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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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android 小学生 课程表
小学生课程表,可以自定义课程,自定义每周课程数目。为了程序的健壮性,程序自动记录异常的信息并mail到设定的邮箱
- 2022-01-25 17:48:11下载
- 积分:1
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jiami_Android
android上实现文本加密解密。基于约瑟夫环出环序列的到一个混沌序列加解密。(android on text encryption and decryption. Josephus ring sequence to a chaotic sequence encryption and decryption. android on text encryption and decryption. Josephus ring sequence to a chaotic sequence encryption and decryption.)
- 2012-09-13 21:38:03下载
- 积分:1
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Android OBD2 App for Bluetooth ELM327
Android OBD2 App for Bluetooth ELM327
车联网的 android端 obd源码, 协议和发送接收指令 ,显示行车电脑里各种数据以及故障码等
- 2022-03-01 18:34:38下载
- 积分:1
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德州扑克手游
风靡欧美的德克萨斯扑克,这是JAVA开发的游戏源码供参考,希望对想开发这游戏的有帮助, 手机游戏德州扑克源码,包括服务器代码+安卓代码+IOS源码不是个人开发的,公司开发的,已经运营上线。The use of java source code developed by Texas poker, board games who want to develop friends, it should be some help
- 2022-06-12 15:43:38下载
- 积分:1
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Android无线点餐系统
基于BS模式,安卓端访问主机的服务器,进行相应的点餐操作,数据库采用mysql,采用jdk1.7,安卓端功能模块包括点餐,换桌,查询,开桌,结算,查账单等功能。
- 2022-03-17 12:05:36下载
- 积分:1
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百度语音识别和合成
整合百度语音识别和语音合成demo,能够将识别后的文本播报出来,在android验证正常识别和播报。
- 2022-05-13 01:31:24下载
- 积分:1
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android日期控件
DatePicker 2.0提供了三个Manager来管理控件的各项功能,其中DPCManager用于对日期数据的加载,这在上面的介绍中有所提及这里不再多说;DPLManager用于对语言环境的控制,DatePicker 2.0内置中文和英语两种语言并会根据当前系统的语言环境进行自动切换,如果你想扩展更多的语言,只需继承DPLManager并重写相关方法即可,同时你还必须在DPLManager的单例方法中增加相关逻辑以便DatePicker能识别你的语言
- 2022-07-22 15:47:13下载
- 积分:1
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学生成绩管理系统
【实例简介】基本实现老师登陆和学生登陆两大功能,其中老师登陆实现7种功能,学生只有四种功能
- 2021-08-07 00:30:57下载
- 积分:1
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KUNUJF
OFDM及其基带FFT实现原理以及OFDM的载波和符号同步问题()
- 2018-02-01 06:56:49下载
- 积分:1