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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 指南针app源码(亲测可用)
android 指南针app源码(亲测可用)
- 2019-12-26下载
- 积分:1
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android 图片高斯图片模糊算法
android 图片高斯图片模糊算法
- 2015-06-16下载
- 积分:1
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android 音频通讯库实例源码(含安卓、ios demo)
* 此demo程序属于试用性质程序,仅具备部分功能,其限制如下: * 1. 仅支持部分字符识别。 * 2. 识别若干次后,程序会自动停止识别。若想继续使用,请停止该程序,然后重新启动程序。 * 3. 不支持连续字符传递。 * 4. 不支持自动纠错功能。 * 5. 禁止用于商业用途。 * 网上找的开发库,试了下,可用,但有限制,可用来开发DEMO
- 2015-01-26下载
- 积分:1
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android 实现圆形菜单
private void computeCoordinates() { BigStone stone; BigStone menus; for (int index = 0; index < STONE_COUNT; index ) { stone = mStones[index]; stone.x = mPointX (float) (mRadius * Math.cos(stone.angle * Math.PI / 180)); stone.y = mPointY (float) (mRadius * Math.sin(stone.angle * Math.PI / 180)); } if (flag == 0) { for (int i = 0; i < MENUS; i ) { menus = mMenus[i]; switch (i) { case 0: menus.x = 300 * 1.8f; menus.y = 50; break; case 1: menus.x = 300 * 1.8f 100; menus.y = 50; break; case 2: menus.x = 300 * 1.8f 200; menus.y = 50; break; case 3: menus.x = 300 * 1.8f; menus.y = 150; break; case 4: menus.x = 300 * 1.8f 10 100; menus.y = 250; break; } } } }
- 2014-06-22下载
- 积分:1
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android 计算自己手机的屏幕宽高,density值,px 宽高,dp 的宽高,及px 和dp互转的实例源码下载
android 计算自己手机的屏幕宽高,density值,px 宽高,dp 的宽高,及px 和dp互转的实例源码下载
- 2014-08-31下载
- 积分:1
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疫情信息查询android app源码
【实例简介】
- 2021-09-09 00:31:01下载
- 积分:1
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仿电商后台管理系统源码
【实例简介】仿电商后台管理系统源码
:本系统采用的还layUI模板,基于ssm框架,功能趋于成熟,运行环境:mysql8.0,jdk8.0及以上,IDEA;我做此项目是用来实训结业答辩,项目可流畅运行,毕竟答辩时在领导面前总不能报错吧,若有意外,请亲检查版本,believe me!
- 2021-12-06 00:37:34下载
- 积分:1
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android viewpager 动态加载数据
android 动态加载数据
- 2015-03-16下载
- 积分:1
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android 仪表盘/波浪形进度条控件以及示例源码
android 仪表盘/波浪形进度条控件以及示例源码
- 2018-08-23下载
- 积分:1