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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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清单管理
应用背景这个项目的目标是开发一个在线销售和库存管理系统(模拟人生)百货商店。该系统可用于存储详细信息库存,更新库存的基础上的销售细节,产生的收益销售,产生销售和库存报告等,这是一个集成的系统,包含用户组件(使用销售人员,销售经理、库存管理者等)及管理组件(使用管理员执行管理级别的功能,如添加新的项目库存,改变一个项目的价格等)。关键技术建议的系统包括完整的在线数据输入与现场参考在线验证检查。这个系统的目标是把工作量降到提高效率和加快活动的速度。主要活动在线销售和库存管理系统是提供在线交流系统之间的用户。自动生成的电子邮件尽快库存经理或销售人员或销售经理需要发送邮件对于管理员来说,模仿 ;如果有任何问题发生,由于他们工作。和公司;及;及;及;其他优点:和公司的;和;和1年;以及在中。可用性信息立即数据捕获后,并进行数据捕获;2。综合标准化关系数据库将保持为进程。和公司的;和;和3年;以及在中。任何一代的预先定义查询具体询价。系统目标网上销售的目标和库存管理系统是提供更好的优化和成本该系统的用户减少。
- 2022-07-05 01:18:41下载
- 积分:1
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JSP输出验证码
JSP输出验证码,有登陆示列,可以直接拿来用,很不错的
- 2023-06-24 10:05:04下载
- 积分:1
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android 自定义Toast颜色 实例源码
android 自定义Toast颜色 实例源码
- 2014-08-21下载
- 积分:1
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信息发布系统
能实现信息的添加,修改,删除等一些功能。
- 2022-12-23 22:55:03下载
- 积分:1
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JsptoExcel
jsp页面中的数据导出到excel文件的方法集合(jsp page export data to excel file collection)
- 2012-12-04 09:30:49下载
- 积分:1
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tushuguanli
说明: An Android library management system directly connected to mysql. Unfortunately, there are only Android clients. The author did not export the database to the client. Friends interested in and based on MySQL can create a new MySQL database according to the table and field names in the DBUtil. Java class.
- 2020-06-24 11:20:02下载
- 积分:1
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SnakeGames
贪吃蛇游戏,希望大家不要看源码,自行研究(Snake game, I hope you do not look at the source code, self study.)
- 2018-04-20 17:07:32下载
- 积分:1
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java代码贪食蛇
java版 贪吃蛇小游戏 完整源码 (测试100%无误)。这是一个简单的贪吃蛇游戏,浅显易懂,供学习参考。用到了java中的线程,事件。... 这是一个简单的贪吃蛇游戏,浅显易懂,供学习参考。用到了java中的线程。
- 2022-06-18 01:51:50下载
- 积分:1
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魔幻粒子特效
说明: HTML webpage special effects, mouse pointer special effects, put in the host can be used, simple operation, can make the page more beautiful
- 2020-06-14 22:17:31下载
- 积分:1