AsyncTask using objAsync.execute().And mostly this method is use for initializing dialog(ProgressDialog,CustomDialog) and showing. doInBackground-The main purpose of AsyncTask is accomplished by this method.Any non-UI thread process is running in this method.Such as Rss Feed Reader,Image and video Uploading and Downloading.You cant handle your View in this method.Because this method is non-UI thread.While any background process is running if you want to handle UI therea are onProgressUpdate method. after completion of process this method send result to OnPostExecute. onProgressUpdate-While backgrounding task is running ,you can handle your UI using this method .Such as status of downloading or uploading task.and this method is called from doInBackground.Using publishProgress() you can call onProgressUpdate method to update UI while process is running. onPostExecute -This method is called after the background computation finishes.The result of background process in passed in this method as parameters.And now you can dismiss progress dialog ,to indicate that background task is completed. You can cancel AsyncTask using objAsyncTask.cancel().then you just check in doInBackground, if (isCancelled()) { break; } else { //continue... } See this Image For more Clear.
- 2013-07-05下载
- 积分:1
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bb
说明: 图书馆管理系统,对借阅书籍的管理。能帮助图书馆管理员有效的对图书进行管理(Library Management System)
- 2010-11-17 14:28:52下载
- 积分:1
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ASCII图画分类: 图像处理 可以将鼠标画的图象转成ASCII的形式...
ASCII图画分类: 图像处理 可以将鼠标画的图象转成ASCII的形式-ASCII picture categories : image processing mouse paintings can be transformed into the image in the form of ASC
- 2022-03-23 09:23:57下载
- 积分:1
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Winscock
Socket(套接字)最初是由加利福尼亚大学Berkeley(伯克利)分校为UNIX操作系统开发的网络通信接口,随着UNIX的广泛使用,Socket成为当前最流行的网络通信应用程序接口之一(Socket (socket) was originally developed by the University of California Berkeley (Berkeley) campus for the UNIX operating system, development of network communication interface, with the widespread use of UNIX, Socket become the most popular application programming interface of network communication)
- 2011-08-20 15:55:13下载
- 积分:1
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Pindlebot
说明: 暗黑2 专门 kpbot,早期版本,能用(Diablo 2 special kpbot, early version, can be used)
- 2020-06-18 17:20:01下载
- 积分:1
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2rich.net.rar
2rich.net.rar
- 2023-03-06 09:40:03下载
- 积分:1
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打包软件
用于打包.class 文件路径。 节省开发人员发布部分代码的时候,查找对应的文件
- 2022-10-16 10:00:02下载
- 积分:1
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WifiKill
说明: WiFi kill activity binary
- 2020-01-30 03:09:14下载
- 积分:1
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Java语言开发基于web的学生管理系统,
本资源为小组开发的学生管理系统,B/S架构,基本功能包括学生信息管理,课程信息管理等功能。数据库为mysql 数据库文件被我弄丢了,需要的朋友自己弄下数据库就可以了。
- 2022-02-02 03:39:19下载
- 积分:1
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Calculator
Java下编的计算器小程序,能实现简单的加减乘除功能(Java applet next series of calculators that can achieve a simple arithmetic functions)
- 2013-06-16 15:02:44下载
- 积分:1